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Pleistocene carbonate stratigraphy of South Florida: Evidence for high-frequency sea-level cyclicity

Journal of Coastal Research

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Abstract

Pleistocene carbonates of south Florida and islands of the Florida Keys are currently divided into five marine sequences designated, from oldest to youngest, the Q1–Q5 units. The units include a mosaic of freshwater and shallow marine deposits that accumulated on the Florida platform during high sea-level stands. The units are separated by regional-scale subaerial-exposure surfaces that formed during glacioeustatic lowstands. Analyses of cores recovered at Grossman Ridge Rock Reef and Joe Ree Rock Reef in the Florida Everglades reveal additional subaerial-exposure surfaces that are used to delineate subdivisions within units Q1 (Q1a–Q1b), Q2 (Q2a–Q2d), and Q4 (Q4a–Q4b). Units Q1–Q5 preserve evidence of at least 10 separate sea-level highstands, rather than 5 as indicated by previous studies. Compilation of available uranium-series dates on corals recovered from the Florida Keys indicates that the Q4 unit accreted during sea-level maxima associated with marine oxygen-isotope Stage 9 (Q4a) and isotope Stage 7 (Q4b). The Q5 unit formed during isotope Stage 5. No reliable dates are available for units Q1–Q3. We infer that unit Q3 was formed during the extended sea-level highstand of isotope Stage 11 and that units Q2 and Q1 predate isotope Stage 11.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Pleistocene carbonate stratigraphy of South Florida: Evidence for high-frequency sea-level cyclicity
Series title:
Journal of Coastal Research
Volume
26
Issue:
4
Year Published:
2010
Language:
English
Publisher:
Coastal Education & Research Foundation
Publisher location:
Lawrence, KS
Contributing office(s):
St. Petersburg Coastal and Marine Science Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Coastal Research
First page:
605
Last page:
614
Country:
United States
State:
Florida
Other Geospatial:
Florida Keys