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.

This article about a specific stratigraphic formation in New York state is a stub.

You can help Wikipedia by expanding it.