CGRG Bibliography of Canadian Geomorphology
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Author : Gambier, A.M.
Date : 1984
Title : Glacigenic streamlined landforms in the Hinton/Edson area, Alberta
Publication : Unpublished M.Sc. thesis. University of Alberta, Edmonton
Issue :
Page(s) : 134 pp
Abstract
Drumlins and other flutings are widespread in the Hinton/Edson area. The orientation of these streamlined forms is approximately 40 -220 . This trend follows the Athabasca River valley and presumably parallels the former flow direction of ice close to the valley centre. Ice moulded landforms to the east illustrate deflection of former ice flow, first eastwards and then southwards. This deflection is attributed to confluence of the Laurentide Ice Sheet and Cordilleran piedmont ice when the landforms were formed. Forestry road cuts have exposed sections through three streamlined landforms in the vicinity of Canyon Creek, ten kilometres northeast of Hinton and these forms have been investigated intensively. Diamicton is the dominant material exposed but numerous stratified layers reveal a complex internal structure. Thrust blocks and overturned folds are well displayed in one fluting, indicating that the sediments of the proximal part of this form have undergone stacking by shearing and overfolding. It is proposed that a transverse feature similar in origin to a Ribbed or Rogen moraine, acted as a nucleus for fluting formation and that the fluting resulted from subsequent lee-side agglomeration of debris-rich ice behind this obstacle. Final till deposition occurred by melt out. The importance of melt out processes to the final preservation of drumlins and flutings in the Hinton/Edson area is evident from observations of two other streamlined forms. Two-dimensional and three-dimensional fabric patterns illustrate the complexity of fabric orientations within each form and raise questions concerning the role of fabric analyses in the evaluation of genetic processes.
Bibliography of Canadian Geomorphology