Archimedes Screw Fossil (020921p)
Name: Archimedes sp.
Age: Mississippian Age -345 million yrs
Formation: Warsaw Formation
Location: Adams County, Illinois
Archimedes is a genus of bryozoans with a calcified skeleton of a delicate spiral-shaped mesh that was thickened near the axis into a massive corkscrew-shaped central structure. The most common remains are fragments of the mesh that are detached from the central structure, and these may not be identified other than by association with the “corkscrew structure”. Specimens in which the mesh remains attached to the central structure are rare. Like other bryozoans, Archimedes formed and lived in colonies.
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