Pleistocene Geology of the Grondines Map-area, Quebec
Description:... The Grondines map-area is on the northern edge of the St. Lawrence Lowland and includes some of the Laurentian Upland. The boundary between the upland and lowland is a fault, known as the St. Prosper Fault, which nearly bisects the area from northeast to southwest ... The areal distribution of deposits was mapped chiefly by the use of 2 1/2 inch auger holes four feet deep spaced every half mile along all accessible roads, and, in a few cases, along foot traverses. Closer spacing of the holes was sometimes necessary to locate boundaries. Good air photographs of the area, supplied by the Royal Canadian Air Force, were of great aid in projecting boundaries between observation points. Stratigraphic information was obtained from the study of natural exposures along river banks and of artificial exposures in road cuts, ditches, quarries, and gravel pits.
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