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The Entrada Sandstone is a formation in the San Rafael Group that is spread across the U.S. states of Wyoming, Colorado, northwest New Mexico, northeast Arizona and southeast Utah. Part of the Colorado Plateau, this formation was deposited during the Jurassic period sometime between 180 and 140 million years ago in various environments, including: tidal mudflats, beaches and sand dunes.
Additional recommended knowledge
Age and history of investigation
This formation has been dated to the early to middle Callovian stage of the latest Middle Jurassic. The type locality and place for which the unit is named is Entrada Point, located in the northern part the San Rafael Swell in Emery County, Utah.
Entrada Sandstone was named as one of the four formations of the San Rafael Group by Gilluly and Reeside in 1928. Gregory and Moore worked out the geographic extent of the formation and gave an overview of it in 1931. The extent was revised several times afterwards (most recently in 1992 by Condon). It was divided into Gunsight Butte, Cannonville, and Escalante members by Thompson and Stokes in 1970. The principal reference for the formation was written in 1988 by Peterson.
Entrada members are (in alphabetical order):
Entrada Sandstone is found in these geologic locations:
Found in these parklands (incomplete list):
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Entrada_Sandstone". A list of authors is available in Wikipedia.|