NORTH DAKOTA STATE UNIVERSITY - FARGO, N D


ICE THRUST MASS IN GRIGGS COUNTY, N.D.



Click on the photo for an enlarged image. (56K)

Under certain conditions, advancing glaciers were able to incorporate large plates of bedrock or frozen earth material. Some of these plates were moved (thrust) just a short distance down ice, where they were deposited.

Such ice-thrusted masses are common features on the North Dakota landscape. The plates, themselves, are often not directly visible, as they may be buried by other drift materials. Their source area, however, can usually be seen as an enclosed depression in the landscape just "up-ice" from the mass.

The hills in the distance were thrust from the depression now occupied by this lake near Binford, N.D.

(Photo by John Bluemle, North Dakota Geological Survey).



[ Glacial Landforms of North Dakota ]