Date of Award
Master of Arts (MA)
Based on lithostratigraphic and geomorphic information, the Quaternary history of an area bounded by the Red River of the North, 95°00' west longitude, 47°00' and 46°45' north latitude in west central Minnesota, includes seven geologic episodes:
Glacial advances and retreats over all or part of the study area occurred during the first six geologic episodes. The glaciers advanced either southward across northern Minnesota, entering the study area from the northeast; or across eastern North Dakota and southwestern Manitoba, entering the study area from the northwest. As a result of these glacial events the sediment of Unit A, Sebeka Formation, New York Mills Formation, Dunvilla Formation, Barnesville Formation, and Hawley Formation (new) was deposited in the study area.
The creation and drainage of Lake Agassiz occurred during the seventh episode, between 13 000 years B. P. to 9 500 years B. P. The sediment deposited as a result of this event is contained in the Sherack Formation, Downer Formation, Argusville Formation, and Poplar River Formation. During this episode, starting about 12 300 years B. P., the present-day streams, bogs, and sloughs were created. The sediment deposited during this event is contained in the Walsh Formation.
Perkins, Roderic L., "The late Cenozoic geology of west-central Minnesota from Moorhead to Park Rapids" (1977). Theses and Dissertations. 225.