Bluff Formation
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The Bluff Formation is a geological formation found in the Four Corners area. It was deposited in the late Jurassic Period.
Bluff Formation at its type area, Bluff, Utah, US
Summerville Formation
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The Summerville Formation is a geological formation in New Mexico, Colorado, and Utah of the Southwestern United States. It dates back to the Oxfordian stage of the Late Jurassic.
Bluff Formation
…Stratigraphic range: Bluff Formation at its type area, Bluff, Utah, US Type Formation Unit of San Rafael Group Underlies Morrison Formation Overlies Summerville Formation Thickness 350 ft (110 m) Lithology Primary Sandstone Other Mudstone Location Coordinates Region Four Corners Country United States Type section Named…
Summerville Formation at the type locality at Summerville Point, east side of the San Rafael Swell, Emery County, Utah
Evenly bedded Summerville Formation exposed along Utah Highway 24, 2.4 miles west of Hanksville, Utah
Closeup of the Summerville Formation showing even bedding, 2.4 miles west of Hanksville, Utah.
Summerville Formation with gypsum-filled cracks. U.S. quarter dollar (24 mm) for scale