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McMurray Formation
The McMurray Formation is a stratigraphic unit of Early Cretaceous age (late Barremian to Aptian stage) of the Western Canada Sedimentary Basin in northeastern Alberta. It takes the name from Fort McMurray, and was first described in the outcrops exposed along the banks of the Athabasca River, north of Fort McMurray, by F.H. McLearn in 1917.〔McLearn, F.H., 1917. Athabasca River section, Alberta. Geological Survey of Canada Summary Report 1916, p. 145-151.〕 It is a well-studied example of fluvial to estuarine sedimentation, and it is economically important because it hosts most of the vast bitumen resources of the Athabasca Oil Sands region.
==Lithology==
The McMurray Formation consists of fine- to coarse-grained quartzitic sand and sandstone, interbedded with lesser amounts of silt, mud, clay and, less commonly, thin coal beds. The sands are very loose and friable, unless they are partially or fully cemented with bitumen, calcite or, rarely, quartz.〔Glass, D.J., editor, 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada. Canadian Society of Petroleum Geologists, Calgary, Alberta, 1423 p. on CD-ROM, ISBN 0-920230-23-7.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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