(Scale bar is 1 cm)The coastal muddy sand facies of the Paleocene (Thanetian/Sabinian) Nanafalia Formation have, in their lower parts, shells of this oyster by the billions. The species is so characteristic, and the geographic extent so great, that the lower Nanafalia is traditionally called the "Ostrea" thirsae beds, from the former name of this species.
O. thirsae is, as you might expect, an excellent fossil for correlating the lower part of the Nanafalia formation in the southeast.
The species is rarely found with individuals intergrown, as might be expected in a coastal oyster species.
AGE: LATE PALEOCENE
FORMATION: NANAFALIA FORMATION
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