metabentonite

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• Hamilton Group — or Millboro Shale Stratigraphic range: Middle Devonian Type Geological unit Sub units Mahantango Formation Marcellus Formation Thickness up to 2,500 feet (800 m) …   Wikipedia

• Marcellus Formation — Stratigraphic range: Middle Devonian …   Wikipedia

• Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium