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High-Resolution Stratigraphy of a Sandy, Ramp-Type Margin—Apalachicola, Florida, U.S.A.

By
Heather A. McKeown
Heather A. McKeown
Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803-4101, U.S.A.
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Philip J. Bart
Philip J. Bart
Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803-4101, U.S.A.
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John B. Anderson
John B. Anderson
Department of Earth Sciences, Rice University, Houston, Texas 77251-1892, U.S.A.
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Published:
January 01, 2004

Abstract

High-resolution single-channel seismic data were collected on the middle shelf to upper slope, offshore Apalachicola, Florida, to characterize fluvial–deltaic stratigraphy on a sandy, ramp-type margin. On the west Florida shelf, deltas exhibit wedge-shaped geometries. Clinoform angles are relatively steep (∼ 3°), and bottomset bed development is minimal, suggesting deposition in a relatively high-energy environment.

Chronostratigraphic control for the study area is absent, so ages of deltaic units were inferred from the updip pinch-out elevations, offlap break elevations, and stratigraphic relationships. From the stratal relationships, we infer that at least three glacioeustatic cycles (OIS-9 to OIS-1) were imaged. Five units were identified, with unit 1 being the youngest.

Sediment volume for unit 4 (OIS-7 to OIS-6) was four times greater than unit 2 (OIS-5 to OIS-4). Unit 2 drainage was line-sourced and deposited deltas with a shore-parallel steep seaward margin. In contrast, unit 4 drainage was point-sourced and deposited elongate deltas on the shelf.

Highstands were dominated by deltas deposited on the middle to outer shelf. Subaerial exposure of the inner shelf and the development of an extensive braid plain characterized lowstand deposition. Lowstand incised fluvial valleys, canyons, and deep-water fans are absent. The transgressive systems tract is characterized by valley fill and sand ridges on the inner shelf and backstepped deltas and slope wedges on the middle shelf to upper slope.

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SEPM Special Publication

Late Quaternary Stratigraphic Evolution of the Northern Gulf of Mexico Margin

John B. Anderson
John B. Anderson
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Richard H. Fillon
Richard H. Fillon
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SEPM Society for Sedimentary Geology
Volume
79
ISBN electronic:
9781565762152
Publication date:
January 01, 2004

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