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Petroxestes pera bivalve boring on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 8.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 7.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 6.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 5.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 4.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 3.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 2.jpg - Ser Amantio di Nicolao

Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 1.jpg - Ser Amantio di Nicolao