Geologic Unit: Cornell Dam

Usage:

Cornell Dam Member of Valentine Formation of Ogallala Group (NE)

Geologic age:

late Tertiary (Miocene; Barstovian NALMA)

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

Type section: roadcut a few mi northeast of town of Valentine on west side of NE State Highway 12, west of original mouth of Minnechaduza Creek and its junction with Niobrara River, in SE/4 sec. 22, T. 34 N., R. 27 W., Lat. 42 deg. 53 min. 50 sec. N., Long. 100 deg. 29 min. 05 sec. W., [Cornell Dam 7.5-min quadrangle], Cherry Co., central northern NE. Named from Cornell Dam on Niobrara River, 0.25 mi above mouth of Minnechaduza Creek (Skinner and Johnson, 1984).
Reference sections: (1) on north side of Niobrara River at Rock Rapids [Rocky Ford], in secs. 9 and 16, T. 33 N., R. 24 W., [Muleshoe Creek 7.5-min quadrangle], Keya Paha Co., central northern NE; (2) on south side of Niobrara River at Norden Bridge, in SW/4 NE/4 SW/4 sec. 33, T. 33 N., R. 23 W., [Norden 7.5-min quadrangle], Brown Co., central northern NE (Skinner and Johnson, 1984).

AAPG geologic province:

Chadron arch
Salina basin