Journal
PERMAFROST AND PERIGLACIAL PROCESSES
Volume 18, Issue 1, Pages 49-59Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ppp.572
Keywords
Pleistocene; permafrost; landscape modification; southern New Jersey; USA
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Frost fissures, filled with wind-abraded sand and mineral soil, and numerous small-scale non-diastrophic deformations, occur in the near-surface sediments of the Pine Barrens of southern New Jersey. The fissures are the result of thermal-contraction cracking and indicate the previous existence of either permafrost or seasonally-frozen ground. The deformations reflect thermokarst activity that occurred when permafrost degraded, icy layers melted and density-controlled mass displacements occurred in water-saturated sediments. Slopes and surficial materials of the area reflect these cold-climate conditions. Optically-stimulated luminescence permits construction of a tentative Late-Pleistocene permafrost chronology. This indicates Illinoian, Early-Wisconsinan and Late-Wisconsinan episodes of permafrost and/or deep seasonal frost and a Middle-Wisconsinan thermokarst event. Copyright (C) 2007 John Wiley & Sons, Ltd.
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