GEOLEX

Summary of Citation: Bobcat Hill

Publication:
Gillerman, E., 1958, Geology of the central Peloncillo Mountains,
   Hidalgo County, New Mexico, and Cochise County, Arizona: New
   Mexico Bureau of Mines and Mineral Resources Bulletin, no.
   57, 152 p.

Usage in Publication:
Bobcat Hill conglomerate

Modifications:	Geologic Province:	Dominant Lithology:
Named	Pedregosa basin	Sandstone Conglomerate

Summary:
Named from exposures on north and west sides of Bobcat Hill, secs 25, 26, 35, and 36, T24S, R21W, Hidalgo Co, NM, Pedregosa basin. No type locality designated. Geologic map included. Measured sections in SE1/4 sec 27, T24S, R21W and in sec 28, T24S, R21W described. Is 724 ft thick in western part of area and 1,138 ft thick near North Star mines. Is made up of sandstone interbedded with conglomerate. Sandstone is medium bedded, fine grained, grayish-green to yellowish-gray, slightly calcareous, an impure volcanic arkose. Conglomerate is composed of pebbles and cobbles of andesite, of round to subround limestone, and a few pieces of granite. Andesite increases in abundance upward. Unconformably overlies volcanic rocks. Is overlain by andesite. Assigned a Cretaceous or Tertiary age on geologic map.

Summary of Citation: Bobcat Hill

Publication:
Lucas, S.G., 1992, Eocene mammal from the Bobcat Hill Conglomerate,
   Peloncillo Mountains, southwestern New Mexico: New Mexico
   Geology, v. 14, no. 1, p. 9-12

Usage in Publication:
Bobcat Hill Conglomerate

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Pedregosa basin

Summary:
Is a redbed sequence whose age is poorly constrained. Unconformably overlies Lower Cretaceous rocks. Mammal vertebra collected from upper volcaniclastic sandstone and conglomerate member of the Bobcat Hill Conglomerate on southeast slope of Bobcat Hill in the SE 1/4, SW 1/4, NW 1/4, NW 1/4 sec 36, T 24 S, R 21 W, Hidalgo Co., NM, Pedregosa basin. The specimen is about the size and is morphologically similar to posterior cervical vertebrae of late Eocene (Duchesnean-Chadronian) brontotheres. It is also the right size and morphology as a Chadronian entelodont. The oldest rocks that overlie the Bobcat Hill are no younger than early Oligocene. Measured section of upper member. May have been deposited as an early volcaniclastic apron deposit of the Mogollon-Datil volcanic field. Correlatable with rocks in the Rubio Peak Formation [Eocene, Oligocene, depending on author], or to lower part of Datil Group [Oligocene] on basis of age and lithology. [Age of lower part of Bobcat Hill not discussed.}