15" Fossil Brachiopod (Rafinesquina) and Bryozoan Plate - Indiana

This is a 15" wide plate of fossil brachiopods (mostly Rafinesquina), bryozoans, trilobite (Flexicalymene retrorsa) fragments, and a crinoid stem, collected from the Ordovician-aged Waynesville Formation (Blanchester Series) in Franklin County, Indiana. It comes from a new lease we started digging in the summer of 2023.

This specimen is accompanied by a display stand.

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.

Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet: over 25,000 species have been described, filling nearly every evolutionary niche. Due in large part to their hard exoskeletons (shells), they left an excellent fossil record.
Rafinesquina sp., Flexicalymene retrorsa & Unidentified
Oldenburg, Franklin County, Indiana
Waynesville Formation - Blanchester Series
15 x 8"
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