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Diplodonta acclinis

Geological Range

Early Miocene to Middle Pleistocene; Extinct.

Paleogeographic Distribution

Florida to Maryland

Remarks

Original description (from Conrad, 1832):

"Suborbicular, or lentiform, a little oblique, with strong lines of growth; hinge with 2 diverging teeth in each valve; posterior tooth of the right valve bifid; anterior muscular impression not profoundly elongated.

Locality. York-town, Va. Upper Tertiary.

This species I obtained only in a very circumscribed spot, at a considerable elevation, in sand composed chiefly of comminuted shells. This calcarious sand prevails more or less in every part of the high bank at York-town, and as it is formed of shells not partially decomposed but comminuted by attrition, the fact is obvious that it has been subjected to a violent action of the waters at a period anterior to the deposition of the perfect shells it encloses, which could only have been effected in a tranquil sea."

Stratigraphic Occurrences

Middle Pleistocene
Bermont Formation (S. FL)
Early Pleistocene
Caloosahatchee Formation (S. FL)
Waccamaw Formation (SC, NC)
Late Pliocene
Duplin Formation (SC)
Tamiami Formation (Pinecrest Beds) (S. FL)
Middle Miocene
Shoal River Formation (N. FL)
Early Miocene
Calvert Formation (Plum Point Member) (MD)
<i>Diplodonta acclinis</i> from the Early Pleistocene Waccamaw Fm. of Brunswick County, North Carolina (PRI 69974).
Diplodonta acclinis from the Early Pleistocene Waccamaw Fm. of Brunswick County, North Carolina (PRI 69974).
<i>Diplodonta acclinis</i> from the Early Pleistocene James City Fm. of Beaufort County, North Carolina (PRI 70521).
Diplodonta acclinis from the Early Pleistocene James City Fm. of Beaufort County, North Carolina (PRI 70521).
Middle Pleistocene Map
Middle Pleistocene Map
Early Pleistocene Map
Early Pleistocene Map
Late Pliocene Map
Late Pliocene Map
Middle Miocene Map
Middle Miocene Map
Early Miocene Map
Early Miocene Map<