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Medina Group
Stratigraphic range: Silurian
Outcrop of the Medina Group in Upstate New York
Type	Group
Sub-units	Whirlpool Sandstone Power Glen Shale Devils Hole Sandstone Grimsby Formation Thorold Sandstone Cambria Shale Kodak Sandstone
Location
Region	New York
Country	United States

The Medina Group or Cataract Group is a geologic group in New York. It dates to the Silurian period. The group includes the Whirlpool Sandstone, Power Glen Shale, Devils Hole Sandstone, Grimsby Formation, Thorold Sandstone, Cambria Shale, Cabot Head Shale and Kodak Sandstone.

References

1. ^ Carlton E. Brett; Dorothy H. Tepper; William M. Goodman; Steven T. LoDuca; Eckert Bea-Yeh (1995). "Revised stratigraphy and correlations of the Niagaran provincial series (Medina, Clinton, and Lockport groups) in the type area of western New York" (PDF). U.S. Geological Survey Bulletin. 2086: 1. doi:10.3133/B2086. ISSN 8755-531X. Wikidata Q56798368. Retrieved 28 September 2018.

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