GEOLEX database Geologic Unit: Longfellow Usage: No current usage. (†Longfellow Limestone (AZ) replaced with El Paso Limestone. See El Paso.) Age: Cambrian Ordovician, Early Ordovician, Late Geologic Province: Basin and Range province Areal Extent: AZ(e) Type Locality: Not designated. Occurs in Clifton-Morenci District, Greenlee Co., AZ (Lindgren, 1905). Unit Name History: Named; Biostratigraphic dating (Lindgren, 1905). Areal limits (Stipp and Beikman, 1959). Revised (Hill, 1959). Abandoned (Hayes, 1972). 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