UDPG currently has active programs of field research in northern Alaska and the Appalachian Highland of the eastern USA. Work in Alaska is centered on detecting and monitoring spatial patterns of frost heave and thaw subsidence. In cooperation with Professor S.W.S. Millar (Syracuse University) UDPG personnel are involved in studies of clast macrofabric in periglacial colluvium at locations in central Alaska, the Colorado Front Range, and upstate New York (Millar, S.W.S. and Nelson, F.E., 2001). A recent focus involves paleo-periglacial studies in eastern North America; studies completed to date include stratigraphic analysis of fossil frost wedges in northern Delaware (Lemcke, 2001) and the distribution, altitudinal trends, and climatic affinities of relict blockfields in the Appalachian Highlands (Walegur, Gregg, and Nelson, 2000).