teng ge li sha mo dong nan yuan wan di san ji gu feng cheng sha ji qi huan jing
Yan Mancun Dong Guangrong Tao Zhen Tu Zhen Analytical results of stratigraphy;sedimentary structure;grain size;quartz sand microtextures;fauna;pollen spore etcrevealed that there has been a series of eolian processes from sand transportation to accumulation by wind during the Neogence period;which are similar to that of today in the southeastern marginal Tengger Desert. In addition;a great number of calcareous crusts and nodules in eolian sand dunes showed that the climate in the area at that time were dry and hot;with an obvious fluctuations of arid and humid climate;and the bioclimatic zones shifted from the spare wood steppe of Sub-trotropic zone to desert steppe.
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