tc qu - ufdcimages.uflib.ufl.edu
TRANSCRIPT
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