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Title Geomorphology and tidal-bar belt depositional model of lower Florida Keys
Creator/Author Kindinger, J.L.
Publication Date1986 May 01
OSTI IdentifierOSTI ID: 5161939
Report Number(s)CONF-860624-
Other Number(s)CODEN: AAPGB
Resource TypeConference
Specific TypeJournal Article
Resource RelationAm. Assoc. Pet. Geol., Bull. ; Vol/Issue: 70:5; American Association of Petroleum Geologists annual meeting; 15 Jun 1986; Atlanta, GA, USA
Research OrgGeological Survey, Miami Beach, FL
Subject020200 -- Petroleum-- Reserves, Geology, & Exploration; FLORIDA-- SEDIMENTARY ROCKS;FLORIDA-- SEDIMENTS;SEDIMENTARY ROCKS-- DEPOSITION;SEDIMENTARY ROCKS-- GEOMORPHOLOGY;SEDIMENTS-- DEPOSITION;SEDIMENTS-- GEOMORPHOLOGY; GEOLOGIC MODELS
Related SubjectFEDERAL REGION IV;GEOLOGY;NORTH AMERICA;ROCKS;USA
Description/Abstract Changes in geomorphology from a coral reef island chain paralleling a linear platform margin to a series of oolitic islands perpendicular to the platform margin are the most striking feature of the lower Florida Keys.^Rotary cores drilled from 6.1 to 17.7 m (20 to 58 ft) total depth were taken in critical areas of the Key Largo Limestone-Miami Oolite transition near Big Pine Key.^Morphology of the Pleistocene lower Keys oolite unit is similar to and probably of the same age as the Miami Oolite.^The lower Keys have been recognized by many to represent a preserved tidal-bar system like those presently forming in the Bahamas but frozen in place by the lowering of sea level.^The maximum elevation (1.5 m or 5 ft at Big Pine Key; 3.1 m or 10 ft at Key West) of the oolite unit in the Keys is lower than that (approximately 6.1 m or 20 ft) of the oolite unit to the northeast (Miami).^The two units, located at opposite ends of the 100-mi-long (166 km) reef tract, are similar in shape.^Drilling showed the coral reef facies to be transitional with the oolite facies, occurring above a region-wide subaerial unconformity located between 3.1 and 7.6 m (10 and 25 ft) below present sea level.^Oolite facies rest on the unconformity in the oolitic Keys, and coralline facies overlie it in the Pleistocene Key Largo Limestone.^It is proposed that upward shoaling of the Pleistocene Key Largo reef limestone restricted cross-Keys tidal flow, thus forcing strongest flow around the north and south ends of the reef.^Increased tidal flow set up conditions favorable for oolite formation and tidal-bar deposition.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 607
System Entry Date2001 May 13

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