1. Olcostephanus
    [Olcostephanus (O.) sayni]
  2. Olcostephanus
    [Olcostephanus (O.) sp.]
  3. Orbignyiceras
    [Hecticoceras (Orbignyiceras) gr. trezeense (M)]
  4. Orbignyiceras
    [Hecticoceras (Orbignyiceras) trezeense (M)]
  5. Orthodactylites
    [Dactylioceras (Orthodactylites) semicelatum]
  6. Ostlingoceras
    [Ostlingoceras (O.) aff. colcanapi]
  7. Ostlingoceras
    [Ostlingoceras (O.) puzosianum]
  8. Otosphinctes
    [Perisphinctes (Otosphinctes) arkelli]
  9. Otosphinctes
    [Perisphinctes (Otosphinctes) sp.]
  10. Otosphinctes
    [Perisphinctes (Otosphinctes) sp.]