Geologic Unit: Tres Hermanos

Usage:

Tres Hermanos Formation (NM*)

Subunits:

(ascending): Atarque Sandstone Member (NM*), Carthage Member (NM*), Fite Ranch Sandstone Member (NM*).

Geologic age:

Late Cretaceous (Turonian)*

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

Type locality stated to be in north part of sec. 26, T. 3 N., R. 7 W., Socorro Co., central northern NM. Named from Tres Hermanos Buttes (Dane, 1959).
Type area stated to be in T. 2 and 3 N., R. 5 and 6 W., Socorro Co., central NM (Hook and others, 1983).
Principal reference section: in secs. 8 and 17, T. 5 S., R. 2 E., Socorro Co., central NM (Hook and others, 1983).
Reference sections: in NW/4 sec. 6, T. 2 N., R. 5 W., and in NW/4 NE/4 sec. 5, T. 10 N., R. 17 W., Socorro Co., central NM (Hook and others, 1983).

AAPG geologic province:

San Juan basin*
Orogrande basin*