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C – colluvium landslide debris

Colluvium is a mixture of sediment and/or rock that moved by gravity, usually en mass, down a steep slope accumulating at or near the base of the slope. In Manitoba, the primary colluvium occurrences are along the Manitoba Escarpment, glacial spillways and river banks. The largest colluvium deposits, and the only ones visible on this map, are along the Manitoba Escarpment and glacial spillways where sediment and rock slid off wet, slippery shale. Image 9 is a computer-generated image of surface topography along the Manitoba Escarpment. Image 10 depicts the Assiniboine spillway. Spillways are large channels that were cut by glacial drainage. In Image 10, the size of the spillway is compared to the ‘tiny’ modern Assiniboine River. Image 11 shows large slump blocks that slid down the north wall of the Assiniboine spillway. The inset on Image 11 explains the process.

Image 9
Image 9

 

Image 10
Image 10

 

Image 11
Image 11

 

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