07203 - Top Rare Associated Ordovician Crinoid and Edrioasteroid (Spinadiscus) Fish teeth bulk Impressive specimen that preserves its

Impressive specimen that preserves its natural root practically in its entirety

The vertebral body is preserved

and no serrations

The details of the anatomy of the superficial osseous structure of the root are extremely well preserved

51 Inch = 13 mm

07203 - Top Rare Associated Ordovician Crinoid and Edrioasteroid (Spinadiscus) Fish teeth bulk Impressive specimen that preserves itsEdrioasteroidea is an extinct class of echinoderms. The living animal would have resembled a pentamerously symmetrical disc or cushion. They were obligate encrusters and attached themselves to inorganic or biologic hard substrates (frequently hardgrounds or brachiopods). The oldest undisputed fossils of Edrioasteroidea are known from Cambrian (Stage 3, about 515 520 Ma ago) of Laurentia and are among the oldest known fossils of echinoderms. Some