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**Petrological characteristics:** Orthoceras limestone contains complete or partial shells of Paleozoic cephalopods (genus Orthoceras) and is associated with brachiopods (Brachipoda) and volcanic impurities. **Genesis:** Orthoceras (biodetritic) limestone forms through the transportation, sedimentation and diagenesis of nautiloid skeletal fragments in a marine environment. **Petrological characteristics:** Orthoceras limestone contains complete or partial shells of Paleozoic cephalopods (genus Orthoceras) and is associated with brachiopods (Brachipoda) and volcanic impurities. **Genesis:** Orthoceras (biodetritic) limestone forms through the transportation, sedimentation and diagenesis of nautiloid skeletal fragments in a marine environment.
