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Archemedes Screw Bryozoan Age: Mississippian Formation: Keokuk Formation Location: Marion County, Missouri Size: Screw is over 4 inches long This specimen is not for sale Click here for similar specimens that are for sale
Here is a very distinct specimen of Archimedes sp. from Missouri. This unusual, corkscrew-shaped bryozoan is only found the Mississippian of North America! This bryozoan colony attached itself to the ocean floor with the spiraling fronds in an upward position. The coiling feature of this fossil is easily seen. The white fossil contrasts well with the orange matrix plate. This is a very fine example of this strange-looking bryozoan.