Holocene ichnology of eastern Mississippi Sound Alabama Geological Survey of Alabama Circular The ichnology of an Alabama estuary eastern Mississippi Sound was studied in vibracores by means of visual examination and x radiography Vibracoring is an

  • Title: Holocene ichnology of eastern Mississippi Sound, Alabama
  • Author: Andrew K. Rindsberg
  • ISBN: null
  • Page: 255
  • Format: Paperback
  • Geological Survey of Alabama Circular 167The ichnology of an Alabama estuary, eastern Mississippi Sound, was studied in 29 vibracores by means of visual examination and x radiography Vibracoring is an inexpensive and highly effecitve means of collecting undisturbed samples of subsurface sediment in shallow water cores up to 25 feet 8 m deep were obtained with minimal dGeological Survey of Alabama Circular 167The ichnology of an Alabama estuary, eastern Mississippi Sound, was studied in 29 vibracores by means of visual examination and x radiography Vibracoring is an inexpensive and highly effecitve means of collecting undisturbed samples of subsurface sediment in shallow water cores up to 25 feet 8 m deep were obtained with minimal disturbance of sedimentary structures This ichnologic study is one of the first to utilize vibracores as the chief sampling method Previous studies of estuarine ichnology relied on samples less than 3 feet 1 m deep long vibracores enabled penetration to the basal unconformity underlying the Holocene section Eight facies are characterized by grainsize, shell content, and physical and biogenic sedimentary structures marsh, beach, shoreface, oyster biostrome, nearshore, midbay, shallow shelf, and pass Polychaetes and crustaceans are the main bioturbators In general, sand, including beach and shoreface facies, is biotrubated by Ophiomorpha Salt marsh mud contains roots and Thalassinoides irregular form , and may be capped by peat Nearshore and midbay mud to muddy sand has a low diversity of burrows and a low abundance of mollusks The estuarine midbay facies is dominated by Thalassinoides regular form , Chondrites, Terebellina, and Helicodromites, with relatively few mollusks Normal marine shallow shelf mud to sandy mud was seen only in the subsurface it was probably deposited before the westward prolongation of Dauphin Island restricted the water circulation behind it The shallow shelf facies includes Thalassinoides regular form , Chondrites, Cylindrichnus, and Teichichnus, accompanied by relatively abundant mollusks Compared with the thoroughly studied estuaries of Georgia, Mississsippi Sound has fewer vertical burrows, and its subtidal facies therefore belong to the Cruziana ichnofacies of Seilacher 1964 Georgia estuaries have a mixed Skolithos Cruziana ichnofacies Howard and Frey, 1975 The difference is ascribed largely to greater tidal influence in Georgia than in Alabama 9 feet 3 m tidal range twice a day in Georgia, compared with only 1.5 feet 0.5 m once a day in Alabama.

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      Published :2019-01-08T03:52:49+00:00

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