Geologic Unit: Marsland

Usage:

Marsland Formation (NE*, and WY*-local)
(Also called informal "Upper Harrison" beds of Arikaree Group.)

Geologic age:

late Tertiary (Miocene; Arikareean to Hemingfordian)*

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

Type area: southwest of Marsland, along Niobrara River, in secs. 23 to 27, T. 28 N., R. 52 W., and secs. 19 and 30, T. 28 N., R. 51 W., Box Butte Co., northwestern NE (Schultz, 1938).
[Principal reference section] = "upper Harrison" beds of Peterson, 1906: from Spoon Butte, in secs. 3, 4, 5, 9, 10, and 15, T. 27 N., R. 60 W., Goshen Co., eastern WY, approx. northward to "Squaw Butte" and Squaw Creek. "Squaw Butte" is one of those names used by research workers but by no one else. The local ranchers call this landmark Coliseum Butte. Located in sec. 15, T. 33 N., R. 57 W., Sioux Co., northwestern NE, about 1.5 mi east of WY State line at head of Squaw Creek (see McKenna, 1965, p. 9, footnote 4; Skinner and others, 1977, fig. 1).
[Principal reference section] = "upper Harrison" beds of Peterson, 1909: in SE/4 sec. 28, T. 31 N., R. 57 W., [Kirtley 7.5-min quadrangle], Sioux Co., northwestern NE (Yatkola, 1978).

AAPG geologic province:

Denver basin*