Seaweed

Lawrence Formation

Late Pennsylvanian (Douglas Group of the Virgilian Stage)

Top and bottom--Specimens of an extinct seaweed--a variety of green algae--from the upper Pennsylvanian Lawrence Formation of the Douglas Group, Virgilian Stage--305 to 303 million years old. Called scientifically, Perissothallus versiformis. Photographs courtesy a specific scientific publication.

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