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PETROXESTES

Petroxestes

Trace fossil

Petroxestes is a shallow, elongate boring (a type of trace fossil) originally found excavated in carbonate skeletons and hardgrounds of the Upper Ordovician

Petroxestes

Ordovician

Second period of the Paleozoic Era

abundance of hard substrate trace fossils such as Trypanites, Palaeosabella, Petroxestes and Osprioneides. Bioerosion became an important process, particularly

Ordovician

Trace fossil

Geological record of biological activity

which has a transverse ornamentation in the form of fusiform annulation. Petroxestes is a shallow groove boring produced by mytilacean bivalves in carbonate

Trace fossil

Trace_fossil

Calcite sea

Aspect of marine historical geology

borings penetrated an inner aragonitic shell layer which dissolved away. Petroxestes borings in an Upper Ordovician hardground, southern Ohio Paleontology

Calcite sea

Calcite_sea

Carbonate hardgrounds

echinoderm holdfasts cemented to its upper surface. The scale bar is 1.0 cm. Petroxestes borings in an Upper Ordovician hardground, southern Ohio. Trypanites

Carbonate hardgrounds

Carbonate_hardgrounds

Bioerosion

Erosion of hard ocean substrates by living organisms

Trypanites borings in an Upper Ordovician hardground, southeastern Indiana. Petroxestes borings in an Upper Ordovician hardground, southern Ohio. Gastrochaenolites

Bioerosion