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Antillipecten alumensis

Geological Range

Early Miocene to Middle Miocene; Extinct.

Paleogeographic Distribution

Northern Florida to Georgia.

Remarks

Original Description (from Dall, 1898, p. 740):

"Oligocene of the Chipola horizon, in the lower bed at Alum Bluff, Chattahoochee River, Florida; Ball.

Shell small, thin, with compressed, flattish umbones and fourteen or fifteen feeble, obsolete ribs on the lower part of the disk separated by equal shallow interspaces; the whole surface marked with fine concentric lines; ears subequal, concentrically striate, not radiated, except the byssal ear, which has five scabrous riblets and a well-marked notch; interior fluted to correspond with the external ribs; the cardinal crura developed. Alt. reaching 15-18 mm. in fully adult shells; figured specimen 8, lat. 7.5 mm.

This small shell is sufficiently distinct in its characters to indicate its specific rank, though it may be that it attains a larger size when adult than any of the specimens obtained. One or two of the specimens have the ribs more rounded and prominent than the majority."

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Stratigraphic Occurrences

Middle Miocene
Coosawhatchie Formation (Charlton Member) (GA)
Early Miocene
Chipola Formation (N. FL)
<i>Antillipecten alumensis</i> from the Early Miocene Chipola Fm. of Calhoun County, Florida (UF 76342).
Antillipecten alumensis from the Early Miocene Chipola Fm. of Calhoun County, Florida (UF 76342).
Specimen of <i>Antillipecten alumensis</i> figured by Dall (1898, pl. 34, fig. 10 and 11); 8.5 mm in length.
Specimen of Antillipecten alumensis figured by Dall (1898, pl. 34, fig. 10 and 11); 8.5 mm in length.
Middle Miocene Map
Middle Miocene Map
Early Miocene Map
Early Miocene Map<