Page 482
frozen ground, permafrost, contributed to thrusting by acting as a confining layer for the groundwater. We have identified several kinds of ice-thrust features, but the most striking and obvious of those found in North Dakota are the hill-hole combinations like the one at Anamoose. Discrete hills of...
| Language: | unknown |
|---|---|
| Subjects: | |
| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndbb/id/10622 |