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Past permafrost on the Mid-Atlantic coastal plain, eastern United States

Permafrost and Periglacial Processes

By:
, , and
DOI: 10.1002/ppp.659

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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.

Additional Publication Details

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