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30535 - Top Rare Association of 16 Edrioasteroid (Spinadiscus) Ordovician Edrioasteorids Genevievella granulatus Orthoceras geinitzi

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Description

Orthoceras geinitzi

Nice hematoide quartz

Journal of Vertebrate Paleontology 24: 744-747

†Rhombopterygia sp

30535 - Top Rare Association of 16 Edrioasteroid (Spinadiscus) Ordovician Edrioasteorids Genevievella granulatus Orthoceras geinitziEdrioasteroidea 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

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