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Name:
Isorophusella incondita & Foerstediscus sp.
Age: Ordovician
Formation: Bobcaygeon Formation
Location: Simcoe County, Ontario, Canada
Size: Plate is 3.0" X 6.3"
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Here is a very unusual plate of echinoderms from the Ordovician of Canada. There are two different edrioasteroids on this slab. Edrioasteroids were primitive echinoderms which consisted of a flexible theca composed of numerous polygonal plates. Both of these large edrioasteroids exhibit wonderful detail. The outer rings of small plates are beautifully displayed, and the ambulacral plates are unusually well defined. The cream-colored fossils contrast nicely with the gray matrix. They are well presented on the slab of dense limestone. This is a fine plate of two different examples of these primitive echinoderms.
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