Show simple item record McPherson, Robert A. en_US 2009-12-01T17:06:33Z 2009-12-01T17:06:33Z 1968 en_US
dc.identifier ocm72792952 en_US
dc.description.abstract The Pleistocene sediments exposed along the Winnipeg River from Lake Winnipeg to Seven Sisters Falls can be divided into four sedimentary units. These are, from oldest to youngest, a glacial till, a glacio-lacustrine clay, a glacio-lacustrine mud, and a glacio-fluvial and glacio-lacustrine sandy silt. During Wisconsin time, ice advanced from the Keewatin ice centre situated northwest of the study area depositing a calcareous till. Most of the till was derived from the Paleozoic carbonates of Manitoba. As the ice retreated, Lake Agassiz III, a large glacial lake, inundated the area. Sedimentation in the lake resulted in the deposition of a clay unit consisting mainly of illite and montmorillonite derived from Cretaceous and Jurassic shales. Further recession of the ice opened an eastern drainage outlet and the lake level dropped subjecting the clay to subareal erosion. An ice advance from the northeast Patrician ice centre blocked eastern drainage and Lake Agassiz IV came into existence. As the lake level rose, a mud unit consisting essentially of dolomite grains, quartz grains and clay minerals derived from Paleozoic carbonates, Precambrian granites and Cretaceous shales was deposited. Recession of the ice sheet opened eastern drainage systems and the lake level dropped gradually. A sandy silt unit was deposited in shallow water of Lake Agassiz IV as a result of delta construction and offshore processes. The sandy silt is composed mainly of quartz and dolomite grains derived from Precambrian granites and Paleozoic carbonates. Disintegration of the ice sheet in the Ne1son River basin opened northern drainage. Lake Agassiz was drained to the present level of Lake Winnipeg, the sandy silt was subjected to erosion, and a soil profile developed. en_US
dc.format.extent 61 leaves : en_US
dc.format.extent 8187580 bytes
dc.format.mimetype application/pdf
dc.language en en_US
dc.language.iso en_US
dc.rights The reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner. en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title Pleistocene stratigraphy of the Winnipeg River in the Pine Falls-Seven Sisters Falls area, Manitoba en_US
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US Geology en_US Master of Science (M.Sc.) en_US

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