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**Petrology:** Orthoceras limestone contains complete or part of shell of Paleozoic cephalopods (genus Orthoceras) associated with brachiopods (Brachipoda) and volcanic impurities.
**Genesis:** Orthoceras (biodetritic) limestone is formed via transportation, sedimentation and diagenesis of skeletal fragments of nautiloids in marine environment.
## Keywords
** Petrology:** Orthoceras limestone contains complete or part of shell of Paleozoic cephalopods (genus Orthoceras) associated with brachiopods (Brachipoda) and volcanic impurities.
** Genesis:** Orthoceras (biodetritic) limestone is formed via transportation, sedimentation and diagenesis of skeletal fragments of nautiloids in marine environment.