|
Name:
Isorophus cincinnatiensis
Age: Upper Ordovician
Formation: Fairmont Formation
Location: Near Cincinnati, Ohio
Size: Plate is 4 inches across
This specimen is not for sale
Click here for similar specimens that are for sale
Here are very unusual fossil echinoderms. These are fine edrioasteroids, Isorophus cincinnatiensis, from the Ordovician of Ohio. Edrioasteroids were primitive echinoderms which consisted of a flexible theca composed of numerous polygonal plates. In this specimen, THREE edrioasteroids have attached themselves to a brachiopod. This is probably not a symbiotic relationship, nor was the brachiopod under attack - the aragonitic/calcitic shell of the brachiopod merely provided a hard substrate for the edrioasteroids to rest upon. The edrioasteroids display good color and contrast and are well showcased on the Rafinesquina brachiopod. This is a very interesting example of this unique extinct echinoderm
|
|
