Taxa Count: 11

SPIRIFERIDAE

Anthracospirifer Lane, 1963

Anthracospirifer occiduus (Sadlick, 1960)

Neospirifer Fredericks, 1924

Neospirifer cameratus (Morton, 1836)

Neospirifer goreii (Mather, 1915)

Spirifer Sowerby, 1816

Spirifer cameratus (Morton, 1836)

Spirifer centronatus Shimer, 1926

Spirifer goreii (Mather, 1915)

Spirifer occidentalis Girty, 1927

Spirifer rockymontanus Marcou, 1858