1. Mazur M.J., Stewart R.R., Hildebrand A.R., Lawton D.C., Westbroek H.-H. (1999). Seismic characterization of impact craters: A summary // CREWES Research Report - Volume 11
  2. Jarmo Moilanen (2009). Impact Structures of the World.

Рельеф из Wikimapia.

The White Valley structure in southwestern Saskatchewan has been interpreted as a <75 Ma old impact feature. (Westbroek, 1997; Mazur M.J., 1999)

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