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Archimedes swallovanus, bryozoanFossil bryozoan dating from the Carboniferous rocks, Mississippian, Golconda Fm. Marigold, Illinois, U.S.A
Spiral axis of Archimedes, bryozoanArchimedes, was a bryozoan possibly living in association with an alga. From the Lower Carboniferous limestone, Iowa, USA. c. 350-330 million years old