Belden Formation Fossils

The Belden Formation is Pennsylvanian in age, upper Morrowan to lower Atokan. The fossils shown here were collected near Dotsero, in Eagle County, Colorado.

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• Molluscs
  • Cephalopods
    • Pseudorthoceras knoxense (nautiloid)
  • Bivalves
    • Astartella concentrica
• Echinoderms
  • Echinoids
    • Archaeocidaris sp. (echinoid spine)
• Brachiopods
  • Plicochonetes sp.
  • Anthracospirifer sp.
• Bryozoans
  • Fenestella sp.

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