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- Usage in publication:
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- Dawes Clay Member
- Modifications:
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- Original reference
- Dominant lithology:
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- Siltstone
- AAPG geologic province:
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- Chadron arch
Galusha, T., 1975, Stratigraphy of the Box Butte Formation, Nebraska: American Museum of Natural History Bulletin, v. 156, art. 1, p. 1-68.
Summary:
Pg. 39-50. Dawes Clay Member of Box Butte Formation of Hemingford Group. = Cady's (Amer. Jour. Sci., v. 238, no. 9, 1940, p. 665) lower zone of Box Butte Member of Sheep Creek Formation. Consists of mottled green clayey siltstones and red siltstones with nodular sandy calcareous concretions. Thickness 0 to about 40 feet. Overlies Red Valley Member of Box Butte or, where absent, Runningwater Formation or Marsland Formation. In places, unconformably underlies Sand Canyon Member of Sheep Creek Formation. Age is Miocene (Hemingfordian NALMA).
Type section: on C.W. Moody's Pebble Creek Ranch, on east side of Pebble Creek, in NW/4 NW/4 sec. 14, T. 30 N., R. 49 W., [Coffee Mill Butte SE 7.5-min quadrangle], Dawes Co., northwestern NE.
Reference sections (northwestern NE):
(1) roadcut on west side of road to Box Butte Reservoir, about 6.5 mi north of Hemingford, in SE/4 NE/4 sec. 7 [fig. 13B states btw. secs. 7 and 8], T. 28 N., R. 49 W., Box Butte Reservoir East 7.5-min quadrangle, Box Butte Co.;
(2) roadcut on east side of NE State Highway 2, in SW/4 NW/4 sec. 29, T. 28 N., R. 51 W., Marsland 15-min quadrangle, Box Butte Co.;
(3) at Shimek bench mark, U.S. Coast and Geodetic Survey Triangulation Station 1934, in NE/4 SW/4 sec. 26, T. 28 N., R. 52 W., Marsland 15-min quadrangle, Box Butte Co.; and
(4) north of Mansfield Ranch bldg. site, in NW/4 SW/4 sec. 31, T. 30 N., R. 52 W., [Dead Mans Creek 7.5-min quadrangle], Dawes Co.
Source: Publication; US geologic names lexicon (USGS Bull. 1520, p. 79).
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 ( ).
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