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Estuaries of the georgia coast usa sedimentology and biology part 8 fossil and recent skeletal remains in georgia estuaries



Estuaries of the georgia coast usa sedimentology and biology part 8 fossil and recent skeletal remains in georgia estuaries



Senckenbergiana Maritima 7: 257-295



These estuaries are better sources of fossils for paleontologic study than are the scanty inland outcrops of the same stratigraphic units in Georgia. This estuarine mixing of faunas is a widespread, normal process that probably has ancient analogs in numerous coastal plain settings; evaluation of possible stratigraphic leakage should be prerequisite to the biostratigraphic and paleoecologic analysis of ancient estuarine sequences. Present-day mollusk faunas in Georgia estuaries overlap broadly with adjacent marine ones. The following species are the best indicators of estuarine conditions: gastropods Littorina irrorata, Nassarius obsoletus, and Urosalpinx cinerea, and pelecypods Brachidontes exustus, Crassostrea virginica, Ischadium recurvum, Macoma balthica, M. constricta, Martesia cuneiformis, Modiolus demissus, Mya arenaria and Rangia cuneata. Vertebrates recorded from Georgia for the 1st time include Merychippus cf. gunteri, a Miocene species and also the following late Pleistocene forms: Sylvilagus, Spermophilus, Geomys, Neofiber, Hydrochoerus and Chlamytherium. Several of the Pleistocene vertebrates, including ground squirrels, pocket gophers, horses and bison, apparently reached Georgia from western semiarid grasslands by way of a "savanna corridor". Many bones have been bored by pholadid clams.

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