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Stratigraphy and Geologic History of the Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota
From introduction: This is a progress report on regional stratigraphic and paleontologic studies of the Upper Cretaceous Montana Group and equivalent rocks in the northern part of the western interior of the United States. It presents preliminary data on the positions of strandlines during a 14-m.y. (million year) span of the Late Cretaceous as well as our interpretations of the geologic history of this period.
Date:
1973
Creator:
Gill, James R. & Cobban, William Aubrey
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma-Ray and Magnetic Survey, Final Report. Volume 1: Newcastle and Gillette Quadrangles (Wyoming/South Dakota) and Ekalaka Quadrangle (Montana, South and North Dakota)
The following report is the first in a series of volumes presenting data recorded during the months of August and September, 1978, from a radiometric and magnetic survey taken in four quadrangles between eastern Wyoming, North and South Dakota, and southern Montana (Newcastle, Gillette and Ekalaka).
Date:
April 1979
Creator:
GeoMetrics, Inc.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Digital Model of Ground-Water Flow in the Madison Group, Powder River Basin and Adjacent Areas, Wyoming, Montana, South Dakota, North Dakota, and Nebraska
Abstract: A digital simulation model was used to analyze regional ground-water flow in the Madison Group aquifer in the Powder River Basin and adjacent areas. Most recharge to the aquifer originates in or near the outcrop areas of the Madison in the Bighorn Mountains and Black Hills , and most discharge occurs through springs and wells. Results from the model calculations indicate that the total flow through the aquifer in the modeled areas was approximately 200 cubic feet per second (5.7 cubic metres per second). The aquifer can probably sustain increased ground-water withdrawals probably would significantly lower the potentiometric surface in the Madison aquifer in a large part of the basin. The digital model could better predict the effects of withdrawals if more accurate estimates of the storage coefficient, transmissivity, and leakance could be obtained.
Date:
January 1976
Creator:
Konikow, Leonard F.
Object Type:
Report
System:
The UNT Digital Library
Airborne Radiometric Survey of the Inyan Kara Group of the Black Hills, South Dakota and Wyoming
This report presents the results of an airborne radiometric survey that was made of the Inyan Kara group in the Black Hills of South Dakota and Wyoming between March 5 to December 5, 1952.
Date:
April 3, 1973
Creator:
Yater, A. N.
Object Type:
Report
System:
The UNT Digital Library
[Gillette Quadrangle: Single Record Data Listings]
Single record data listings taken during aerial gamma-ray and magnetic surveys of the Gillette quadrangle in Wyoming and South Dakota.
Date:
April 1979
Creator:
GeoMetrics, Inc.
Object Type:
Dataset
System:
The UNT Digital Library
[Gillette Quadrangle: Average Record Data Listings]
Average record data listings taken during aerial gamma-ray and magnetic surveys of the Gillette quadrangle in Wyoming and South Dakota.
Date:
April 1979
Creator:
GeoMetrics, Inc.
Object Type:
Dataset
System:
The UNT Digital Library
[Newcastle Quadrangle: Single Record Data Listings]
Single record data listings taken during aerial gamma-ray and magnetic surveys of the Newcastle quadrangle in Wyoming and South Dakota.
Date:
April 1979
Creator:
GeoMetrics, Inc.
Object Type:
Dataset
System:
The UNT Digital Library
[Newcastle Quadrangle: Average Record Data Listings]
Average record data listings taken during aerial gamma-ray and magnetic surveys of the Newcastle quadrangle in Wyoming and South Dakota.
Date:
April 1979
Creator:
GeoMetrics, Inc.
Object Type:
Dataset
System:
The UNT Digital Library