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Gulf Trough

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Gulf Trough

Depiction of the Gulf Trough over Florida.

The Gulf Trough, also known as the Suwanee Straits,[1] is an ancient geologic feature of Florida present during the Paleogene period, a period of roughly . A strong marine current, similar to the Gulf Stream, scoured the trough from southwest to northeast.

History

During the Paleogene, what would become Florida was the submerged Florida Platform, a feature not unlike the Bahama Banks composed of carbonate sediments containing foraminifera, corals, bryozoa, and mollusks. Due to the current running through the Gulf Trough, materials needed for sedimentation were instead carried away toward the northeast.

During the Eocene through Oligocene, a period of roughly , material born of erosion began building up more rapidly in the Gulf Trough, due to the uplifting of the Appalachian Mountains to the north, which provided the primary source of siliciclastic material transported south via rivers and streams. By the Early Miocene, the trough was filled, and materials continued to move southward covering and replacing the carbonate-depositing marine environment with sands, silts, and clays; these sediments created the peninsula on which terrestrial flora and fauna could become established.[2]

References

  1. ^ Coastal Plain Building: Sea level changes shape the continent, Foundation of Florida (section), Paleontology Research Institute
  2. ^ Florida Environments Online, Florida's geological history and geological resources, ISSN 0085-0640
  • Burnett, William C., Cook, P. J., Riggs, Stanley R., Shergold, J. H., Phosphate Deposits of the World: Neogene to modern phosphorites, Cambridge University Press (May 25, 1990)

External links

  • 47, Florida Center for Library AutomationFlorida Geological Survey Bulletin


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