Pg. 339 (fig. 3), 340 (fig. 4), 341-342, 350+ (App. A). Cerro Conejo Member of Zia Formation of Santa Fe Group. Very pale-brown to pink and yellowish-red, fine- to medium-grained, moderately to well sorted arkose and lithic arkose with pale-yellow and minor yellowish-red mudstone interbeds. Contains volcanic ash beds, notably in middle part. Thickness 316 m at type. Overlies Chamisa Mesa Member of Zia Formation; underlies Navajo Draw Member of Arroyo Ojito Formation. Rocks previously assigned to "Middle Red" member of Santa Fe Formation by Bryan and McCann (1937) and to the younger unnamed member of Zia Formation by Tedford and Barghoon (1997). [Tedford and Barghoon (this vol., p. 331) include the Cerro Conejo Member in the Arroyo Ojito Formation.] Fossils (vertebrates). Age is middle and late(?) Miocene (late Barstovian and possibly Clarendonian NALMA).
Type locality (Arroyo Ojito Formation): along Arroyo Ojito, Cerro Conejo (formerly Sky Village NE) 7.5-min quadrangle, Sandoval Co., north-central NM. Named from rounded peak Cerro Conejo, [in center S/2 sec. 27, T. 14 N., R. 1 E], Cerro Conejo (formerly Sky Village NE) 7.5-min quadrangle, Sandoval Co., north-central NM.

Source: Publication.

Pg. 331-332. Cerro Conejo Member of Arroyo Ojito Formation of Santa Fe Group. [Transferred from underlying Zia Formation (see also Connell and others, this vol., p. 339+).] Considered lithogenetically continuous with the overlying fluviatile deposits of the Arroyo Ojito; conformably underlies Navajo Draw Member. Is 245 m thick, principally reddish, tabular, thin-bedded, fine sandstone and mudstone, strongly carbonate cemented by groundwater in the basal 30 m to form a persistent cliff-line above Zia Formation eolian deposits. Unconformity (1 to 1.6 m.y. hiatus) separates the Cerro Conejo from underlying Canada Pilares Member of Zia Formation. Thin volcanic ash beds occur throughout; an airfall ash 27 m above upper green claystone yielded a K-Ar (biotite) age of 13.64 +/-0.09 Ma (C. Swisher, Berkeley Geol. Center). Fossils (vertebrates). Age is considered middle to late Miocene (Barstovian to Clarendonian NALMA), based on fossil, isotopic, and magnetostratigraphic evidence.
Area of study in T. 12 and 13 N., R. 1 E. and R. 1 W., along Ceja del Rio Puerco, a badland escarpment of Puerco River, [Sky Village SE and San Felipe Mesa 7.5-min quadrangles], southern Sandoval Co., northern Albuquerque basin, north-central NM; [5+ mi southwest of Cerro Conejo type locality].

Source: Publication.

Pg. 15 (fig. 2), 18-20, 21 (fig. 6). Cerro Conejo Formation of Santa Fe Group. Raised to formation rank. Consists of very pale brown to pink and yellowish-red, well-sorted, fine- to medium-grained, medium- to thick-bedded, locally cross-stratified, tabular sandstone with minor thinly bedded mudstone interbeds. Contains abundant white to light-greenish-gray volcanic ash beds, many of which have been altered to clay. Thickness 316 m at type; ranges from 245 to 345 m along the Ceja del Rio Puerco. Overlies Zia Formation of Santa Fe Group; underlies and interfingers with Navajo Draw Member of Arroyo Ojito Formation. Fossils (vertebrates). Age is middle to late Miocene (Barstovian to Clarendonian NALMA).

Source: Publication.