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Benton Shale
Stratigraphic range: Cretaceous
Gray shale (Benton Shale, Upper Cretaceous; Red Rock Canyon Open Space, Colorado Springs, Colorado, USA) 6.jpg
Gray shale (Benton Shale; Colorado Springs, Colorado)
Type Formation
Underlies Niobrara Formation
Overlies Dakota Sandstone
Primary Shale
Other Limestone, sandstone, bentonite
Region Montana, Wyoming, North Dakota, South Dakota, Colorado, Nebraska
Country United States
Type section
Named for Fort Benton, Montana

The Benton Shale (also Benton Formation or Benton Group) is a geologic formation in Montana, Wyoming, North Dakota, South Dakota, Colorado, Kansas, and Nebraska. It preserves fossils dating to the Cretaceous Period. The term Benton Limestone has also been used to refer to the chalky portions of the strata, especially the upper beds of the strata presently classified as Greenhorn Limestone. The Benton classification is obsolete in some regions, having been replaced by the ascending sequence Graneros Shale, Greenhorn Limestone, and Carlile Shale.

The classification derives its name from Fort Benton, a small city in Montana on the Upper Missouri River.

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