T 3

N

29 50'

81 5

0'

R 23 E R 24 E R 25 E R 26 E R 27 E R 28 E

T 12

ST

11 S

T 10

ST

9 S

CARTOGRAPHY BY JIM JONES & TED KIPER

207l

207l

20l

19l

309l

19l

20l

15l

20l

100l

100l

100l15l

15l

17o

17o

309l19l

15

17o

l

15l17o

308Bl

LAKE

CRESCENT

LAKEGEORGE

DRAYTONISLAND

CRESCENTCITY

LITTLE

GEORGELAKE

WELAKA

POMONAPARK

OKLAWAHALAKE

ST. JOHNS

RIVER

BOSTWICK

PALATKA

FLORAHOME

315l

315l

100l

l20

l21

21l

26l

20Al

20Al

21l

21l

INTERLACHEN

315l

315l

315l

310l

308l

19l

ST. J

OHNS

RIV

ER

GeorgesLake

CLAY COUNTY

FLAG

LER

CO

UN

TYST

. JO

HN

S CO

UN

TY

ALA

CHU

A C

OU

NTY

MARION COUNTY

VOLUSIA COUNTY

MARION COUNTY

MARION COUNTY

CLAY COUNTY

CLAY COUNTY

ALA

CHU

A C

OU

NTY

VOLUSIA COUNTY

81 4

0'

81 3

0'

82 0

0'

29 40'

29 30'

T 8

ST

13 S

82 0

0'

81 3

0'

81 4

0' R 28 ER 27 ER 26 ER 25 ER 24 ER 23 E

81 5

0'

T 13

ST

8 S

29 30'

29 40'

T 9

ST

10 S

T 11

ST

12 S

29 50'

N

SCALE

4 MILES3210.50

6 KILOMETERS543210

THIS IS AN INTERIM GEOLOGIC MAP.EDITING AND EDGE MATCHING HAVENOT BEEN COMPLETED. UPDATINGAND CORRECTING ARE CONTINUING.

Tc

QrTc Qu

Qu

Qr Tc

Qu

Qu

Tc

OPEN FILE MAP SERIES No. 6FGS030692

QuTc

Qtr

Qr

TcQu

Qu

YE

V

STATE GEOLOGIST AND CHIEF

E

WALTER SCHMIDT

1TS. 09

7

G

AL

FR

ODI

SR

U

I

1992

LOE GOLAC

PUTNAM COUNTY

Tc

Qr

Qr

GEOLOGIC MAP OF

Preliminary �eld mapping byF.R. Rupert and R.A. Johnson

FLORIDA

T. Scott, P.G.# 99BY

(eds.) Southeastern Geological Society Annual Field Trip peninsular Florida: in Pirkle, F.L., and Reynolds, J.G.,

of the Coastal Plain of Georgia: Miocene through Holocene:Huddlestun, P.F., 1988, A revision of the lithostratigraphic units

Guidebook, February 19-29, 1988, pp. 70-72.

Scott, T.M., 1988, The Cypresshead Formation in northern

Georgia Geologic Survey Bulletin 104, 162p.

DEPARTMENT OF NATURAL RESOURCES

Qu

Qr

FLORIDA GEOLOGICAL SURVEY

from �ne to very coarse, moderately to well sorted with common

Peat and other organic-rich sediments are often present. This unitconsolidated, variably sandy, clayey, shelly carbonate sediments).

mapped as Holocene �uvial sediments (alluvium) (Qr). This unit istributaries, including Crescent Lake and the Oklawaha River, are Lowlands along the St. Johns River and some of it's

These sediments were deposited under marine conditions althoughunconformably(?) on Nashua Formation or Hawthorn Group sediments. package may contain reworked Cypresshead Formation and liesnumbers of mollusk shells and organic deposits. This sedimentsands, clayey sands and clays occasionally containing limitedPutnam County. The undi�erentiated sediments are composed of Undi�erentiated Quaternary sediments (Qu) occur widespread in

heavy-mineral concentrations. These sands were deposited as beachThe Trail Ridge sands contain economically important ore gradebeds and pieces of wood are common in the Trail Ridge sands (Qtr). Organic matter ranging from a �nely divided organic matrix to peatgenerally �ne to medium grained and moderately to well sorted.Trail Ridge and associated features. The quartz sands areportion of the county are the Quaternary, Pleistocene sands forming Overlying the Cypresshead Formation in the north-central

sands and soils elsewhere. The Cypresshead was deposited in asands of Trail Ridge in western Clay County and thin sur�cialoverlies the Hawthorn Group and is overlain unconformably by theFormation, a variably shelly, clayey sand. It unconformablythe Cypresshead Formation grades laterally down dip into the Nashuamolds can be seen in exposures. Huddlestun (1988) suggests thatin the subsurface. Occasionally, faint, poorly preserved molluskColors range from reddish-orange in exposed sections to olive grayminor percentages, particularly in the �ner grained sediments. minor amounts and is generally kaolinite. Mica often occurs inoccurrences of quartz gravel. Clay is commonly present in very

is common below ten feet of elevation.

composed of quartz sands, silt, clay and "marls" (poorly

some �uvial reworking has occurred.

ridges and dunes.

REFERENCES

shallow, nearshore, marine setting.

1988). The Cypresshead Formation consists of quartz sands ranginglate Tertiary, Late Pliocene Cypresshead Formation (Tc) (Scott, The oldest stratigraphic unit mapped in Putnam County is the

the undi�erentiated sediments were less than 20 feet thick, thegeology despite an often sparse data base. As a general rule, ifwere included in order to provide a more accurate picture of thelithostratigraphic units and informal units. Both types of unitstopographic maps. Geologic units identi�ed include formalwell cuttings, cores, natural and man-made exposures andCommunity A�airs. The geology of the county was mapped utilizingEnvironmental Protection Agency (EPA) and the Florida Department ofhazards. Funding for this e�ort was provided by the U. S.generalized base map to be utilized in predicting radon potential The geologic map of Putnam County, Florida was developed as a

GEOLOGIC MAP OF PUTNAM COUNTY, FLORIDA

underlying recognizable formation was mapped.

T. Scott, P.G.# 99 by