Past permafrost on the Mid-Atlantic coastal plain, eastern United States
Permafrost and Periglacial Processes
By: H. French, M. Demitroff, and Wayne L. Newell
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Past permafrost on the Mid-Atlantic coastal plain, eastern United States |
| Series title | Permafrost and Periglacial Processes |
| DOI | 10.1002/ppp.659 |
| Volume | 20 |
| Issue | 3 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Permafrost and Periglacial Processes |
| First page | 285 |
| Last page | 294 |
| Google Analytic Metrics | Metrics page |