Article · Wikipedia archive · Last revised Jul 27, 2026

Medina Group

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.

Last revised
Jul 27, 2026
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Medina Group
Stratigraphic range: Silurian
Outcrop of the Medina Group in Upstate New York
TypeGroup
Sub-units
Location
RegionNew York
CountryUnited 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.1

References

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.
Geological cross section of the Medina Group source ↗