Bell Canyon Formation
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The formation consists mostly of marine sandstone and siltstone, but with five interfingering tongues of gray limestone. These extend from the Capitan reef into what was then deep, anoxic water 300–500 meters (980–1,640 ft) deep of the Permian Basin. Total thickness of the formation is 200–300 meters (660–980 ft).
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Fossils
The formation's Lamar Limestone Member of Guadalupe Mountains National Park has produced fossil holocephalan teeth.
History of investigation
The unit was first designated as a formation by DeFord and Lloyd in 1940, who raised the Delaware Mountain Formation to group rank and designed its previously informal members as formations.