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Distribution and Thickness of Devonian Rocks in Williston Basin and in Central Montana and North-Central Wyoming
(UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON, 1961)
The report area includes approximately 200,000 square miles in the southern part of the Williston basin of North Dakota, South Dakota, and eastern Mon- tana and in central Montana and north-central Wyoming. Devonian ...
Geology of the Souris River Area North Dakota
(United States Government Printing Office, Washington, 1960)
The Souris River area comprises about 5,500 square miles in north-central North Dakota. It is bounded roughly by the east loop of the Souris River on the east, by the Max moraine on the southwest, and by the International ...