GEOLEX database Geologic Unit: Escabrosa Usage: Escabrosa Group (AZ*,NM*) Escabrosa Limestone (AZ*,NM*) Age: Mississippian, Early* Osagean* Tournaisian* Visean* Mississippian, Late* Meramecian* Geologic Province: Pedregosa basin* Basin and Range province* Areal Extent: AZ(s)* NM(sw)* Type Locality: Not designated. Named from Escabrosa Ridge, Mule Mountains, Cochise Co., AZ (Ransome, 1904). Type section stated to be "just west of Black Gap" (Hayes and Landis, 1965). Principal reference section: near west edge of Mule Mountains, in NW/4 NE/4 sec. 9 and SW/4 SE/4 sec. 4, T. 23 S., R. 23 E., AZ (Hayes and Landis, 1965). Subunits: GROUP STATUS (alphabetical) --all in AZ*,NM*: Hachita Formation, Keating Formation. FORMATION STATUS (alphabetical) --all in NM*: Hachita Member, Keating Member. Unit Name History: Named (Ransome, 1904). Overview (Gilluly and others, 1954; Gilluly, 1956; Gillerman, 1958). Age modified (Stipp and Beikman, 1959). Biostratigraphic dating; Revised (Armstrong, 1962). Overview (Cooper and Silver, 1964; Simons, 1964). Age modified (Hayes and Landis, 1964). Principal reference; Overview (Hayes and Landis, 1965). Revised (Zeller, 1965). Overview (Creasey, 1967; Miller, 1970). Recognized as a group in Chiricahua Mountains, AZ, and southwestern NM; Overview (Armstrong, 1970). Biostratigraphic dating (Norby and Lundin, 1972). Overview (Soule, 1972; Armstrong and others, 1978; Drewes and Thorman, 1980). Biostratigraphic dating; Recognized as a group in the Pedregosa Mountains (Armstrong and others, 1980). Age modified (Wrucke and others, 1983). Mapped 1:24k in Big Hatchet Mountains, Hidalgo Co., NM; Revised, Keating and Hachita Members assigned (Drewes, 1991). 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