rhodoliths
(genus and species uncertain)
"cow-patty algae"

Division Rhodophyta (red algae)

(scale bar is 1 cm)


Rhodoliths, the skeletal secretions of colonial red algae, occur with some frequency in two separate units of the Georgia Coastal Plain. They dominate the Oligocene Bridgeboro Limestone and occur in large numbers in some places in limestones of the Paleocene Clayton Formation. Rhodoliths in the Bridgeboro are usually smaller than 6-7 cm (3 in) in diameter and are usually spherical. The Paleocene rhodoliths are usually much bigger, exceeding 10 cm (4 inches), and are often flattened to dome shaped above (upper photo at top left), and hollow on the underside (bottom photo at top left). The size and flattened shape suggests the droppings of cattle to some imaginative individuals.

Where these red algae occur they indicate original water depths of less than 100m, since algae require light to photosynthesize.



SEE BRIDGEBORO RHODOLITHS FOR COMPARISON
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