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National Geologic Map Database

Geologic Unit: Newcastle

Usage:

Newcastle Sandstone (MT*,ND*,SD*,WY*)
Newcastle Formation of Dakota Group (ND)
Newcastle Sandstone of Dakota Group (NE)
Newcastle Sandstone Member of Colorado Shale (MT*)
Newcastle Sandstone Member of Skull Creek Shale (SD,WY)
Newcastle Member of Omadi Sandstone of Dakota Group (NE) [From GNC files]


Geologic age:

late Early Cretaceous (Albian)*


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

Named from town of Newcastle, Weston Co., WY (Hancock, 1920).
Type section: on northwest side of cut on U.S. Highway 85, 0.4 mi northeast of its junction with U.S. Highway 16, 1 mi east of Newcastle, in NW/4 NW/4 sec. 28, T. 45 N., R. 61 W., Weston Co., WY (Skolnick, 1958).
Type section relocated: along U.S. Highway 85, northern outskirts of Newcastle, in SW/4 SW/4 SW/4 sec. 21, T. 45 N., R. 61 W., Weston Co., WY (Baker, 1962).


AAPG geologic province:

Williston basin*
Powder River basin*
Chadron arch*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).