Geologic map of Duval County, Florida ( FGS: Open file map series 4 )

DUVAL ( .DXF )

DUVAL ( .pdf )

DUVAL ( .txt )

DUVAL_pdf.txt

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FGS020692
OPEN FILE MAP SERIES No.4


FLORIDA GEOLOGICAL SURVEY
DEPARTMENT OF NATURAL RESOURCES


I RI RE + R I E GEOLOGIC MAP OF DUVAL COUNTY, FLORIDA
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T.bScott, P.G.# 99


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GEOLOGIC MAP OF

DUVAL COUNTY

FLORIDA
BY
T. Scott, PG.# 99
Preliminary field mapping by
J.D. Arthur and PA. Bond
1992


WALTER SCHMIDT
STATE GEOLOGIST AND CHIEF


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,,underyingrecognizable formtionwas mapped









overlies the Hawthorn Group and is overlan uniconformably by the
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In ,o ,edareas the es dimen are veryhi. and very

conditions although somn e flaval working ha occurred
In the southeastern quarter of the county, east and south of



NashuaFormation The surfaceexpresionofthis unit controlsthe




Ples,,tone,,nd Holoene coastal deposi,,ts (Oph) The sediments a
composed of sands, ts andl lays that sometimes contain varying
perentages of organic matter The sands may contain mi and
hevyminerls The sand G reopoory o well sorted dependingon
the depositional environment. These include beach, marsh and





heavyminerals This unit lies on undifferentiatedPleistoene and
Holocene coastal deposits
REFERENCES
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PAGE 1

JACKSONVILLE AIRPORT GARDEN CITY T 1 N T 1 S T 2 S T 3 SR 28 E R 27 E R 26 E R 25 E R 24 E R 23 E 81 30' 81 40' 81 50' 30 20' 82 00' T 2 N 30 30' 30 10'T 4 S R 29 ET 4 S30 10' 30 30' T 2 N30 20' T 3 S T 2 S T 1 S T 1 N 82 00' 81 50'R 23 E R 24 E R 25 E 81 40' R 27 E 81 30' R 28 E R 29 EJOHNSRIVERST.Mill CoveSt.JohnsRiverJACKSONVILLEBALDWIN MAXIVILLEATLANTIC BEACH NEPTUNE BEACH JACKSONVILLE BEACHTroutRiverST.JOHNSRIVER 17o5l17l5o 9l15l1o 115l115lA1AlA1AlA1Al105l 212l115l115l202l13l13l9Al9l l9 1ol5 1o5ll134 21l15l9Al 228l l228l8 10l301o200l119l90o10p10p8l208l295o295o111l103l9Al217l9Al9Al9Al10lA1Al l101 115l104l104l105l295o115Cl N A S S A U C O U N T Y N A S S A U C O U N T YS T. J O H N S C O U N T YB A K E R C O U N T YN A S S A U C O U N T YC L A Y C O U N T YC L A Y C O U N T YS T. J O H N S C O U N T YATLANTIC OCEANQtrCARTOGRAPHY BY JIM JONES SCALE4 MILES 3 2 1 0.5 0 6 KILOMETERS 5 4 3 2 1 0 N Qu THIS IS AN INTERIM GEOLOGIC MAP. EDITING AND EDGE MATCHING HAVE NOT BEEN COMPLETED. UPDATING AND CORRECTING ARE CONTINUING. Tc QuOPEN FILE MAP SERIES No. 4 FGS020692Qu QbdWALTER SCHMIDT STATE GEOLOGIST AND CHIEF SUR T19. ES07 ARFLOIDL 1992GOGELOAI CVEYDUVAL COUNTY QbdGEOLOGIC MAP OFT. Scott, P.G.# 99 Preliminary eld mapping by J.D. Arthur and P.A. BondFLORIDABY (eds.) Southeastern Geological Society Annual Field Trip Guidebook, February 19-29, 1988, pp. 70-72. 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 heavy minerals. This unit lies on undierentiated Pleistocene and contain shell fragments. The sands often contain 5-10 percent prominent landforms. The quartz sands comprising the dunes may Little Talbot Island are the coastal sand dunes (Qd) forming the Sand dunes are present all along the coast. However, only on undierentiated Quaternary sediments or Nashua Formation. the depositional environment. These include beach, marsh and heavy minerals. The sands are poorly to well sorted depending on percentages of organic matter. The sands may contain mica and composed of sands, silts and clays that sometimes contain varying Pleistocene and Holocene coastal deposits (Qph). The sediments are rivers and streams are sediments referred to as undierentiated Along the present day coast,the associated lagoons and coastal until encountering a larger stream perpendicularly crossing the drainage pattern and streams follow the swales, coast parallel Nashua Formation. The surface expression of this unit controls the lie unconformably(?) on undierentiated Quaternary sediments or may contain signicant percentages of heavy minerals. They may grained, moderately to well sorted and unfossiliferous. The sands The quartz sands comprising this unit are generally ne to medium the St. Johns River, is an area of beach ridges and dunes (Qbd). In the southeastern quarter of the county, east and south of lagoonal sediments which lie unconformably(?) on older, Scott, T.M., 1988, The Cypresshead Formation in northern Georgia Geologic Survey Bulletin 104, 162p. Holocene coastal deposits. REFERENCES ridges.DEPARTMENT OF NATURAL RESOURCES Qph QdFLORIDA GEOLOGICAL SURVEY The oldest stratigraphic unit mapped in Duval County is the the Hawthorn Group. These sediments were deposited under marine detailed geologic map would show the underlying Nashua Formation or In localized areas, these sediments are very thin and a very unconformably(?) on Nashua Formation or Hawthorn Group sediments. package may contain reworked Cypresshead Formation and lies containing limited numbers of mollusk shells. This sediment is composed of sands, clayey sands and clays occasionally River, is mapped as undierentiated Quaternary sediments (Qu). It Central and much of northern Duval County, along the St. Johns economically important ore grade heavy-mineral concentrations. in the Trail Ridge sands (Qtr). The Trail Ridge sands contain divided organic matrix to peat beds and pieces of wood are common moderately to well sorted. Organic matter ranging from a nely The quartz sands are generally ne to medium grained and county are the Quaternary, Pleistocene sands forming Trail Ridge. Overlying the Cypresshead Formation in the western tip of the in a shallow, nearshore, marine setting. It occurs in the western surcial sands and soils elsewhere. The Cypresshead was deposited sands of Trail Ridge in western-most Duval county and thin 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 from ne to very coarse, moderately to well sorted with common 1988). The Cypresshead Formation consists of quartz sands ranging late Tertiary, Late Pliocene Cypresshead Formation (Tc) (Scott, conditions although some uvial reworking has occurred. These sands were deposited as beach ridges and dunes. one third of Duval County. 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 Duval County, Florida was developed as a GEOLOGIC MAP OF DUVAL COUNTY, FLORIDAunderlying recognizable formation was mapped. T. Scott, P.G.# 99 by


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