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Structure Of The Tarkio Limestone Along The Humboldt Fault Zone In Southeast Nebraska, R. R. Burchett, J. L. Arrigo

Conservation and Survey Division

No abstract provided.

Water Resources Of Seward County, Nebraska, C. F. Keech

Conservation and Survey Division

No abstract provided.

Groundwater Levels In Nebraska, 1977, Michael J. Ellis, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.

The Origin Of Serpentinites Associated With The Shuksan Metamorphic Suite Near Gee Point, Washington, Daniel L. Wilson

WWU Graduate School Collection

Metavolcanic and metasedimentary rocks of the Shuksan Metamorphic Suite near Gee Point have been contact metamorphosed by high-temperature emplacement of ultramafic rock. This intrusion occurred at great depth (>25 km) and caused contact temperatures of about 500°C, resulting in epidote-amphibolite facies metamorphism. Minerals of the contact metamorphism are overprinted by mineral assemblages of the regional Shuksan blueschist facies metamorphism. The K/Ar age of the epidote-amphibolites is Jurassic (145-160 m.y.), and thus the age of Shuksan metamorphism is probably younger than Middle Jurassic.

Ultramafic rocks found near Gee Point have been metamorphosed to serpentinites during Shuksan metamorphism and should be …

The Rhame Bed (Slope Formation, Paleocene), A Silcrete And Deep Weathering Profile, In Southwestern North Dakota, Barbara D. Wehrfritz

Theses and Dissertations

The Rhame Bed is a unit at the top of the Slope Formation (for merly part of the "Ludlow Formation") in the Fort Union Group deposited during Paleocene time.

The Rhame Bed was mapped in western Slope County and north central Bowman County. The bed outcrops on the tops of buttes, at the present groJnd surface in large level areas, or in steep slopes. Although the bed is laterally discontinuous, it is a clearly mappable unit.

The Rhame Bed typically consists of two dominant lithologies: siliceous rock and white sediment. The siliceous rock is hard, gray, and made of silt-sized …

Geology Of The Flathead Formation (Middle Cambrian) On The Perimeter Of The Bighorn Basin, Beartooth Mountains, And Little Belt Mountains In Wyoming And Montana, Joel A. Degenstein

Theses and Dissertations

The Flathead Formation, which is 4 to 60 metres thick in the middle and northern Rocky Mountains of Wyoming and Montana, contains cross-bedded and parallel-bedded, quartz sandstone. The formation contains marginal-marine and shallow-marine sediment that was deposited unconformably on Precambrian crystalline and sedimentary rock by an eastward-transgressing sea during middle Cambrian time.

This field study of the Flathead Formation on the perimeter of the Bighorn Basin, Beartooth Mountains, and Little Belt Mountains reveals that the formation consists of three intervals. The lower interval contains medium to very coarse, pebbly, cross-bedded sandstone and conglomerate. The middle interval contains medium to coarse, …

Petrology Of Sandstones From The Bullion Creek And Sentinel Butte Formations (Paleocene), Little Missouri Badlands, North Dakota, Mark A. Steiner

Theses and Dissertations

The mineralogy and petrology of sandstones of the Paleocene Bullion Creek and Sentinel Butte Formations were studied from exposures in the Little Missouri River Badlands in Billings, Golden Valley, and McKenzie Counties, North Dakota. Field work was conducted in the summer of 1977. Stratigraphic sections were measured and described from eight localities. Sandstones were sampled at 47 levels, and three samples were collected from each level. Fifty-one samples were collected from the Bullion Creek Formation and 90 from the Sentinel Butte Formation.

Thin-sections were prepared from plastic grain-mount blocks containing disaggregated sand grains, and 200 points per thin-section were counted, …

Depositional And Paragenetic Controls On Porosity Development, Upper Red River Formation, North Dakota, Kipp W. Carroll

Theses and Dissertations

The upper Red River Formation in North Dakota comprises a subtidal/intertidal facies overlain by three evaporitic sequences of four lithologic units each, labeled "P," "R," and "F" in stratigraphic order. Four porosity zones are recognized in the upper Red River: the subtidal/ intertidal facies forms one porosity zone, and each evaporitic sequence contains another. Each unit in a sequence, as well as the sequence itself, is thinner and less widespread than its preceding counterpart. All strata are laterally continuous across the main part of the Williston basin in North Dakota, but, the porosity zones eventually disappear to the east as …

Paleoecology Of A Late Quaternary Biota At The Mcclusky Canal Site, Central North Dakota, Linda E. Okland

Theses and Dissertations

Abundant and well-preserved Late Quaternary fossils were exposed at the McClusky Canal Site in the Missouri Coteau district of central North Dakota during the late summer and fall of 1976. Strati graphic units, in ascending order, are: (l) pebbly, clayey sand; (2) unlaminated, organic claystone; (3) laminated, organic claystone; (4) pebbly, sandy claystone; (5) laminated, organic claystone; (6) gypsiferous claystone; and (7) silty claystone. Units 1 and 4 are inter preted to be till, and the remainder are lacustrine sediments. Total thickness of the section is 6.0 m.

Radiocarbon dates of 12,595 ± 375 radiocarbon years B.P. (from the boundary …

Ua66/8/3 Annual Report, Wku Geography & Geology

WKU Archives Records

No abstract provided.

Nebraska Groundwater Level (Decline & Rise) And Location Of Registered Wells, 1978

Conservation and Survey Division

No abstract provided.