Hydreionocrinus
- Phylum: Echinodermata
- Class: Crinoidea
- Order: Cladida
- Family: Hydreionocrinidae
- Genus: Hydreionocrinus
Species of Hydreionocrinus present in the Pennsylvanian of the American Midcontinent
Geological Range
Morrowan to Virgilian; Extinct.
Paleogeographic Distribution
Texas to Colorado.
Stratigraphic Occurrences
- Virgilian
- Harpersville Formation (Belknap Member) (TX)
- Lawrence Formation (Haskell Limestone Member) (KS)
- Missourian
- Checkerboard Formation (KS)
- Dennis Limestone (Winterset Limestone Member) (KS)
- Dennis Limestone (Winterset Limestone Member) (OK)
- Iola Limestone (Avant Limestone Member) (OK)
- Plattsburg Limestone (KS)
- Stanton Limestone (OK)
- Stanton Limestone (Stoner Limestone Member) (KS)
- Desmoinesian
- Millsap Lake Formation (TX)
- Mineral Wells Formation (TX)
- Wewoka Formation (OK)
- Morrowan
- Bloyd Shale (Brentwood Limestone Member) (OK)
