Show simple item record Brooks, David Richard John en_US 2012-05-10T21:13:51Z 2012-05-10T21:13:51Z 1968 en_US
dc.identifier ocm72753828 en_US
dc.description.abstract The fact of the diversion of the Souris River from the Pembina Trench across the Tiger Hills is well known, but when and why this happened has not been clarified. The main objective of this essay is to answer these two questions. A brief survey of the surficial deposits, especially their relation to the preglacial bedrock topography, and a review of the evidence for the diversion are made. Two means of diversion, other than the process of capture, are considered. A critical line of enquiry as to the time and cause of the diversion proved to be the chronology of events in that section of the Souris Valley north of the Tiger Hills. It was found that diversion occurred earlier than was formerly believed, perhaps as early as glacial Lake Brandon, but, in any case, very early in the history of glacial Lake Agassiz I. A lowering of the level of the latter was evidently not required in order to initiate headward erosion of a tributary of the Assiniboine, if capture were the process involved. Circumstances were such that capture was distinctly possible and in the writer's opinion the balance of evidence actually swings slightly in its favour. The chronology of the Souris Valley also has application to post-glacial variations in discharge and present underfitness, as well as rates of river cliff recession and the operation of geomorphological processes. en_US
dc.format.extent xi, 128 p. : en_US
dc.language en en_US
dc.rights en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title A geomorphological study of the lower Souris River valley, Manitoba, with special reference to the diversion en_US
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US Geography en_US

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