| Abstract: | Sand-wedge casts, soil wedges and other non-diastrophic, post-depositional sedimentary structures suggest that Late-Pleistocene permafrost and deep seasonal frost on the Mid-Atlantic Coastal Plain extended at least as far south as southern Delaware, the Eastern Shore and southern Maryland. Heterogeneous cold-climate slope deposits mantle lower valley-side slopes in central Maryland. A widespread pre-existing fragipan is congruent with the inferred palaeo-permafrost table. The high bulk density of the fragipan was probably enhanced by either thaw consolidation when icy permafrost degraded at the active layer-permafrost interface or by liquefaction and compaction when deep seasonal frost thawed. ?? 2009 John Wiley & Sons, Ltd. |
| Genre: | Article |
| ProdID: | 70036818 |
| Citation Author: | French, H.; Demitroff, M.; Newell, W. L. |
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| Citation End Page: | 294 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Permafrost and Periglacial Processes |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Past permafrost on the Mid-Atlantic coastal plain, eastern United States; 2009; Article; Journal; Permafrost and Periglacial Processes; French, H.; Demitroff, M.; Newell, W. L. |
| Citation Start Page: | 285 |
| Citation Volume: | 20 |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Past permafrost on the Mid-Atlantic coastal plain, eastern United States; 2009; Article; Journal; Permafrost and Periglacial Processes; French, H.; Demitroff, M.; Newell, W. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1002/ppp.659 |
| Date Other: | Thu, 1 Jan 2009 00:00 -0600 |
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