Vibracore, Radiocarbon, Microfossil, and Grain-Size Data from Apalachicola Bay, Florida

Twichell, David C.; Pendleton, Elizabeth; Poore, Richard Z.; Osterman, Lisa E.; Kelso, Kyle W.

doi:10.3133/ofr20091031

Cited by 4 publications

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“…Cores were split longitudinally, described visually, and selected cores were sampled for textural analysis and radiocarbon dating. A description of the core collection, processing, and cataloging are summarized by Twichell et al (2009). Faunal analysis and Accelerator Mass Spectrometer (AMS) 14 C dating of the cores and a reconstruction of the Holocene depositional environments in the region are presented by Osterman et al (2009).…”

Section: Methodsmentioning

confidence: 99%

Geologic controls on the recent evolution of oyster reefs in Apalachicola Bay and St. George Sound, Florida

Twichell

Edmiston

Andrews

et al. 2010

Estuarine, Coastal and Shelf Science

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a b s t r a c tApalachicola Bay and St. George Sound contain the largest oyster fishery in Florida, and the growth and distribution of the numerous oyster reefs here are the combined product of modern estuarine conditions in the bay and its late Holocene evolution. Sidescan-sonar imagery, bathymetry, high-resolution seismic profiles, and sediment cores show that oyster beds occupy the crests of a series of shoals that range from 1 to 7 km in length, trend roughly north-south perpendicular to the long axes of the bay and sound, and are asymmetrical with steeper sides facing to the west. Surface sediment samples show that the oyster beds consist of shelly sand, while much of the remainder of the bay floor is covered by mud delivered by the Apalachicola River. The present oyster reefs rest on sandy delta systems that advanced southward across the region between 6400 and 4400 yr BP when sea level was 4e6 m lower than present. Oysters started to colonize the region around 5100 yr BP and became extensive by 1200 and 2400 yr BP. Since 1200 yr BP, their aerial extent has decreased due to burial of the edges of the reefs by the prodelta mud that continues to be supplied by the Apalachicola River. Oyster reefs that are still active are narrower than the original beds, have grown vertically, and become asymmetrical in cross-section. Their internal bedding indicates they have migrated westward, suggesting a net westerly transport of sediment in the bay.Published by Elsevier Ltd.

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Section: Methodsmentioning

confidence: 99%

Geologic controls on the recent evolution of oyster reefs in Apalachicola Bay and St. George Sound, Florida

Twichell

Edmiston

Andrews

et al. 2010

Estuarine, Coastal and Shelf Science

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“…of 27%) and epiphytic foraminifers (avg. of 21%; Twichell et al 2009). Epiphytic species including Rosalina floridana and Rosalina floridensis live attached to sea grasses (Bock 1969).…”

Section: Biofacies Analysis Of Eight Coresmentioning

confidence: 99%

“…The dried fraction was sieved at 125 μm, and split as necessary using a microsplitter to obtain approximately 200±100 specimens. Foraminifers were picked from the sample, placed on a glued 60-square micropalentological slide, sorted, and (Twichell et al 2009). …”

Section: Foraminifersmentioning

confidence: 99%

Holocene evolution of Apalachicola Bay, Florida

2009

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“…Foraminifers were picked from the sample, placed on a glued 60-square micropalentological slide, sorted, and identified using standard literature. Foraminiferal census data are reported elsewhere (Twichell et al 2009).…”

Section: Foraminifersmentioning

confidence: 99%

Holocene evolution of Apalachicola Bay, Florida

Osterman¹,

Twichell²

2011

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A program of geophysical mapping and vibracoring was conducted to better understand the geologic evolution of Apalachicola Bay. Analyses of the geophysical data and sediment cores along with age control provided by 34 AMS 14 C dates on marine shells and wood reveal the following history. As sea level rose in the early Holocene, fluvial deposits filled the Apalachicola River paleochannel, which extended southward under the central part of the bay and seaward across the continental shelf. Sediments to either side of the paleochannel contain abundant wood fragments, with dates documenting that those areas were forested at 8,000 14 C years B.P. As sea level continued to rise, spits formed of headland prodelta deposits. Between ∼6,400 and ∼2,500 14 C years B.P., an Apalachicola prodelta prograded and receded several times across the inner shelf that underlies the western part of the bay. An eastern deltaic lobe was active for a shorter time, between ∼5,800 and 5,100 14 C years B.P. Estuarine benthic foraminiferal assemblages occurred in the western bay as early as 6,400 14 C years B.P., and indicate that there was some physical barrier to open-ocean circulation and shelf species established by that time. It is considered that shoals formed in the region of the present barrier islands as the rising sea flooded an interstream divide. Estuarine conditions were established very early in the post-glacial flooding of the bay.

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Vibracore, Radiocarbon, Microfossil, and Grain-Size Data from Apalachicola Bay, Florida

Cited by 4 publications

References 0 publications

Geologic controls on the recent evolution of oyster reefs in Apalachicola Bay and St. George Sound, Florida

Geologic controls on the recent evolution of oyster reefs in Apalachicola Bay and St. George Sound, Florida

Holocene evolution of Apalachicola Bay, Florida

Holocene evolution of Apalachicola Bay, Florida

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