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Derbyia robusta

Geological Range

Atokan to Missourian; Extinct.

Paleogeographic Distribution

Kansas to Missouri.

Stratigraphic Occurrences

Missourian
Iola Limestone (KS, MO)
Atokan
Pottsville Formation (Mercer Limestone Member) (MO)
Unknown Stage
Coal Measures (MO)
Missourian Map
Missourian Map
Stratigraphic position unknown
Stratigraphic position unknown