(Scale bar is 1 cm)
This is the most common and the largest of spatangoid echinoids in the Ocala Limestone of Georgia, reaching a size of almost 15 cm (6 inches) in some cases.
The species occurs in the middle and upper parts of the Ocala Limestone, and ranges upward into the lower Oligocene Bridgeboro Limestone as well. It is one of the few species of any group that is known to cross the Eocene Oligocene boundary in the region. Its long temporal range makes it less useful than other species for correlation.
The shell form is rather variable and it is likely that individuals had a wide range of tolerance for different sediment types. The species is, in fact, known from muddy, sandy, and even gravel-rich sediments.
AGE: LATE EOCENE AND EARLY OLIGOCENE
FORMATION: OCALA and BRIDGEBORO LIMESTONES
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