Devils Lake, North Dakota
Upper photo: View from west to east with Sullys Hill on horizon to right (south)
and part of Devils Lake visible to left (north). Sullys Hill rises about 200
m above the floor of Devils Lake. The forested hill is composed of bedrock
(shale) and sediment thrust out of the lake basin.
Photo date 7/91; © by J.S. Aber.
Lower photo: View from top of Sullys Hill looking northward across Devils
Lake (Main Bay). The basin and hill represent a very large and well formed
hill-hole pair, which was created by ice thrusting over the Spiritwood aquifer
that runs beneath the lake basin. Photo date 7/91; © by J.S. Aber.
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