FGS 010692
OPEN FILE MAP SERIES No 3


R22E


 FLORIDA GEOLOGICAL SURVEY
DEPARTMENT OF NATURAL RESOURCES


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R27E


R28E


GEORGIA


SCALE


Qph


-N-




 I


FERNANDINA
 BEACH


Qu


-C ~


 cc

 0

 LU

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 The geologic map of Nasau County, Florida wa developed a a


-I-


 Sgeology depitean often parse data base Aa generalrule if
 the undifferentiated sediments were less than 20 feet thick, the
 underlying recogniableformation wa mapped





--I-





 poorly preserved mollusk mold n be een in expo ure The

 S unconformablyoverlies theHawthornGroupandis overlain

 Cypresshead was deposited in a shallow nearhore marine setting
 Undifferentiated Quaternary ediments (Ou) are mapped in much
 of the central and eastern portions ofthe county They are
-I'- ,, .. .





 S ,, , .... ,




 Pleistocene and Holocene coastal deposits (Oph) The sedimentsare
 composed of sands, silts and clays that sometimes contain varying
 percentage of organic matter The sand may contain mi and
r0} heavy minerals The sandsare poorly towell sorted depending on
 the depositional environment These include beach, march and

 Quaternary sand dunes (Od) form Amelia I land on the eastern

 S Pleistocene and Holocene coastal deposits
 REFERENCES
 Huddlestun, PF, 1988 A reviion of the lthostratigraphic units



 148p

 (eds) Southeastern Geological Society Annual Field Trip
 Guideboo, February 1 29,1988 pp 772


 GEOLOGIC MAP OF

NASSAU COUNTY

 FLORIDA
 BY
T Scott, PG.# 99 and K. Campbell, PG.# 192
 Preliminary field mapping by
 J.D. Arthur and PA. Bond
 1992


THIS IS AN INTERIM GEOLOGIC MAP
EDITING AND EDGE MATCHING HAVE
NOT BEEN COMPLETED. UPDATING
AND CORRECTING ARE CONTINUING.


 WALTER SCHMIDT
STATE GEOLOGIST AND CHIEF


R27E 21


by
T. Scott, PG.# 99


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