Geologic Unit: Ortega

Usage:

Ortega Quartzite of /Hondo Group (NM*)
Ortega Formation of /Hondo Group (NM)

[Hondo Group preempted by Hondo Sandstone Member by Lang (1937) in NM.]

Geologic age:

late Paleoproterozoic*

Type section, locality, area and/or origin of name:

Notable exposures in Petaca area, including Ortega Mountain type area, and in Picuris area, Rio Arriba and Taos Cos., [Carson National Forest area], central northern NM (Just, 1937) .
Principal reference locality: about 3.5 mi south-southeast of village of Vallecitos in a canyon of the Rio Vallecitos, in east-central part of sec. 34, T. 26 N., R. 8 E., La Madera 7.5-min quadrangle, Rio Arriba Co., [Carson National Forest area], central northern NM (Wobus, 1985).
Principal reference section (Hondo Group): Hondo Canyon area, in secs. 29 and 32, T. 24 N., R. 12 E., Taos SW 7.5-min quadrangle, Taos Co., northern Picuris Mountains, [Carson National Forest area], central northern NM (Bauer and Williams, 1989).
Reference sections: (1) Ortega Mountains, Brazos uplift; (2) cliffs near Pilar, northern Picuris Mountains; (3) Jawbone syncline, northern Tusas Mountains; and (4) Rattlesnake Canyon, south end of Copper Hill, south-central Picuris Mountains (Bauer and Williams, 1989).

AAPG geologic province:

Southern Rocky Mountain region*