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TitleBedrock topography, buried valleys and nature of the drift, Virden map-area, Manitoba
AuthorKlassen, R W; Wyder, J E
SourceGeological Survey of Canada, Paper no. 70-56, 1970, 17 pages (1 sheet),
PublisherGeological Survey of Canada
MapsPublication contains 1 map
Map Info.geological, 1:250,000
Mediapaper; on-line; digital
RelatedThis publication contains Klassen, R W; Wyder, J E; (1971). Virden area, West of principal meridian, Manitoba, Geological Survey of Canada, Preliminary Map no. 14-1970
File formatpdf
Lat/Long WENS-102.0000 -100.0000 50.0000 49.0000
Subjectsstratigraphy; bedrock topography; Boissevain Formation; Riding Mountain Formation; Turtle Mountain Formation; Vermilion River Formation; Mesozoic; Cenozoic; Quaternary
Released1970 01 01; 2013 10 22
AbstractThis report is based largely on field data obtained by sampling and electrical logging some 24,000 feet of drift and bedrock and from the results of surface (DC) resistivity surveys within a 4,000-square-mile area of southwestern Manitoba during the summers of 1967 and 1968. A number of buried valleys of Tertiary and/or Pleistocene ages are filled with 300 feet to 500 feet of drift. The preglacial Missouri Valley can be traced from the Manitoba-Saskatchewan boundary diagonally northeastward across the study area as a broad bedrock depression 30 miles wide and 200 feet deep. A secondary valley (Pierson Valley) up to h miles wide and incised 100 to 250 feet below sea level of the preglacial Missouri Valley, follows the latter except in the southwestern corner of the area where it is continuous to the south with the preglacial Souris Valley of North Dakota. The 1000est bedrock elevations are not necessarily coincident with preglacial drainage channels, for Pleistocene alluvium occurs in the deepest parts of buried valleys. It appears that, in this area, base level during later Tertiary time was probably 100 or 200 feet higher than it was in early Pleistocene time. In the subsurface, the drift comprises mainly multiple tills and intercalated glacial acustrine deposits. Of the drift penetrated in boreholes, about 75 per cent is till, IS per cent is silt and clay and 10 per cent is gravel and sand. Although this investigation does not provide an evaluation of the quality or quantity of ground water in the area, it does provide a general frame work for future groundwater investigations.