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Slumping in the Souris Valley Below Wawanesa, 1945 photo
In the area of Wawanesa, the meandering Souris River has incised itself down through surficial glaciofluvial and glacial deposits into the underlying Cretaceous shales. These two photographs illustrate the value of sequential air photos (photos taken of the same area at different times) in documenting changes even in the case of relatively slow changes such as those caused by geomorphological processes.
a) 1945 photo: Incised meanders of the Souris River can be seen with river cliffs on the outside 1 and slip-off slopes on the inside 2 of bends. Lateral erosion by the river has resulted in slumping at two locations 3, but east of Wawanesa the south bank 4 appears to be stabilized by thick woodland.