Entrada Sandstone

Entrada Sandstone
Stratigraphic range: Middle Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Type of the Entrada Formation at Entrada Point, Emery County, Utah
Type	Geological formation
Sub-units	Cannonville Member, Cow Springs Member, Dewey Bridge Member, Escalante Member, Henrieville Member, EExeter Member, Gunsight Butte Member, Iyanbito Member, Moab Member, Red Mesa Member, Slick Rock Member
Underlies	Curtis Formation Todilto Formation
Overlies	Carmel Formation
Lithology
Primary	fluvial mudstone, siltstone, and eolian sandstone
Location
Coordinates	39°15′40″N 110°32′35″W / 39.261°N 110.543°W / 39.261; -110.543
Region	Colorado Plateau
Country	United States
Type section
Named for	Entrada Point, northern San Rafael Swell
Named by	James Gilluly and J.B. Reeside, Jr. (1928)
Entrada Sandstone (the United States) Show map of the United States Entrada Sandstone (Utah) Show map of Utah

The Entrada Sandstone is a formation in the San Rafael Group found in 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.^[1] The Middle Jurassic San Rafael Group was dominantly deposited as ergs (sand seas) in a desert environment around the shallow Sundance Sea.^{[2][3][self-published source?]}