Hyolithid FossilsPhylum Hyolitha Geological Time: Lower Cambrian Size (25.4 mm = 1 inch): Largest Hyolithid fossil is 32 mm, rest are much smaller; matrix ~ 110 x 80 mm Fossil Site: Pioche Shale, Nevada Fossil Code: INV9 Price: $39.00 - sold The Hyolithids are an extinct group of problematic animals that appeared in the Cambrian and persisted into the Permian. They had a long, conically-shaped, closed shell, with a lid (operculum) covering the opening, and a pair of long, horn-like outgrowths. The animal lived on the sea-bottom, or partly buried. They are sometimes classified as a Mollusk, though as a distinct separate class. They reached their peak in the Cambrian and declined thereafter. This plate has some 15 Hyolithids, many of which are on top of one another. They exhibit the same color as the shale. They come from the famous, Lower Cambrian, Pioche Shale in Nevada where they are sometimes found in association with Olenellid trilobtes. Add a new Class of fossil animal not often offered to your fossil collection. |
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