Bell Ranch Formation (NM)
Bell Ranch Formation of San Rafael Group (NM*)
late Middle Jurassic (Callovian)*
Type section: at Carpenter's Point, 18 mi southeast of Bell Ranch headquarters and 13 mi northwest of Tucumcari, [San Miguel Co.], northeastern NM. Named from Bell Ranch and proposed that name be used in Tucumcari-Sabinoso area and in northeastern NM (Griggs and Read, 1959).
Palo Duro basin*
Sierra Grande uplift
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).