Gelasinostoma elegantula

Geological Range

Late Pliocene to Middle Pleistocene; Extinct.

Paleogeographic Distribution

Southern Florida to Virginia.

Remarks

Original Description (from Dall, 1892, p. 386-387):

"Newer Miocene of the Cape Fear River, North Carolina? Johnson; Pliocene of the Caloosahatchie beds, Dall; and the Myakka River and Shell Creek, Willcox.

Shell small, rather elevated, with a smooth, one-whorled, minute nucleus and three subsequent spirally sculptured whorls; whorls shouldered by a more or less evident obtuse keel above, obsolete toward the aperture; early whorls more coarsely, later ones finely evenly spirally grooved above and below; base amply rounded; umbilicus very minute, margined by a stout rounded striated rib; aperture rounded, pillar broad, arched, sulcate at the base opposite the umbilical rib, with a prominent pustule above and a smaller one below the sulcus; outer lip reflected and thickened in the adult, smooth within, joined to the pillar by a thin callus in the adult. Alt. 4.25; max. diam. 4.5 mm.

The specimen from the Cape Fear River may possibly have been derived from adjacent Pliocene beds. Some young specimens show a considerably coarser spiral sculpture than the majority of individuals, but there are intermediate gradations."

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Stratigraphic Occurrences

Middle Pleistocene

Bermont Formation (S. FL)

Early Pleistocene

Caloosahatchee Formation (S. FL)

Waccamaw Formation (SC, NC)

Late Pliocene

Duplin Formation (NC)

Jackson Bluff Formation (N. FL)

Tamiami Formation (Pinecrest Beds) (S. FL)

Yorktown Formation (VA)