(Scale bar is 1 cm.)Conical, free-living bryozoans are common in most rock types in the southeastern U.S. The identification of most bryozoans requires the slicing of thin sections and microscopic examination, even to identify the genus, but these conical forms are easy to recognize without such work. "Lunulites" is an old name for any bryozoan of this morphology, but there are probably actually several genera that can assume such a growth form. The photo above shows two specimens. The one at top left is a mold of the colony (circled) impressed into a piece of Ocala Limestone, the one at the lower right is the colony itself. In neither photo can the tiny individual zooecia be distinguished.
Species of Lunulites are common in all Paleogene rocks of the southeastern Coastal Plains, so their utility as correlation tools requires careful identification to the species level. In Georgia they are far more common in the Ocala Limestone than in any other unit, and the specimens above both came from the Ocala near Leesburg.
Because they live at the sediment surface, and are in fact mobile upon it, they do not much care what the sediment is made of, and are therefore less useful for distinguishing environments than other taxa.
AGE: LATE EOCENE
FORMATION: OCALA LIMESTONE
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