Pleistocene carbonate stratigraphy of South Florida: Evidence for high-frequency sea-level cyclicity
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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.
Study Area
| 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 |
| DOI | 10.2112/JCOASTRES-D-09-00052.1 |
| Volume | 26 |
| Issue | 4 |
| Year Published | 2010 |
| Language | English |
| Publisher | Coastal Education & Research Foundation |
| Contributing office(s) | St. Petersburg Coastal and Marine Science Center |
| Description | 10 p. |
| First page | 605 |
| Last page | 614 |
| Country | United States |
| State | Florida |
| Other Geospatial | Florida Keys |
| Google Analytic Metrics | Metrics page |