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81 40' 28 50' 28 40' 28 30' T 20 S T 18 S T 24 S T 23 S T 22 S T 21 S R 25 E R 24 E S U M T E R C O U N T Y CARTOGRAPHY BY JIM JONES & TED KIPERPAISLEYJOHNS R 26 E 81 50' S U M T E R C O U N T Y S U M T E R C O U N T Y T 21 S T 22 S T 23 S T 24 S T 20 S 28 30' 28 40'T 19 S 81 50' R 26 E R 24 E R 25 E 81 40' 29 00' T 19 S T 18 S 28 50' 29 10' T 15 S T 17 S T 16 S T 16 S T 17 S T 15 S 29 10' 29 00' R 28 E 81 30' R 29 E R 27 E R 27 E R 29 E R 28 E 81 30' l40l40 19l19l19l19l19l445l445l42l42l42l44l44l44l44l46l46l46l44l44l44lLake George Lake Dorr Lake NorrisLake Eustis Lake Yale Lake Grin Lake Harris Lake DoraLake Apopka Lake Minneola Lake Minnehaha Lake Louisa Lake Beauclaire Lake Little HarrisM A R I O N C O N T Y M A R I O N C O U N T Y V O L U S I A C O U N T Y S E M I N O L E C O U N T Y V O L U S I A C O U N T Y O R A N G E C O U N T Y O R A N G E C O U N T Y O R A N G E C O U N T Y P O L K C O U N T Y P O L K C O U N T Y 33l33l474l474l530l25l25l25l25l91l l91l91 561l561l565l27o27o27o50l50l50l 33l33l 565l19l48l19l437l437l439l452l MASCOTTE GROVELAND MINNEOLA CLERMONT MONTEVERDE ASTATULA OKAHUMPKA LADY LAKE LEESBURG TAVARES MOUNT EUSTIS FRUITLAND PARK HOWEY IN THE HILLS DORA UMATILLA LAKE KATHRYN HEIGHTS FOREST HILLS ASTOR RIVER ST. SCALE4 MILES 3 2 1 0.5 0 6 KILOMETERS 5 4 3 2 1 0 N Qd To Quc Quc Qr Tc Tc Qr Qr TcFGS090692 OPEN FILE MAP SERIES No. 9 Qr Ths Qd Qd EOLOGI CWALTER SCHMIDT STATE GEOLOGIST AND CHIEF TTHIS IS AN INTERIM GEOLOGIC MAP. EDITING AND EDGE MATCHING HAVE NOT BEEN COMPLETED. UPDATING AND CORRECTING ARE CONTINUING. ESFL AORIDGRVEY.1790 AL SUFLORIDA LAKE COUNTYGEOLOGIC MAP OFPreliminary eld mapping by Tom Scott, P.G. #99 R.A. Johnson and K.M. Campbell 1992 BYThsScott, T.M., 1988b, The Cypresshead Formation in northern Scott, T.M., 1988a, The lithostratigraphy of the Hawthorn Group Huddlestun, P.F., 1988, A revision of the lithostratigraphic units often present. carbonate sediments). Peat and other organic-rich sediments are and "marl" (poorly consolidated, variably sandy, clayey, shelly (alluvium) (Qr). This unit is composed of quartz sands, silt, clay County are mapped as Holocene uvial and lacustrine sediments tributaries and surrounding the lakes in the Central Valley in Lake modication of the dunes is often present. were they extend in to the county from Marion County. Karst units are recognized. sediments. Qd and Qr units may overlie Qu in areas where those the Cypresshead Formation or undierentiated Pleistocene Formation, it is mapped as Quc. This unit lies unconformably(?) on has occurred. Where Qu is thought to contain reworked Cypresshead were deposited under marine conditions although uvial reworking and there are accumulations of organic matter. These sediments numbers of mollusk shells. Surcial conditions are often swampy sands, clayey sands and clays and may rarely contain limited the Holocene fuvial and lacustrine sediments (Qr). Quaternary sediments (Qu), dune sequence sands (Qd) and possibly Group. It is unconformably(?) overlain by the undierentiated nearshore, marine setting and unconformably overlies the Hawthorn clayey sand. The Cypresshead was deposited in a shallow, laterally down dip into the Nashua Formation, a variably shelly, Huddlestun (1988) suggests that the Cypresshead Formation grades reddish-orange in exposed sections to olive gray in the subsurface. particularly in the ner grained sediments. Colors range from generally kaolinite. Mica often occurs in minor percentages, gravel. Clay is commonly present in very minor amounts and is coarse, moderately to well sorted with common occurrences of quartz (Scott, 1988b) consists of quartz sands ranging from ne to very overlain unconformably by the Cypresshead Formation. Group unconformably overlies the Eocene Ocala Limestone and is sediments were deposited under marine conditions. The Hawthorn carbonate with varying percentages of phosphate present. These The sediments consist of admixtures of sand, silt, clay and sediments can be seen in the area of Seminole and Rock Springs. of some rivers and streams in northeastern Lake County. These areas associated with spring vents and runs and along the bottoms Hawthorn Group sediments are found near the surface in low lying late Tertiary, Miocene Hawthorn Group (Ths) (Scott, 1988a). The underlying recognizable formation was mapped. 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 Qu Tc Ths Qr Qr Qu Qr QrFLORIDA GEOLOGICAL SURVEY DEPARTMENT OF NATURAL RESOURCES (eds.) Southeastern Geological Society Annual Field Trip (Miocene) of Florida: Florida Geological Survey Bulletin 59, of the Coastal Plain of Georgia: Miocene through Holocene: Lowlands surrounding the St. Johns River, some of its Dune sands (Qd) are recognized in northeastern Lake County Undierentiated Quaternary sediments (Qu) are composed of Georgia Geologic Survey Bulletin 104, 162p. Guidebook, February 19-29, 1988, pp. 70-72. peninsular Florida: in Pirkle, F.L., and Reynolds, J.G., 148p. REFERENCES The late Tertiary, Late Pliocene Cypresshead Formation (Tc) The oldest stratigraphic unit mapped in Lake County is the The geologic map of Lake County, Florida was developed as a GEOLOGIC MAP OF LAKE COUNTY, FLORIDA T. Scott, P.G.# 99 by
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