Entrada Sandstone

Entrada Sandstone
Stratigraphic range: Middle Jurassic
Type of the Entrada Formation at Entrada Point, Emery County, Utah
TypeGeological formation
Sub-unitsCannonville 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
UnderliesCurtis Formation
Todilto Formation
OverliesCarmel Formation
Lithology
Primaryfluvial mudstone, siltstone, and eolian sandstone
Location
Coordinates39°15′40″N 110°32′35″W / 39.261°N 110.543°W / 39.261; -110.543
RegionColorado Plateau
CountryUnited States
Type section
Named forEntrada Point, northern San Rafael Swell
Named byJames Gilluly and J.B. Reeside, Jr. (1928)
Entrada Sandstone is located in the United States
Entrada Sandstone
Entrada Sandstone (the United States)
Entrada Sandstone is located in Utah
Entrada Sandstone
Entrada Sandstone (Utah)
Entrada Sandstone conformably overlies the Carmel Formation, Park Avenue, Arches National Park

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?]

  1. ^ Peterson, Fred (1988). "Stratigraphy and nomenclature of Middle and Upper Jurassic rocks, western Colorado Plateau, Utah and Arizona". U.S. Geological Survey Bulletin. 1633-B: 27. doi:10.3133/b1633AC.
  2. ^ Lucas, S.G.; Anderson, O.J. (1997). "The Jurassic San Rafael Group, Four Corners region" (PDF). New Mexico Geological Society Guidebook. 48: 117–120. Retrieved 26 October 2021.
  3. ^ Share, Jack (2011). "The formation of the Entrada Sandstone: Tectonics, Accommodation space, Wind and lots of Sand". Written in Stone.