This picture is of a Receptaculites oweni (Hall, 1861) algae colony fossil. It was found in Minnesota USA. It dates to the Middle Ordovicia...

This picture is of a Maclurea magna (Lesueur, 1818) gastropod fossils. It was found in Chazy, New York, USA. It dates to the Silurian Perio...

This picture is of a Prismatophyllum (Simpson, 1900) coral fossil. It was found in Alpena County, Michigan, USA. It dates to the Middle Dev...