Periodo Ordovícico
Hiscobeccus capax (Conrad 1842)

Richmond Formation, ST. Leon, Indiana. (USA)

Hebertella occidentalis (Hall 1847)

Richmond formation, MT. Washington, Kentucky. (USA).

Plaesiomys subquadrata (Hall 1847)

Richmond formation. MT.Washigton, Kentucky. (USA)

Leptaena richmondensis (Foerste, 1909)

Richmond formation. Carrollton, Kentucky. (USA

Platystrophia clarksvillensis (Foerste 1910)

Richmond formation, MT. Washington, Kentucky

Platystrophia cypha (James 1874)

Richmond formation, MT. Washington, Kentucky. (USA).

Platystrophia ponderosa (Foerste 1909)

Richmond formation, MT. Washington, Kentucky. (USA).

Rafinesquina alternata (Conrad 1838)

Richmond formacion, ST.Leon. Indiana. (USA).

Retrorostra carleyi (Hall)

Upper Ord Madison. Indiana USA

Rhynchotrema dentatum (Hall 1847)

Richmond formation. ST. Leon, Indiana. (USA)

Rhynchotrema dentatum (Hall, 1847)

Richmond formation. ST. Leon, Indiana. (USA)

Rhynchotrema dentatum (Hall, 1847).

Richmond formation. ST. Leon, Indiana. (USA)

Strophomena nutans (Hall and Clarke 1892)

Richmond formation. ST. Leon, Indiana (USA).

Zygospira modesta (Hall 1847).

Richmond formation. Franfort, Kentucky. (USA)

Zygospira modesta (Hall 1847)

Richmond formation. Franfort, Kentucky. (USA)

Periodos