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Study of Periglacial Wedge-Shape Structures in Eastern Qinghai Plateau

Xu Shuying  
Based on the field investigations and cardon 14 data, this paper describes Characteristics, type, formative age and environment of periglacial Wedge-shape structures in Eastern Qinghai Plateau. The Perig-lactal structures include ice Wedge casts, sand wedges and composite Wedge casts. TWO main periods of periglacial Wedge-shape structures formation are indicated during the last stage of late Pleistocene : 33,000 to 20,000 yr. B. P. and 15,000 to 10,000 yr. B. P. Based on analysis of spore-pollen and grainspe of interior filler, aeolian sand and loess deposits, evolution of lakes, the Climatic of periglacial wedge-shape structures formation are indicated cold and dry than present.
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