GEOLEX database Geologic Unit: Entrada Usage: Entrada Sandstone of San Rafael Group (AZ*,CO*,NM*,UT*) Entrada Sandstone (NM,UT,WY) Age: Jurassic, late Middle* Callovian, early* Callovian, middle* Geologic Province: Anadarko basin* Black Mesa basin* Denver basin* Great Basin province Green River basin* Las Vegas-Raton basin Paradox basin* Piceance basin* Plateau sedimentary province* San Juan basin* Sierra Grande uplift* Areal Extent: AZ(ne)* CO* NM(nw)* UT(se)* WY Type Locality: Type section: Entrada Point, northern San Rafael Swell, Emery Co., UT. Named from Entrada Point (Gilluly and Reeside, 1928). Principal reference section measured at Pine Creek in SW/4 sec. 29 and SE/4 sec. 30, T. 24 S., R. 3 E., Garfield Co., UT (Peterson, 1988). Subunits: (alphabetical): Cannonville Member (UT), Cow Springs Member (AZ*), Dewey Bridge Member (CO*,UT*), Escalante Member (UT), Exeter Member (NM), Gunsight Butte Member (UT), Iyanbito Member (NM*), Moab Member (CO*,UT*) or Moab Tongue (CO*,UT*), Red Mesa Member (AZ,NM,UT), Slick Rock Member (CO*,UT*). Unit Name History: Name proposed for 1 of 4 formations of San Rafael Group (Gilluly and Reeside, 1928). Areal limits; Overview (Gregory and Moore, 1931). Revised (Goldman and Spencer, 1941). Revised; Areal limits (Mackin, 1947). Revised (Eckel, 1949; Harshbarger and others, 1951). Areal limits (McLaughlin, 1954; Mackin, 1954). Overview (Harshbarger and others, 1957). Areal limits (Griggs and Read, 1959; Johnson, 1959). Revised (Johnson and Baltz, 1960). Revised; Overview (Wright and others, 1962). Divided into Gunsight Butte, Cannonville, and Escalante members (Thompson and Stokes, 1970). Mapped 1:24k in southeast Ouray Co., CO (Luedke, 1972). Revised; Areal limits (Green, 1974). Mapped 1:24k in southwest Moffat Co., CO (Rowley and Hansen, 1979). Not used (Barnes, 1983). Areal limits (O'Sullivan, 1983). Revised; Areal limits (Lucas and others, 1985). Not used (Scott, 1986). Overview (Lucas and others, 1987). Revised; Principal reference; Overview (Peterson, 1988). Revised (Condon and Huffman, 1988). Figure (GNU Staff, 1989). Areal limits (Condon, 1992). Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov). Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys. "No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses (). Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]). U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html Database project personnel Last modified: 7-Jan-2007