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ABSTRACT
Two types of periglacial earth hummock are recognized and their stratigraphy is discussed in terms of the origin of organic material contained within them. In one type of hummock this is considered to be derived solely from the soil surface horizon by cryoturbation processes, while in the other type, organic material bruied in situ by sediment derived from upslope erosional processes is also present. Samples of subsurface organic material have been 14C dated in order to investigate the timing of hummock activity. These results are discussed in the context of Holocene climatic change, although only limited climatic inferences can as yet be made.
