Lower Cambrian Hyolithid Fossils from Nevada

Hyolithid Fossils

Phylum Hyolitha, or Phylum Mollusca, Class Hyolitha

Geological Time: Lower Cambrian

Size (25.4 mm = 1 inch): Largest Hyolithid is 24 mm; matrix 100 mm at widest point

Fossil Site: Pioche Shale, Nevada

Fossil Code: INV20

Price: $25.00


Hyolithid Fossils The Hyolithids are an extinct group of problematic animals that appeared in the lower Cambrian and persisted into the upper Permian. The taxonomy remains in dispute, with some believing they belong to a separateHyolitha disaapeared phylum, and others a disappeared class of Mollusc. 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 reached their peak in the Cambrian and declined thereafter.This plate has two Hyolithids. They come from the famous, Lower Cambrian, Pioche Shale in Nevada where they are sometimes found in association with Olenellid trilobtes.

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