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3.7" Archimedes Screw Bryozoan Fossil - Illinois
Here is a nice example of Archimedes sp. from the Warsaw Formation of Illinois. This unusual cork-screw shaped bryozoan commonly referred to as an "Archimedes Screw" is unique to the Mississippian aged rocks of North America.
Bryozoans are microscopic aquatic invertebrates that live in colonies, forming skeletal structures similar to corals. Each skeletal structure has a form unique to each particular species. The individual byrozoans forming these colonies are filter feeders called zooids, straining nutrients from the surrounding water.
SPECIES
Archimedes sp.
AGE
LOCATION
Adams County, Illinois
FORMATION
Warsaw Formation
SIZE
3.7" long on 3.8 x 2.4" rock
CATEGORY
ITEM
#129639
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