zzzzzPg. 148. McKelligon formation of El Paso group [author does not capitalize rank terms; however, units are considered formal]. Includes Pistol Range member (new). Members in the McKelligon formation are only incompletely designated, largely because of a lack of suitable place names. Overlies Snake Hills formation (new). Underlies Scenic Drive formation (new). The McKelligon formation comprises the entire Jeffersonian series (of Flower, 1957, New Mexico Bur. Mines and Mineral Res. Memoir, no. 2, p. 18). Present in New Mexico [and Texas]. Age is Early Ordovician (middle Canadian; Jeffersonian). Canadian treated as a system in this report. Author states that his philosophy of nomenclature is contrary to "the present fashion of delimiting formations on lithology alone." The resulting proposed divisions of the El Paso Group are thus "a succession of strata and faunas."
Type locality not designated. Named from McKelligon Canyon, at the southern end of the Franklin Mountains, at the northeast edge of El Paso. [McKelligon Canyon is in the El Paso 7.5-min quadrangle, El Paso Co., TX, from about Lat. 31 deg. 49 min. 16 sec. N., Long. 106 deg. 28 min. 05 sec. W., to Lat. 31 deg. 50 min. 37 sec. N., Long. 106 deg. 29 min. 25 sec. W.].

Source: US geologic names lexicon (USGS Bull. 1350, p. 453); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).