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Silurian-Devonian pelecypods and Paleozoic stratigraphy of subsurface rocks in Florida and Georgia and related Silurian pelecypods from Bolivia and Turkey

1976; United States Government Publishing Office; Linguagem: Inglês

10.3133/pp879

2330-7102

John Pojeta, Jiří Kříž, Jean Milton Berdan,

Paleontology and Stratigraphy of Fossils

The subsurface sedimentary Paleozoic rocks beneath northern Florida and adjacent parts of Georgia and Alabama comprise a .sequence of quarlzitic sandstones and micaceous shales, dark-gray shales, and red and gray siltstones ranging in age from Early Ordovician to Middle Devonian.The Silurian-Devonian pelecypod faunas from four wells (three of which, the Ragland, Cone, and Tillis wells, are in Florida, and one of which, the Chandler, is in Georgia) are described and illustrated.Also described are Silurian pelecypods from one locality in Bolivia and one in Turkey.Biostratigraphically, the faunas from the American wells range in age from Wenlockian or Ludlovian (Silurian) to Middle Devonian; the Bolivian specimens are probably Ludlovian (Late Silurian); and the Turkish specimens are probably Wenlockian or Ludlovian (Silurian).Paleoecologically, the strata in the American wel1s represent shallowwater normal marine environments, and all pelecypods known from them belong to one of three life-habit groups---'byssally attached, burrowing, or reclining.The Bol,ivian and Turkish pelecypods likewise belong only to these three life-habit groups.Analysis of the geograpMc distribution of the Florida Paleozoic pelecypod genera shows that they are closest to the forms found in central Bohemia and Poland; elements of this fauna also occur in Nova Scotia, North Mrica, and South America. ACKNOWLEDGlVIENTSWe would like to thank the following persons for their help and cooperation: N ecdet Ozgiil, of the Turkish Geological Survey, for collecting the specimens from Turkey and W. T. Dean, of the Geological Survey of Canada, for bringing the Turkish material to our attention; Mario Suarez-Riglos brought the Bolivian specimens to our attention; E. L.