28H4: Tombs County Core, Baxley, GA
Gulf Trough Core
Core Log by
Paul F. Huddlestun
Combined with Weems and Edwards (2001)
Logged 8/12/99 and 3/25/09
Written up 5/09 and 8/09
Reveiwed in Jan/2024
Posted Here 24/April/2024
Baxley NE 7½’ Quadrangle
Based on the latitude, longitude, and elevation of this core site, the location of the site is in the far northeastern section of the USGS Baxley NE quadrangle map, roughly 1.1 miles north-northeast of the jct. of Ga. 147 and Marvin Church Roads, and on the north side of Horace Sanders Rd., 0.6 mile west of the jct. with Ga. 147
Latitude N 31° 59' 52"
Longitude W 82° 16' 27"
Elevation 172 feet
Based on the latitude, longitude, and elevation of this core site, the location of the site is in the far northeastern section of the USGS Baxley NE quadrangle map, roughly 1.1 miles north-northeast of the jct. of Ga. 147 and Marvin Church Roads, and on the north side of Horace Sanders Rd., 0.6 mile west of the jct. with Ga. 147
Latitude N 31° 59' 52"
Longitude W 82° 16' 27"
Elevation 172 feet
Lithostratigraphic
unit and bed number Description Thickness Depth
NO CORE 20.0 0.0
unit and bed number Description Thickness Depth
NO CORE 20.0 0.0
UPPER MIOCENE, TORTONIAN
ALTAMAHA FORMATION - 108 feet
Ebenezer–equivalent?
Pearson terrace unit of Weems and Edwards (2001)
Bed 1 Clay: slightly sandy and micaceous, a trace 4.0 20.0
of very fine dark grains; massive and
structureless; tough, plastic and competent
(100% core recovery); close to yellowish
gray (5Y 7/2); grades downward into:
Bed 2 Clay; very sandy, some dark grains and 4.0 24.0
“sooty” smears; massive and structureless;
tough, hard and competent; yellowish gray
(5Y 7/2) to very light yellowish gray (5Y 8/2);
fairly abruptly grades downward into:
Bed 3 Sandstone: mostly fine to medium grained but 9.0 28.0
some coarse grained sand present; argillaceous;
rudely stratified; hard, tough and competent
but less consolidated below 34.0 feet (100%
core recovery); close to yellowish gray (5Y 8/1);
grades downward into:
Bed 4 Sand; clayey, slightly micaceous; massive 5.0 37.0
bedded and structureless; tough and
moderately to mostly competent (~85% core
recovery); color mottled between 37.0 and
39.0 feet (mottling includes light brown
(5YR 5/6), yellowish gray (5Y 7/2 – 5Y 8/1),
yellowish gray (5Y 8/1) below 39.0 feet;
grades downward into:
Bed 5 Sand: coarse, pebbly and poorly sorted; 7.5 42.0
argillaceous; mostly massive and
structureless except below 47.0 feet where
bedding is inclined; sediment is tough,
coherent and moderately to mostly
competent (~77% core recovery); yellowish
gray (5Y 8/1); abruptly overlies:
Bed 6 Sand; mostly fine to coarse grained, poorly 8.0 49.5
sorted; feldspathic; somewhat argillaceous,
massive and structureless; unconsolidated
but tough and resistant (100% core recovery);
Very coarse sand at 49.0 to 50.0 feet;
Sand is slightly micaceous, fine grained
and well sorted from 50.0 feet to 51.0 feet;
Grades downward by decrease in sand-size
and improvement in sorting into:
Bed 7 Top of Ebenezer Formation, member #5 of Weems and Edwards
(2001) at 57.5 feet
Sand: fine to medium grained and moderately 7.5 57.5
sorted; somewhat argillaceous, a trace of mica;
massive and structureless; unconsolidated
but tough, resistant and competent; yellowish
gray (5Y 7/2); grades downward into:
Bed 8 Sandy clay/clayey sand: quartz sand is fine 2.0 65.0
to medium grained, moderately well sorted;
massive and structureless; tough, resistant
and competent; grades downward into:
Bed 9 Sand: medium to coarse grained in the upper 10.0 67.0
part of the Bed, finer grained below 71 feet;
clayey and micaceous in the lower part of the
Bed; massive and structureless; resistant and
very competent (100% core recovery);
yellowish gray (5Y 7/2) in color; grades
abruptly downward into:
Bed 10 Sandstone: (Altamaha-type sandstone), 2.5 77.0
argillaceous; medium to coarse grained and
moderately sorted; crudely layered and flaggy;
moderately indurated and competent (100%
core recovery); moderate yellowish brown
(10YR 5/4) to light olive gray (5Y 6/1);
grades abruptly downward:
Bed 11 Sand; medium grained and moderately 2.5 79.5
sorted; feldspathic and argillaceous, massive
and structureless; tough coherent and mostly
to moderately competent (~80% core recovery);
abruptly overlies:
Bed 12 Sandstone: (typical Altamaha sandstone), 17.0 82.0
fine to coarse grained and moderately poor
sorting; somewhat argillaceous; crudely
layered, very tough, compact and resistant,
(100% core recovery); color mottled;
moderate brown (5YR 4/4), yellowish gray
(5Y 7/2), dark yellowish brown (10YR 4/2),
moderate yellowish brown (10R 4/6), and
light olive gray (5Y 6/1); grades downward
into:
Bed 13 Sand: medium to coarse grained and poorly 9.0 99.0 sorted; more argillaceous than overlying bed;
crudely layered and less color mottling below
99.0 feet; basal one foot consists of
friable sandstone; tough coherent and
competent; appears to grade abruptly
downward into:
ALTAMAHA FORMATION - 108 feet
Ebenezer–equivalent?
Pearson terrace unit of Weems and Edwards (2001)
Bed 1 Clay: slightly sandy and micaceous, a trace 4.0 20.0
of very fine dark grains; massive and
structureless; tough, plastic and competent
(100% core recovery); close to yellowish
gray (5Y 7/2); grades downward into:
Bed 2 Clay; very sandy, some dark grains and 4.0 24.0
“sooty” smears; massive and structureless;
tough, hard and competent; yellowish gray
(5Y 7/2) to very light yellowish gray (5Y 8/2);
fairly abruptly grades downward into:
Bed 3 Sandstone: mostly fine to medium grained but 9.0 28.0
some coarse grained sand present; argillaceous;
rudely stratified; hard, tough and competent
but less consolidated below 34.0 feet (100%
core recovery); close to yellowish gray (5Y 8/1);
grades downward into:
Bed 4 Sand; clayey, slightly micaceous; massive 5.0 37.0
bedded and structureless; tough and
moderately to mostly competent (~85% core
recovery); color mottled between 37.0 and
39.0 feet (mottling includes light brown
(5YR 5/6), yellowish gray (5Y 7/2 – 5Y 8/1),
yellowish gray (5Y 8/1) below 39.0 feet;
grades downward into:
Bed 5 Sand: coarse, pebbly and poorly sorted; 7.5 42.0
argillaceous; mostly massive and
structureless except below 47.0 feet where
bedding is inclined; sediment is tough,
coherent and moderately to mostly
competent (~77% core recovery); yellowish
gray (5Y 8/1); abruptly overlies:
Bed 6 Sand; mostly fine to coarse grained, poorly 8.0 49.5
sorted; feldspathic; somewhat argillaceous,
massive and structureless; unconsolidated
but tough and resistant (100% core recovery);
Very coarse sand at 49.0 to 50.0 feet;
Sand is slightly micaceous, fine grained
and well sorted from 50.0 feet to 51.0 feet;
Grades downward by decrease in sand-size
and improvement in sorting into:
Bed 7 Top of Ebenezer Formation, member #5 of Weems and Edwards
(2001) at 57.5 feet
Sand: fine to medium grained and moderately 7.5 57.5
sorted; somewhat argillaceous, a trace of mica;
massive and structureless; unconsolidated
but tough, resistant and competent; yellowish
gray (5Y 7/2); grades downward into:
Bed 8 Sandy clay/clayey sand: quartz sand is fine 2.0 65.0
to medium grained, moderately well sorted;
massive and structureless; tough, resistant
and competent; grades downward into:
Bed 9 Sand: medium to coarse grained in the upper 10.0 67.0
part of the Bed, finer grained below 71 feet;
clayey and micaceous in the lower part of the
Bed; massive and structureless; resistant and
very competent (100% core recovery);
yellowish gray (5Y 7/2) in color; grades
abruptly downward into:
Bed 10 Sandstone: (Altamaha-type sandstone), 2.5 77.0
argillaceous; medium to coarse grained and
moderately sorted; crudely layered and flaggy;
moderately indurated and competent (100%
core recovery); moderate yellowish brown
(10YR 5/4) to light olive gray (5Y 6/1);
grades abruptly downward:
Bed 11 Sand; medium grained and moderately 2.5 79.5
sorted; feldspathic and argillaceous, massive
and structureless; tough coherent and mostly
to moderately competent (~80% core recovery);
abruptly overlies:
Bed 12 Sandstone: (typical Altamaha sandstone), 17.0 82.0
fine to coarse grained and moderately poor
sorting; somewhat argillaceous; crudely
layered, very tough, compact and resistant,
(100% core recovery); color mottled;
moderate brown (5YR 4/4), yellowish gray
(5Y 7/2), dark yellowish brown (10YR 4/2),
moderate yellowish brown (10R 4/6), and
light olive gray (5Y 6/1); grades downward
into:
Bed 13 Sand: medium to coarse grained and poorly 9.0 99.0 sorted; more argillaceous than overlying bed;
crudely layered and less color mottling below
99.0 feet; basal one foot consists of
friable sandstone; tough coherent and
competent; appears to grade abruptly
downward into:
MIDDLE MIOCENE, SERRAVALLIAN
MEIGS FORMATION - 24 feet
Coosawhatchie Clay – equivalent
Ebenezer Formation, member #4 of Weems and Edwards
(2001) at 107.7 feet
Bed 14 Clay: interlayered with silty, very fine grained, 4.0 108.0
very well sorted, sugary sand; clay and sand
are thinly interstratified and interlaminated,
sand occurs mainly along partings within the
clay; clay tends to be brecciated and blocky
with scattered fine to medium clay clasts;
unconsolidated but coherent and competent
(100% core recovery; upper one foot of clay
is color mottled grayish orange (10YR 7/4)
and pale greenish yellow (10Y 8/2); underlying
clay appears unweathered and is yellowish gray
(5 Y 7/2) to pale yellowish gray (5 Y 8/2), sand
is yellowish gray (5 Y 8/1); grades downward
into:
Bed 15 Sand: fine to very fine grained, well to very 9.0 112.0
well sorted; appears massive and structureless
but on closer inspection is vaguely and rudely
layered, some undulatory bedding, some
intervals appear bioturbated; soft and almost
loose (little recovery in lower part of the Bed,
core gap from ~114.5 feet to ~121 feet, average
core recovery is ~28%); yellowish gray (5 Y 8/1);
One foot of undulatory bedded to slightly
bioturbated, finely sandy clay at ~113 feet;
Six inches of undulatory bedded, finely sandy
clay at ~114.5 feet;
Merges very gradually downward into:
Bed 16 Clay: silty to very finely sandy, siliceous, 5.0 121.0
cherty; laminated; brittle, fractured, and
breaks conchoidally; moderately indurated
but poorly competent (~28% core recovery);
yellowish gray (5Y 7/2) in color; grades
downward into:
Bed 17 Sand: fine to medium grained, homogenous 4.0 126.0
and well sorted; slightly argillaceous, slightly
micaceous, trace of dark minerals; massive
and structureless; unconsolidated and soft
but competent (100% core recovery);
yellowish gray (5Y 7/2); in color grades
downward into:
Bed 18 Ebenezer Formation, member #2 of Weems and Edwards
(2001) at 130.0 feet
Clay: finely sandy, layer of clay clasts at 130 2.0 130.0
feet; clay is brittle and fractured; appears
massive and structureless; slightly
consolidated and competent; yellowish gray
(5Y 7/2) in color, disconformably overlies:
MEIGS FORMATION - 24 feet
Coosawhatchie Clay – equivalent
Ebenezer Formation, member #4 of Weems and Edwards
(2001) at 107.7 feet
Bed 14 Clay: interlayered with silty, very fine grained, 4.0 108.0
very well sorted, sugary sand; clay and sand
are thinly interstratified and interlaminated,
sand occurs mainly along partings within the
clay; clay tends to be brecciated and blocky
with scattered fine to medium clay clasts;
unconsolidated but coherent and competent
(100% core recovery; upper one foot of clay
is color mottled grayish orange (10YR 7/4)
and pale greenish yellow (10Y 8/2); underlying
clay appears unweathered and is yellowish gray
(5 Y 7/2) to pale yellowish gray (5 Y 8/2), sand
is yellowish gray (5 Y 8/1); grades downward
into:
Bed 15 Sand: fine to very fine grained, well to very 9.0 112.0
well sorted; appears massive and structureless
but on closer inspection is vaguely and rudely
layered, some undulatory bedding, some
intervals appear bioturbated; soft and almost
loose (little recovery in lower part of the Bed,
core gap from ~114.5 feet to ~121 feet, average
core recovery is ~28%); yellowish gray (5 Y 8/1);
One foot of undulatory bedded to slightly
bioturbated, finely sandy clay at ~113 feet;
Six inches of undulatory bedded, finely sandy
clay at ~114.5 feet;
Merges very gradually downward into:
Bed 16 Clay: silty to very finely sandy, siliceous, 5.0 121.0
cherty; laminated; brittle, fractured, and
breaks conchoidally; moderately indurated
but poorly competent (~28% core recovery);
yellowish gray (5Y 7/2) in color; grades
downward into:
Bed 17 Sand: fine to medium grained, homogenous 4.0 126.0
and well sorted; slightly argillaceous, slightly
micaceous, trace of dark minerals; massive
and structureless; unconsolidated and soft
but competent (100% core recovery);
yellowish gray (5Y 7/2); in color grades
downward into:
Bed 18 Ebenezer Formation, member #2 of Weems and Edwards
(2001) at 130.0 feet
Clay: finely sandy, layer of clay clasts at 130 2.0 130.0
feet; clay is brittle and fractured; appears
massive and structureless; slightly
consolidated and competent; yellowish gray
(5Y 7/2) in color, disconformably overlies:
LOWER MIOCENE, BURDIGALIAN
HAWTHORNE GROUP
MARKS HEAD FORMATION – 117.5 feet
Upper Marks Head – 67.5 feet
Chipola/Dogtown - equivalents
Bed 19 Sand: medium grained and well sorted; 11.0 132.0
argillaceous in upper 1 foot, slightly
argillaceous down section, upper
argillaceous layer contains burrows with
lithologies from overlying formation; massive
and structureless, unconsolidated but
mostly coherent (~90% core recovery); pale
yellowish brown (10YR 6/2); grades
downward into:
Bed 20 Clay: slightly and finely sandy, trace of fine 5.0 143.0
mica; massive and structureless; hard and
tough with conchoidal fracture, competent
(100% core recovery) light yellowish gray
(5Y 8/2) to yellowish gray (5Y 8/1) in color;
abruptly overlies:
Bed 21 Sand: fine to medium grained, moderately 19.0 148.0
well sorted; slightly argillaceous but more
argillaceous and clayey from 153 feet to
154 feet; some pelletal phosphate, dark
minerals present; massive and structure-
less; unconsolidated but is more
competent in upper part of the Bed with
less competence and poor recovery in lower
part (average core recovery is ~79%; very
pale orange (10YR 8/2) to yellowish gray
(5Y 7/2) to dark yellowish gray (5Y 7/1);
overlies core gap:
CORE GAP 5.0 167.0
Bed 22 Ebenezer Formation, member #1 of Weems and Edwards
(2001) at 172.0 feet
Sand: silty to very fine to medium grained, 27.5 172.0
and mostly well sorted; scattered layers of
chert occur with associated very thin clay
layers, some scattered intragranular silica,
molds of diatoms at ~182 feet; slightly
argillaceous and phosphatic, more pelletal
phosphate occur in the lower part of the
Bed, clay clasts and phosphate nodules
occur at the base of the Bed;
Generally massive and structureless;
Sand is poorly consolidated and there is
poor core recovery in upper part, better
coherence in lower part, basal 6 inches is
indurated; the average core recovery is
~70%;
Color mottled in top few inches – light brown
(5YR 5/6) and shades or reddish purple
(5RP), sand is mostly light olive gray (5Y 6/1)
with some moderate olive gray (5Y 5/1),
chert color is mostly olive black (5Y 2/1),
clay where present is olive gray (5Y 4/1);
Appears to disconformably overlie;
Top of, Berryville Clay Member, Coosawhatchie Formation
(upper part) of Weems and Edwards (2001) at 199.0 feet
Lower Marks Head - 50 feet
Chipola/possibly Torreya – equivalent
Bed 23 Clay: (fullers earth), probably siliceous, 14.0 199.5
very slightly phosphatic and dolomitic in
the lower part of the Bed, scattered traces
of fine grained sand, small clay intraclasts
from ~201 feet to ~205 feet; appears
massive and structureless but exhibits
some flowage in the lower part of the Bed;
clay is brittle, fractured and shattered with
less fracturing in the lower part; somewhat
consolidated or cemented and mostly
competent (~89% core recovery); colors are
variable shades of olive gray-greenish gray
(5GY 6/1), to light olive gray (5Y 6/1), to
pale olive (10Y 6/2) to light olive gray
(5Y 5/2); grades downward into:
Top of Meigs Member, Coosawhatchie Formation, of Weems
and Edwards (2001) at 203.9 feet
Bed 24 Sand: fine grained and well sorted; very 5.5 213.5
slightly argillaceous, trace of mica and
pelletal phosphate; massive and
structureless; unconsolidated and
moderately to mostly coherent and
competent; (~79% core recovery); light olive
gray (5Y 5/2); grades downward into:
Bed 25 Sand: very fine to fine grained and well 8.5 219.0
sorted; with thin clay layers and laminae,
a trace of pelletal phosphate and mica in
the upper part of the Bed, conspicuous
dark minerals at ~223 feet; thinly layered;
unconsolidated, soft and poorly coherent
and poorly competent (~32% core
recovery); sand is light olive gray (5Y 5/2),
clay layers are dark greenish gray
(5Y 4/1); abruptly overlies:
Bed 26 Claystone: siliceous; laminated; hard; 0.75 227.5
common to abundant impressions of
diatoms; probably competent; light
olive gray (5Y 5/2); overlies core gap;
CORE GAP 3.75 228.25
Bed 27 Sand: sand is very fine to fine grained, 14.0 232.0
well sorted; argillaceous, small clay
intraclasts from ~233.5 feet to ~236 feet,
a thin clay layer at ~243 feet, a trace of
pelletal phosphate; appears mostly
massive and structureless; hard and
tough. moderately to mostly competent
(~84% core recovery); light olive gray
(5Y 6/1); grades broadly downward into;
Bed 28 Sand; fine to medium grained, moderately 3.5 246.0
poorly sorted; scattered clay intraclasts and
quartz pebbles, some mica and a trace of
pelletal phosphate, common very fine
grained dark minerals; massive and
structureless; sand is soft but moderately
to mostly competent (~86% core recovery),
friable; light olive gray (5Y 6/1); appears to
disconformably overlie:
LOWER MIOCENE, AQUITANIAN
HAWTHORNE GROUP
PARACHUCLA FORMATION – 205 feet
Porters Landing Member - 56.5 feet
Upper Chattahoochee Fm.– equivalent
Top of Coosawhatchie Formation, Tybee Phosphorite
Member of Weems and Edwards (2001) at 248.8 feet
Bed 29 Clay: (Parachucla-type clay), slightly silty; 2.5 249.5
vaguely laminated to thinly bedded; tough,
almost hard and competent (100% core
recovery; light olive gray (5Y 6/1); grades
downward by increase in silt and fine sand
into:
Bed 30 Sand: fine grained and well sorted; somewhat 6.5 252.0
argillaceous especially in upper part, slightly
micaceous, trace of pelletal phosphate;
appears massive and structureless, could be
bioturbated and almost homogenized; firm,
coherent and competent (100% core recovery);
yellowish gray (5Y 7/2); abruptly overlies:
Bed 31 Sandstone: very fine grained to medium 0.5 258.5
grained and moderately sorted; a few clay
intraclasts; massive and structureless;
somewhat indurated and competent;
greenish gray (5GY 6/1); abruptly overlies:
Bed 32 Clay: (fullers earth), finely sandy; massive 1.0 259.0
and structureless; coherent, brittle and
competent breaks with conchoidal fracture:
greenish gray (5GY 6/1); grades downward
into:
Bed 33 Intraclastic clay in sand matrix: (fullers earth 4.0 260.0
clasts), sand matrix consists of fine to very
fine grained, silty sand; massive and
structureless; sediment is unconsolidated,
coherent and competent (100% core recovery)
pale olive (10Y 6/2 in color; abruptly overlies:
Bed 34 Clay (Parachucla-type clay): slightly silty 1.0 264.0
and finely sandy; appears bioturbated,
probably almost homogenized and massive;
firm, tough and competent; somewhat
mottled - yellowish gray (5Y 7/2) to light
olive gray (5Y 5/2); grades downward into:
Bed 35 Clay (fullers earth), silty, a few clay intraclasts; 4.5 265.0
massive bedded and structureless; variably
coherent but competent (100% core recovery)
yellowish gray (5Y 7/2), grades downward into:
Top of Marks Head Formation, member #3 of Weems and
Edwards (2001) at 270.0 feet
Bed 36 Clay: fullers earth, trace of silt, mica, dark 13.5 269.5
minerals and pyrite? thinly layered;
unconsolidated and moderately competent
(~69% core recovery), very irregular fracture;
color varies from light yellowish gray
(5Y 8/2), yellowish white (5Y 9/2), pinkish
gray (5Y 8/1), and very pale orange
(10YR 8/2; overlies core gap:
CORE GAP 9.0 283.0
Bed 37 Sand: very fine to fine grained, some 3.0 292.0
medium grained sand, slightly silty, well
sorted; abundant dark minerals; common,
fine phosphate pellets, some small, rounded
shell fragments; very slightly argillaceous;
massive and structureless; loose, almost
incoherent but moderately competent
(~50% core recovery); light olive gray in
color;
Bed 38 Sand: as above but with some fullers earth 4.5 295.0
layers at the top of the Bed and clay flasers
lower down, also more interstitial fullers earth
clay in lower part; unconsolidated, moderately
coherent and competent (~53% core recovery);
light olive gray (5Y 6/1); ; overlies core gap:
CORE GAP 3.5 299.5
Bed 39 Clay: fullers earth, trace of silt and mica, 3.0 303.0
some scraps of shell fragments, some
fine grained sand layers; laminated with
silty partings; unconsolidated but firm,
coherent and competent (100% core
recovery); clay is olive gray (5Y 3/2 – 5Y4/1),
sand is light olive gray (5Y 5/2); basal lag
deposit includes fine to medium grained
sand, clay intraclasts and pelletal
phosphate granules; abruptly and
probably disconformably overlies;
HAWTHORNE GROUP
MARKS HEAD FORMATION – 117.5 feet
Upper Marks Head – 67.5 feet
Chipola/Dogtown - equivalents
Bed 19 Sand: medium grained and well sorted; 11.0 132.0
argillaceous in upper 1 foot, slightly
argillaceous down section, upper
argillaceous layer contains burrows with
lithologies from overlying formation; massive
and structureless, unconsolidated but
mostly coherent (~90% core recovery); pale
yellowish brown (10YR 6/2); grades
downward into:
Bed 20 Clay: slightly and finely sandy, trace of fine 5.0 143.0
mica; massive and structureless; hard and
tough with conchoidal fracture, competent
(100% core recovery) light yellowish gray
(5Y 8/2) to yellowish gray (5Y 8/1) in color;
abruptly overlies:
Bed 21 Sand: fine to medium grained, moderately 19.0 148.0
well sorted; slightly argillaceous but more
argillaceous and clayey from 153 feet to
154 feet; some pelletal phosphate, dark
minerals present; massive and structure-
less; unconsolidated but is more
competent in upper part of the Bed with
less competence and poor recovery in lower
part (average core recovery is ~79%; very
pale orange (10YR 8/2) to yellowish gray
(5Y 7/2) to dark yellowish gray (5Y 7/1);
overlies core gap:
CORE GAP 5.0 167.0
Bed 22 Ebenezer Formation, member #1 of Weems and Edwards
(2001) at 172.0 feet
Sand: silty to very fine to medium grained, 27.5 172.0
and mostly well sorted; scattered layers of
chert occur with associated very thin clay
layers, some scattered intragranular silica,
molds of diatoms at ~182 feet; slightly
argillaceous and phosphatic, more pelletal
phosphate occur in the lower part of the
Bed, clay clasts and phosphate nodules
occur at the base of the Bed;
Generally massive and structureless;
Sand is poorly consolidated and there is
poor core recovery in upper part, better
coherence in lower part, basal 6 inches is
indurated; the average core recovery is
~70%;
Color mottled in top few inches – light brown
(5YR 5/6) and shades or reddish purple
(5RP), sand is mostly light olive gray (5Y 6/1)
with some moderate olive gray (5Y 5/1),
chert color is mostly olive black (5Y 2/1),
clay where present is olive gray (5Y 4/1);
Appears to disconformably overlie;
Top of, Berryville Clay Member, Coosawhatchie Formation
(upper part) of Weems and Edwards (2001) at 199.0 feet
Lower Marks Head - 50 feet
Chipola/possibly Torreya – equivalent
Bed 23 Clay: (fullers earth), probably siliceous, 14.0 199.5
very slightly phosphatic and dolomitic in
the lower part of the Bed, scattered traces
of fine grained sand, small clay intraclasts
from ~201 feet to ~205 feet; appears
massive and structureless but exhibits
some flowage in the lower part of the Bed;
clay is brittle, fractured and shattered with
less fracturing in the lower part; somewhat
consolidated or cemented and mostly
competent (~89% core recovery); colors are
variable shades of olive gray-greenish gray
(5GY 6/1), to light olive gray (5Y 6/1), to
pale olive (10Y 6/2) to light olive gray
(5Y 5/2); grades downward into:
Top of Meigs Member, Coosawhatchie Formation, of Weems
and Edwards (2001) at 203.9 feet
Bed 24 Sand: fine grained and well sorted; very 5.5 213.5
slightly argillaceous, trace of mica and
pelletal phosphate; massive and
structureless; unconsolidated and
moderately to mostly coherent and
competent; (~79% core recovery); light olive
gray (5Y 5/2); grades downward into:
Bed 25 Sand: very fine to fine grained and well 8.5 219.0
sorted; with thin clay layers and laminae,
a trace of pelletal phosphate and mica in
the upper part of the Bed, conspicuous
dark minerals at ~223 feet; thinly layered;
unconsolidated, soft and poorly coherent
and poorly competent (~32% core
recovery); sand is light olive gray (5Y 5/2),
clay layers are dark greenish gray
(5Y 4/1); abruptly overlies:
Bed 26 Claystone: siliceous; laminated; hard; 0.75 227.5
common to abundant impressions of
diatoms; probably competent; light
olive gray (5Y 5/2); overlies core gap;
CORE GAP 3.75 228.25
Bed 27 Sand: sand is very fine to fine grained, 14.0 232.0
well sorted; argillaceous, small clay
intraclasts from ~233.5 feet to ~236 feet,
a thin clay layer at ~243 feet, a trace of
pelletal phosphate; appears mostly
massive and structureless; hard and
tough. moderately to mostly competent
(~84% core recovery); light olive gray
(5Y 6/1); grades broadly downward into;
Bed 28 Sand; fine to medium grained, moderately 3.5 246.0
poorly sorted; scattered clay intraclasts and
quartz pebbles, some mica and a trace of
pelletal phosphate, common very fine
grained dark minerals; massive and
structureless; sand is soft but moderately
to mostly competent (~86% core recovery),
friable; light olive gray (5Y 6/1); appears to
disconformably overlie:
LOWER MIOCENE, AQUITANIAN
HAWTHORNE GROUP
PARACHUCLA FORMATION – 205 feet
Porters Landing Member - 56.5 feet
Upper Chattahoochee Fm.– equivalent
Top of Coosawhatchie Formation, Tybee Phosphorite
Member of Weems and Edwards (2001) at 248.8 feet
Bed 29 Clay: (Parachucla-type clay), slightly silty; 2.5 249.5
vaguely laminated to thinly bedded; tough,
almost hard and competent (100% core
recovery; light olive gray (5Y 6/1); grades
downward by increase in silt and fine sand
into:
Bed 30 Sand: fine grained and well sorted; somewhat 6.5 252.0
argillaceous especially in upper part, slightly
micaceous, trace of pelletal phosphate;
appears massive and structureless, could be
bioturbated and almost homogenized; firm,
coherent and competent (100% core recovery);
yellowish gray (5Y 7/2); abruptly overlies:
Bed 31 Sandstone: very fine grained to medium 0.5 258.5
grained and moderately sorted; a few clay
intraclasts; massive and structureless;
somewhat indurated and competent;
greenish gray (5GY 6/1); abruptly overlies:
Bed 32 Clay: (fullers earth), finely sandy; massive 1.0 259.0
and structureless; coherent, brittle and
competent breaks with conchoidal fracture:
greenish gray (5GY 6/1); grades downward
into:
Bed 33 Intraclastic clay in sand matrix: (fullers earth 4.0 260.0
clasts), sand matrix consists of fine to very
fine grained, silty sand; massive and
structureless; sediment is unconsolidated,
coherent and competent (100% core recovery)
pale olive (10Y 6/2 in color; abruptly overlies:
Bed 34 Clay (Parachucla-type clay): slightly silty 1.0 264.0
and finely sandy; appears bioturbated,
probably almost homogenized and massive;
firm, tough and competent; somewhat
mottled - yellowish gray (5Y 7/2) to light
olive gray (5Y 5/2); grades downward into:
Bed 35 Clay (fullers earth), silty, a few clay intraclasts; 4.5 265.0
massive bedded and structureless; variably
coherent but competent (100% core recovery)
yellowish gray (5Y 7/2), grades downward into:
Top of Marks Head Formation, member #3 of Weems and
Edwards (2001) at 270.0 feet
Bed 36 Clay: fullers earth, trace of silt, mica, dark 13.5 269.5
minerals and pyrite? thinly layered;
unconsolidated and moderately competent
(~69% core recovery), very irregular fracture;
color varies from light yellowish gray
(5Y 8/2), yellowish white (5Y 9/2), pinkish
gray (5Y 8/1), and very pale orange
(10YR 8/2; overlies core gap:
CORE GAP 9.0 283.0
Bed 37 Sand: very fine to fine grained, some 3.0 292.0
medium grained sand, slightly silty, well
sorted; abundant dark minerals; common,
fine phosphate pellets, some small, rounded
shell fragments; very slightly argillaceous;
massive and structureless; loose, almost
incoherent but moderately competent
(~50% core recovery); light olive gray in
color;
Bed 38 Sand: as above but with some fullers earth 4.5 295.0
layers at the top of the Bed and clay flasers
lower down, also more interstitial fullers earth
clay in lower part; unconsolidated, moderately
coherent and competent (~53% core recovery);
light olive gray (5Y 6/1); ; overlies core gap:
CORE GAP 3.5 299.5
Bed 39 Clay: fullers earth, trace of silt and mica, 3.0 303.0
some scraps of shell fragments, some
fine grained sand layers; laminated with
silty partings; unconsolidated but firm,
coherent and competent (100% core
recovery); clay is olive gray (5Y 3/2 – 5Y4/1),
sand is light olive gray (5Y 5/2); basal lag
deposit includes fine to medium grained
sand, clay intraclasts and pelletal
phosphate granules; abruptly and
probably disconformably overlies;
LOWER MIOCENE, AQUITANIAN
HAWTHORNE GROUP
LOWER PARACHUCLA FORMATION - 148.5 feet
Penney Farms Fm. - Lower Chattahoochee Fm. equivalents
Marks Head Formation, member #2 of Weems and Edwards
(2001) at 306.2 feet
Bed 44 Limestone: sandy - fine grained to mostly 6.0 306.0
medium grained, well sorted; phosphatic
with phosphate pellets, probably slightly
argillaceous, becoming finely sandy
downward; massive and structureless;
chalky, consolidated, and mostly competent
(~96% core recovery); light orangish gray
(10YR 8/1), very light in color but not white
(N 9); abruptly overlies:
Bed 41 Dolostone: mostly as above but consists of 1.5 312.0
finely sandy, phosphatic dolostone; massive
and structureless; mostly competent;
very pale orange (10YR 8/2); grades
downward into:
Bed 42 Sand: fine grained and well sorted; dolomitic, 3.0 313.5
slightly argillaceous, pelletal phosphatic;
mostly massive and structureless, maybe
some very crude bedding present; becoming
less coherent downward, moderately
competent (~67% core recovery); light
yellowish gray (5Y 8/2); overlies core gap:
CORE GAP 1.5 316.5
Bed 43 Sand: (Penney Farms-lithology), dolomitic, 15.0 318.0
argillaceous, finely pelletal phosphatic with
scattered granule size pellets; massive and
structureless; coherent friable and mostly to
moderately competent (~83% core recovery);
pale yellowish gray to yellowish gray 5Y 8/2 –
5Y 7/2) to pinkish gray (5YR 8/1); grades
downward into:
Marks Head Formation, member #1 of Weems and Edwards
(2001) at 332.0 feet
Bed 44 Clay: (fullers earth), very slightly silty, a trace 8.5 333.0
of mica and pelletal phosphate, appears
cherty or siliceous in places, sandstone/
claystone in the basal few inches of the Bed;
thinly stratified; coherent and competent
(100% core recovery); pinkish gray (5YR 8/1);
very thin layer of light gray (N 7)
abruptly overlies:
Bed 45 Sand: fine grained and well sorted; slightly 2.5 341.5
argillaceous, phosphatic, no discernible
dolomite; appears massive and
structureless; unconsolidated and mostly
incoherent and poorly competent (~21%
core recovery); yellowish gray (5Y 7/2);
overlies core gap:
CORE GAP 8.0 344.0
Bed 46 Sand: fine grained and well sorted; slightly 6.0 352.0
argillaceous with thin clay flasers, clay
intraclasts from underlying bed occur in
basal 1 foot, frequent to common pelletal
phosphate, slightly micaceous; except for
thin clay layers, sand appears massive
and structureless; unconsolidated but
coherent and competent (100% core
recovery); yellowish gray (5Y 8/1); abruptly
overlies burrowed surface of:
Top of Parachucla Formation of Weems and Edwards
(2001) at 357.5 feet
Bed 47 Clay: fullers earth; top of Bed is burrowed 5.5 358.0
from overlying bed with sand from overlying
bed in the burrows, no evidence of hard
ground; dolomitic in upper part of the Bed,
dolomite diminishes downward and is nil in
in lower part; thinly stratified; unconsolidated
but coherent and competent; very pale orange
(10YR 8/2) in upper part (probably due to
presence of dolomite), light olive gray
(5Y 6/1) in lower part; abruptly overlies:
Bed 48 Sand: fine to medium grained, some coarse 1.5 363.5
grained sand, moderately to poorly sorted;
argillaceous and phosphatic, basal layer
appears to be a lag deposit with granules
and small pebbles of quartz and phosphate;
massive and structureless; unconsolidated
but coherent; light olive gray (5Y 6/1);
abruptly overlies:
Top of Tiger Leap Formation, member #4 of Weems and
Edwards (2001) at 365.7 feet
Bed 49 Sand: hard ground, 0.5 foot of calcareous 5.0 365.0
sandstone at the top of bed; fine to medium
grained, moderately sorted with some coarser,
rounded grains, argillaceous, calcareous, and
phosphatic, some fossils occur in the
sandstone at top of the Bed; massive and
structureless; rather coherent and moderately
to mostly competent (~71% core recovery)
medium light gray (N 6 in color); overlies
core gap:
CORE GAP 2.0 370.0
Bed 50 Limestone: finely sandy, argillaceous, 2.5 372.0
fossiliferous, trace of phosphate; massive
and structureless; soft, not very coherent
and of uncertain competence; very pale
orange (10YR 8/2); abruptly overlies:
Bed 51 Sandstone: calcareous; dense, friable but 2.5 374.5
moderately competent (~40% core recovery);
yellowish gray (5Y 8/1); core gap from ~375
feet to ~376.5 feet; abruptly overlies:
Bed 52 Limestone: similar to Bed 51 but less 2.5 377.0
argillaceous and more chalky and slightly
phosphatic; massive and structureless, soft
and moderately to poorly competent (~34%
core recovery); yellowish gray (5Y 8/1);
overlies core gap:
CORE GAP 4.0 379.5
Bed 53 Sandy limestone/very calcareous sandstone: 4.5 383.5
abundant mollusk molds but with some
original shell material, some pelletal
phosphate, a trace of glauconite, probably
very slightly argillaceous; massive and
structureless; hard and dense where
recovered, moderately competent (~53% core
recovery on average); very pale orange
(10YR 8/2); overlies core gap:
CORE GAP 4.0 388.0
Bed 54 Limestone/sandstone: similar to Bed 53 but 3.0 392.0
phosphate and glauconite not apparent; odd
beaded “fossils” at ~394 feet; very dense and
recrystallized, probably competent; greenish
gray (5GY 6/1); grades broadly downward
over several inches into:
Tiger Leap Formation, member #3 of Weems and Edwards
(2001) at 395.0 feet
Bed 55 Sand: fine to medium grained, well sorted; 11.0 395.0
calcareous, rare aragonitic shell fragments,
dark minerals present, a trace of phosphate,
and very slightly argillaceous; appears
massive and structureless; unconsolidated
but moderately coherent and competent
(~54% core recovery); very light olive gray
(5Y 7/1); abruptly overlies:
Tiger Leap Formation, member #2 of Weems and Edwards
(2001) at 407.5 feet
Bed 56 Sandy limestone/very calcareous sandstone 7.5 406.0
(hard ground at top of bed): sand is fine
grained and well sorted; abundantly
fossiliferous with both molds and shell
material, shells preserved in upper part,
more molds in lower part, dark minerals
present, trace of pelletal phosphate;
generally massive and structureless but
with irregular surfaces, intraclasts or filled
vugs present throughout; moderately
indurated and mostly to moderately
competent (~79% core recovery); variable
colors: very light gray (N 8) to very pale
orange (10YR 8/2) to pinkish gray
(5YR 8/1); grades abruptly downward into:
Bed 57 Sand: medium grained and well sorted; 0.5 413.5
argillaceous, calcareous, fossiliferous, trace
of phosphate; no apparent sedimentary
structures; coherent; yellowish gray
(5Y 8/1); abruptly overlies:
Bed 58 Sandstone: fine grained and well sorted; 4.5 414.0
calcareous, phosphatic, with shell fragments;
probably slightly argillaceous; flaggy;
moderately indurated but not very
competent (~22% core recovery); yellowish
gray to light olive gray (5Y 8/1 – 5Y 6/1);
core gap at 414.5 feet to 417.5 feet;
abruptly overlies:
Bed 59 Sandstone: fine grained and well sorted; 0.5 418.5
very calcareous; moderately indurated;
light olive gray (5Y 6/1); abruptly but
gradationally overlies:
Bed 60 Sand: fine grained and well sorted; 3.0 419.0
calcareous, argillaceous (less clay and more
induration in upper part of the Bed, more
clay and noninduration in lower part,
fossiliferous, a trace phosphate; appears
massive and structureless; light olive
gray (5Y 6/1) in color; overlies core gap:
CORE GAP 3.0 422.0
Bed 61 Sandstone: fine grained and well sorted; 1.0 425.0
calcareous, a few shell fragments, some dark
minerals; very hard, dense and competent;
light olive gray (5Y 6/1); abruptly but
gradationally overlies;
Bed 62 Sand: fine grained and well sorted; calcareous, 4.5 426.0
slightly argillaceous, some dark minerals, a
trace phosphate; mostly massive and
structureless but some clay flasers at ~429
feet; poorly consolidated but mostly coherent
and competent (~75% core recovery); pinkish
gray (5YR 8/1) to light olive gray (5Y 6/1);
overlies core gap:
Tiger Leap Formation, member #1 of Weems and Edwards
(2001) at 432.0 feet
CORE GAP 1.5 430.5
Bed 63 Sandy limestone/very calcareous sandstone: 5.0 432.0 abundantly fossiliferous with both molds and
shell material, dark minerals present, some
clay at ~435 feet to ~436 feet, a trace of
pelletal phosphate; generally massive and
structureless; moderately indurated and
moderately competent (~52% core recovery);
variable colors: very light gray (N 8) to very
pale orange (10YR 8/2) to pinkish gray
(5YR 8/1); overlies core gap:
CORE GAP 5.0 437.0
Bed 64 Sandstone: moldic fossiliferous and very 0.5 442.0
calcareous; structureless and probably
competent; grades downward into:
Bed 65 Sand: fine grained and well sorted; 2.5 442.5
calcareous, a trace of pelletal phosphate,
nonfossiliferous; structureless; not very
coherent and moderately competent (~50%
core recovery); light brownish gray
(5YR 7/1); overlies core gap:
CORE GAP
2.5 445.0
Top of Suwannee Limestone of Weems and Edwards (2001)
at 447.0 feet
Bed 66 Sandstone: fine grained and well sorted; 0.5 447.5
calcareous and fossiliferous; thin bedded
and flaggy; indurated and competent; pale
yellowish brown (10YR 6/2); grades abruptly
downward into:
Bed 67 Sand: fine grained and well sorted; 0.5 448.0
calcareous and dolomitic, fossiliferous; no
apparent bedding structures; coherent and
competent; pale yellowish brown (10YR 6/2);
abruptly overlies:
Bed 68 Sandy limestone/calcareous sandstone: 6.0 448.5
sand is medium grained and well sorted;
fossiliferous; phosphatic in the lower three
feet of the Bed, a few intraclasts from the
underlying bed at the base; massive and
structureless; indurated and competent
(100% core recovery); pale yellowish
brown (10YR 6/2); disconformably overlies:
LOWER OLIGOCENE? VICKSBURGIAN?
SUWANNEE LIMESTONE?? - 17.5+ feet
Bed 69 Limestone: no sand or phosphate except in 17.5 454.5
burrows from the overlying bed, fossiliferous
but not macrofossiliferous, much appears to
be of algal origin and nondescript pellets as
in the Suwannee Limestone; appears to be
massive and structureless; appears to be
Suwannee Limestone but most of core
recovery is in crumbles and debris, poorly
competent with ~27% core recovery; light
yellowish gray to yellowish gray (5Y 8/2
– 5Y 7/2); core gaps at ~458 feet to ~464
feet, and ~465 feet to total depth at 472 feet.
TOTAL DEPTH – 472 FEET
HAWTHORNE GROUP
LOWER PARACHUCLA FORMATION - 148.5 feet
Penney Farms Fm. - Lower Chattahoochee Fm. equivalents
Marks Head Formation, member #2 of Weems and Edwards
(2001) at 306.2 feet
Bed 44 Limestone: sandy - fine grained to mostly 6.0 306.0
medium grained, well sorted; phosphatic
with phosphate pellets, probably slightly
argillaceous, becoming finely sandy
downward; massive and structureless;
chalky, consolidated, and mostly competent
(~96% core recovery); light orangish gray
(10YR 8/1), very light in color but not white
(N 9); abruptly overlies:
Bed 41 Dolostone: mostly as above but consists of 1.5 312.0
finely sandy, phosphatic dolostone; massive
and structureless; mostly competent;
very pale orange (10YR 8/2); grades
downward into:
Bed 42 Sand: fine grained and well sorted; dolomitic, 3.0 313.5
slightly argillaceous, pelletal phosphatic;
mostly massive and structureless, maybe
some very crude bedding present; becoming
less coherent downward, moderately
competent (~67% core recovery); light
yellowish gray (5Y 8/2); overlies core gap:
CORE GAP 1.5 316.5
Bed 43 Sand: (Penney Farms-lithology), dolomitic, 15.0 318.0
argillaceous, finely pelletal phosphatic with
scattered granule size pellets; massive and
structureless; coherent friable and mostly to
moderately competent (~83% core recovery);
pale yellowish gray to yellowish gray 5Y 8/2 –
5Y 7/2) to pinkish gray (5YR 8/1); grades
downward into:
Marks Head Formation, member #1 of Weems and Edwards
(2001) at 332.0 feet
Bed 44 Clay: (fullers earth), very slightly silty, a trace 8.5 333.0
of mica and pelletal phosphate, appears
cherty or siliceous in places, sandstone/
claystone in the basal few inches of the Bed;
thinly stratified; coherent and competent
(100% core recovery); pinkish gray (5YR 8/1);
very thin layer of light gray (N 7)
abruptly overlies:
Bed 45 Sand: fine grained and well sorted; slightly 2.5 341.5
argillaceous, phosphatic, no discernible
dolomite; appears massive and
structureless; unconsolidated and mostly
incoherent and poorly competent (~21%
core recovery); yellowish gray (5Y 7/2);
overlies core gap:
CORE GAP 8.0 344.0
Bed 46 Sand: fine grained and well sorted; slightly 6.0 352.0
argillaceous with thin clay flasers, clay
intraclasts from underlying bed occur in
basal 1 foot, frequent to common pelletal
phosphate, slightly micaceous; except for
thin clay layers, sand appears massive
and structureless; unconsolidated but
coherent and competent (100% core
recovery); yellowish gray (5Y 8/1); abruptly
overlies burrowed surface of:
Top of Parachucla Formation of Weems and Edwards
(2001) at 357.5 feet
Bed 47 Clay: fullers earth; top of Bed is burrowed 5.5 358.0
from overlying bed with sand from overlying
bed in the burrows, no evidence of hard
ground; dolomitic in upper part of the Bed,
dolomite diminishes downward and is nil in
in lower part; thinly stratified; unconsolidated
but coherent and competent; very pale orange
(10YR 8/2) in upper part (probably due to
presence of dolomite), light olive gray
(5Y 6/1) in lower part; abruptly overlies:
Bed 48 Sand: fine to medium grained, some coarse 1.5 363.5
grained sand, moderately to poorly sorted;
argillaceous and phosphatic, basal layer
appears to be a lag deposit with granules
and small pebbles of quartz and phosphate;
massive and structureless; unconsolidated
but coherent; light olive gray (5Y 6/1);
abruptly overlies:
Top of Tiger Leap Formation, member #4 of Weems and
Edwards (2001) at 365.7 feet
Bed 49 Sand: hard ground, 0.5 foot of calcareous 5.0 365.0
sandstone at the top of bed; fine to medium
grained, moderately sorted with some coarser,
rounded grains, argillaceous, calcareous, and
phosphatic, some fossils occur in the
sandstone at top of the Bed; massive and
structureless; rather coherent and moderately
to mostly competent (~71% core recovery)
medium light gray (N 6 in color); overlies
core gap:
CORE GAP 2.0 370.0
Bed 50 Limestone: finely sandy, argillaceous, 2.5 372.0
fossiliferous, trace of phosphate; massive
and structureless; soft, not very coherent
and of uncertain competence; very pale
orange (10YR 8/2); abruptly overlies:
Bed 51 Sandstone: calcareous; dense, friable but 2.5 374.5
moderately competent (~40% core recovery);
yellowish gray (5Y 8/1); core gap from ~375
feet to ~376.5 feet; abruptly overlies:
Bed 52 Limestone: similar to Bed 51 but less 2.5 377.0
argillaceous and more chalky and slightly
phosphatic; massive and structureless, soft
and moderately to poorly competent (~34%
core recovery); yellowish gray (5Y 8/1);
overlies core gap:
CORE GAP 4.0 379.5
Bed 53 Sandy limestone/very calcareous sandstone: 4.5 383.5
abundant mollusk molds but with some
original shell material, some pelletal
phosphate, a trace of glauconite, probably
very slightly argillaceous; massive and
structureless; hard and dense where
recovered, moderately competent (~53% core
recovery on average); very pale orange
(10YR 8/2); overlies core gap:
CORE GAP 4.0 388.0
Bed 54 Limestone/sandstone: similar to Bed 53 but 3.0 392.0
phosphate and glauconite not apparent; odd
beaded “fossils” at ~394 feet; very dense and
recrystallized, probably competent; greenish
gray (5GY 6/1); grades broadly downward
over several inches into:
Tiger Leap Formation, member #3 of Weems and Edwards
(2001) at 395.0 feet
Bed 55 Sand: fine to medium grained, well sorted; 11.0 395.0
calcareous, rare aragonitic shell fragments,
dark minerals present, a trace of phosphate,
and very slightly argillaceous; appears
massive and structureless; unconsolidated
but moderately coherent and competent
(~54% core recovery); very light olive gray
(5Y 7/1); abruptly overlies:
Tiger Leap Formation, member #2 of Weems and Edwards
(2001) at 407.5 feet
Bed 56 Sandy limestone/very calcareous sandstone 7.5 406.0
(hard ground at top of bed): sand is fine
grained and well sorted; abundantly
fossiliferous with both molds and shell
material, shells preserved in upper part,
more molds in lower part, dark minerals
present, trace of pelletal phosphate;
generally massive and structureless but
with irregular surfaces, intraclasts or filled
vugs present throughout; moderately
indurated and mostly to moderately
competent (~79% core recovery); variable
colors: very light gray (N 8) to very pale
orange (10YR 8/2) to pinkish gray
(5YR 8/1); grades abruptly downward into:
Bed 57 Sand: medium grained and well sorted; 0.5 413.5
argillaceous, calcareous, fossiliferous, trace
of phosphate; no apparent sedimentary
structures; coherent; yellowish gray
(5Y 8/1); abruptly overlies:
Bed 58 Sandstone: fine grained and well sorted; 4.5 414.0
calcareous, phosphatic, with shell fragments;
probably slightly argillaceous; flaggy;
moderately indurated but not very
competent (~22% core recovery); yellowish
gray to light olive gray (5Y 8/1 – 5Y 6/1);
core gap at 414.5 feet to 417.5 feet;
abruptly overlies:
Bed 59 Sandstone: fine grained and well sorted; 0.5 418.5
very calcareous; moderately indurated;
light olive gray (5Y 6/1); abruptly but
gradationally overlies:
Bed 60 Sand: fine grained and well sorted; 3.0 419.0
calcareous, argillaceous (less clay and more
induration in upper part of the Bed, more
clay and noninduration in lower part,
fossiliferous, a trace phosphate; appears
massive and structureless; light olive
gray (5Y 6/1) in color; overlies core gap:
CORE GAP 3.0 422.0
Bed 61 Sandstone: fine grained and well sorted; 1.0 425.0
calcareous, a few shell fragments, some dark
minerals; very hard, dense and competent;
light olive gray (5Y 6/1); abruptly but
gradationally overlies;
Bed 62 Sand: fine grained and well sorted; calcareous, 4.5 426.0
slightly argillaceous, some dark minerals, a
trace phosphate; mostly massive and
structureless but some clay flasers at ~429
feet; poorly consolidated but mostly coherent
and competent (~75% core recovery); pinkish
gray (5YR 8/1) to light olive gray (5Y 6/1);
overlies core gap:
Tiger Leap Formation, member #1 of Weems and Edwards
(2001) at 432.0 feet
CORE GAP 1.5 430.5
Bed 63 Sandy limestone/very calcareous sandstone: 5.0 432.0 abundantly fossiliferous with both molds and
shell material, dark minerals present, some
clay at ~435 feet to ~436 feet, a trace of
pelletal phosphate; generally massive and
structureless; moderately indurated and
moderately competent (~52% core recovery);
variable colors: very light gray (N 8) to very
pale orange (10YR 8/2) to pinkish gray
(5YR 8/1); overlies core gap:
CORE GAP 5.0 437.0
Bed 64 Sandstone: moldic fossiliferous and very 0.5 442.0
calcareous; structureless and probably
competent; grades downward into:
Bed 65 Sand: fine grained and well sorted; 2.5 442.5
calcareous, a trace of pelletal phosphate,
nonfossiliferous; structureless; not very
coherent and moderately competent (~50%
core recovery); light brownish gray
(5YR 7/1); overlies core gap:
CORE GAP
2.5 445.0
Top of Suwannee Limestone of Weems and Edwards (2001)
at 447.0 feet
Bed 66 Sandstone: fine grained and well sorted; 0.5 447.5
calcareous and fossiliferous; thin bedded
and flaggy; indurated and competent; pale
yellowish brown (10YR 6/2); grades abruptly
downward into:
Bed 67 Sand: fine grained and well sorted; 0.5 448.0
calcareous and dolomitic, fossiliferous; no
apparent bedding structures; coherent and
competent; pale yellowish brown (10YR 6/2);
abruptly overlies:
Bed 68 Sandy limestone/calcareous sandstone: 6.0 448.5
sand is medium grained and well sorted;
fossiliferous; phosphatic in the lower three
feet of the Bed, a few intraclasts from the
underlying bed at the base; massive and
structureless; indurated and competent
(100% core recovery); pale yellowish
brown (10YR 6/2); disconformably overlies:
LOWER OLIGOCENE? VICKSBURGIAN?
SUWANNEE LIMESTONE?? - 17.5+ feet
Bed 69 Limestone: no sand or phosphate except in 17.5 454.5
burrows from the overlying bed, fossiliferous
but not macrofossiliferous, much appears to
be of algal origin and nondescript pellets as
in the Suwannee Limestone; appears to be
massive and structureless; appears to be
Suwannee Limestone but most of core
recovery is in crumbles and debris, poorly
competent with ~27% core recovery; light
yellowish gray to yellowish gray (5Y 8/2
– 5Y 7/2); core gaps at ~458 feet to ~464
feet, and ~465 feet to total depth at 472 feet.
TOTAL DEPTH – 472 FEET