Geologic map of Putnam County, Florida ( FGS: Open file map series 6 )

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FGS030692 FLORIDA GEOLOGICAL SURVEY
OPEN FILE MAP SERIES No. 6 DEPARTMENT OF NATURAL RESOURCES
GEOLOGIC MAP OF PUTNAM COUNTY, FLORIDA
+ R23E R24E R2 6 5E 2 R2 2 E 26E RE + by
T. Scott, PG.# 99

CLAY COUNTY
7 94 -b 29 5b0 ii ' 'i' '" i 't 'i ''

geologydespitean often pare data base A ageneralrule if
TU the undifferentiated sediments were less than 20 feet thick, the
C iAg underlying recognizable formation was mapped
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FLORAHOME overles theHawthornGroup and isoverlain unconformably by the






ridge anddune



S'- ,, '. ..ERLACHEN.. .
Z Undlff eentlated t uaternary sediments (u) occur wdesepread in
PutnamCounty Te undifrenated \edment are compsd of











T Q SCALE
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Qr












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Consolidated, variably sandy clayey, shelly crbonate ediment)










S. GEOLOGIC MAP OF
Pea a nd other.organicnchsdent areoftenpresent Thi unit










-coun u belo PUTNAM COUNTY







r: ^^%^" O r ^FLORIDA y

T. Scott, REFERG.# 99
- -I "T \ Preliminary field mapping by
SR. Rupert and R.A. Johnson
o, 1 1992
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FR RuTO PONnNA 29Jn









THIS IS AN INTERIM GEOLOGIC MAP MAIONCOUNT ISLAND
EDITING AND EDGE MATCHING HAVE
NOT BEEN COMPLETED. UPDATING E -- -ol
AND CORRECTING ARE CONTINUING.M C


IWALTER SCHMIDT

STATE GEOLOGIST AND CHIEF
SR2E 24E E 26E R27E 28E
12E + R24E 12S E R 26 E, + R27Et r R2.E

PAGE 1

T 3 N29 50' 81 50'R 23 E R 24 E R 25 E R 26 E R 27 E R 28 ET 12 S T 11 S T 10 S T 9 SCARTOGRAPHY BY JIM JONES & TED KIPER 207l207l20l19l309l19l20l15l20l100l100l100l15l15l17o17o309l19l15 17o l15l17o308BlLAKE CRESCENTLAKE GEORGEDRAYTON ISLAND CRESCENT CITYLITTLE GEORGE LAKEWELAKA POMONA PARKOKLAWAHA LAKEST.JOHNSRIVERBOSTWICK PALATKA FLORAHOME315l315l100ll20l21 21l26l20Al20Al21l21lINTERLACHEN315l315l315l310l308l19lST. JOHNS RIVERGeorges LakeCLAY COUNTYFLAGLER COUNTY ST. JOHNS COUNTY ALACHUA COUNTYMARION COUNTYVOLUSIA COUNTYMARION COUNTYMARION COUNTYCLAY COUNTY CLAY COUNTYALACHUA COUNTYVOLUSIA COUNTY 81 40' 81 30' 82 00' 29 40' 29 30' T 8 S T 13 S 82 00' 81 30' 81 40' R 28 E R 27 E R 26 E R 25 E R 24 E R 23 E81 50' T 13 S T 8 S 29 30' 29 40' T 9 S T 10 S T 11 S T 12 S 29 50' N SCALE4 MILES 3 2 1 0.5 0 6 KILOMETERS 5 4 3 2 1 0 THIS IS AN INTERIM GEOLOGIC MAP. EDITING AND EDGE MATCHING HAVE NOT BEEN COMPLETED. UPDATING AND CORRECTING ARE CONTINUING. Tc Qr Tc Qu Qu Qr Tc Qu Qu TcOPEN FILE MAP SERIES No. 6 FGS030692 Qu Tc Qtr Qr Tc Qu QuYEV STATE GEOLOGIST AND CHIEF EWALTER SCHMIDT1TS. 097G ALFRODIS RU I1992LOEGOLACPUTNAM COUNTY Tc Qr QrGEOLOGIC MAP OFPreliminary eld mapping by F.R. Rupert and R.A. JohnsonFLORIDAT. Scott, P.G.# 99 BY (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 RESOURCESQu QrFLORIDA GEOLOGICAL SURVEYfrom ne to very coarse, moderately to well sorted with common Peat and other organic-rich sediments are often present. This unit consolidated, variably sandy, clayey, shelly carbonate sediments). mapped as Holocene uvial sediments (alluvium) (Qr). This unit is tributaries, 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 although unconformably(?) on Nashua Formation or Hawthorn Group sediments. package may contain reworked Cypresshead Formation and lies numbers of mollusk shells and organic deposits. This sediment sands, clayey sands and clays occasionally containing limited Putnam County. The undierentiated sediments are composed of Undierentiated Quaternary sediments (Qu) occur widespread in heavy-mineral concentrations. These sands were deposited as beach The Trail Ridge sands contain economically important ore grade beds and pieces of wood are common in the Trail Ridge sands (Qtr). Organic matter ranging from a nely divided organic matrix to peat generally ne to medium grained and moderately to well sorted. Trail Ridge and associated features. The quartz sands are portion 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 a sands of Trail Ridge in western Clay County and thin surcial overlies the Hawthorn Group and is overlain unconformably by the Formation, a variably shelly, clayey sand. It unconformably the Cypresshead Formation grades laterally down dip into the Nashua molds can be seen in exposures. Huddlestun (1988) suggests that in the subsurface. Occasionally, faint, poorly preserved mollusk Colors range from reddish-orange in exposed sections to olive gray minor percentages, particularly in the ner grained sediments. minor amounts and is generally kaolinite. Mica often occurs in occurrences 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 ranging late Tertiary, Late Pliocene Cypresshead Formation (Tc) (Scott, The oldest stratigraphic unit mapped in Putnam County is the the undierentiated sediments were less than 20 feet thick, the geology despite an often sparse data base. As a general rule, if were included in order to provide a more accurate picture of the lithostratigraphic units and informal units. Both types of units topographic maps. Geologic units identied include formal well cuttings, cores, natural and man-made exposures and Community Aairs. The geology of the county was mapped utilizing Environmental Protection Agency (EPA) and the Florida Department of hazards. Funding for this eort 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, FLORIDAunderlying recognizable formation was mapped. T. Scott, P.G.# 99 by