Wikimedi'Òc

Isotelus maximus fossil trilobite with healed bite mark (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 1 (15262673675).jpg - Natuur12

Isotelus maximus fossil trilobite (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 1 (15259810201).jpg - Natuur12

Isotelus maximus fossil trilobite (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 2 (15262901845).jpg - Natuur12

Fossil bryozoan (Arnheim Formation, Upper Ordovician; Flat Run Quarry, Clay Township, far-sw Highland County, southwestern Ohio, USA) 1 (15023301040).jpg - Natuur12

Fossil bryozoan (Arnheim Formation, Upper Ordovician; Flat Run Quarry, Clay Township, far-sw Highland County, southwestern Ohio, USA) 2 (15023403308).jpg - Natuur12

Mastigograptus perexilis (Arnheim Formation, Upper Ordovician; Mt. Orab area, Ohio, USA) 1 (17203569048).jpg - Natuur12

Mastigograptus perexilis (Arnheim Formation, Upper Ordovician; Mt. Orab area, Ohio, USA) 2 (17391011121).jpg - Natuur12

Fossil bivalve in limestone (Arnheim Formation, Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 2 (31612578708).jpg - Lu Brito

Isotelus maximus (fossil trilobite) (Flat Run Trilobite Lagerstätte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, Highland County, Ohio, USA) 3.jpg - Ser Amantio di Nicolao

Flexicalymene meeki (fossil trilobite) (Cincinnatian Series, Upper Ordovician; Cincinnati area, USA) 11.jpg - Ser Amantio di Nicolao

Flexicalymene meeki (fossil trilobite) (Cincinnatian Series, Upper Ordovician; Cincinnati area, USA) 12.jpg - Ser Amantio di Nicolao

Flexicalymene meeki (fossil trilobite) (Cincinnatian Series, Upper Ordovician; Cincinnati area, USA) 14.jpg - Ser Amantio di Nicolao

Odontopleurid trilobite cheek (Arnheim Formation, Upper Ordovician; Middletown, Ohio, USA).jpg - Ser Amantio di Nicolao