Ice‐wedge casts of Wisconsinan age in Eastern Nebraska
Sand‐filled, wedge‐shaped structures beneath a thin layer of aeolian sand penetrate a pre‐Illinoian till and gravel in northeastern Nebraska. Interpreted to be relic thermal contraction crack wedges, they provide the first definite evidence in this State of the former presence of permafrost. The wed...
| Published in: | Permafrost and Periglacial Processes |
|---|---|
| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ppp.3430020305 |