Medina Group

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Medina Group, also known as the Cataract Group, is a geologic group in New York State, United States. It dates back to the Silurian period and includes several rock units:

- Whirlpool Sandstone
- Power Glen Shale
- Devils Hole Sandstone
- Grimsby Formation
- Thorold Sandstone
- Cambria Shale
- Kodak Sandstone

The Medina Group outcrops in Upstate New York and is categorized as a geologic group. A key reference is the US Geological Survey Bulletin 2086 (1995), which revised the stratigraphy and correlations of the Niagaran provincial series (Medina, Clinton, and Lockport groups) in western New York. Related materials include a geological cross section and a depositional map. The Wikipedia article is a stub, inviting more information.