Mahantango Formation
Athyridida
Athyris spiriferoides
Orthotetida
Eoschuchertella arctostriata
Phacopida
Eldredgeops rana
Rhynchonellida
Cupularostrum congregata
Rynchonellida
Eumetabolotoechia multicostatum
Spiriferida
Allenella tullius
Ambocoelia umbonata
Cyrtina hamiltonensis
Elita fimbriata
Strophomenida
Arcuaminetes scitulus (Hall, 1857)
Devonochonetes coronatus
Terebratulida
Cryptonella planirostra