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《Chinese Journal of Geology》 1978-03
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SEDIMENTARY ENVIRONMENT AND STRATIGRAPHICAL SUBDIVISION OF SJARA OSSO-GOL FORMATION

Yuan Baoyin  
A suite of specimens from the Quaternary of the Dagouv/an area along the Sjara Osso-Gol river has been analyzed for sporo-pollen content, water soluble salt and gra-nulometric composition. Basing upon the laboratory data and the studies of faunas and palaeoliths found from this region, this paper proposes to divide the past Sjara Osso-Gol formation into three parts.1. The Lower Sjara Osso-Gol formation consisting mainly of lacustrine deposit formed under mild climatic condition, middle Late Pleistocene in age.2. The Upper Sjara Osso-Gol formation comprising mainly alluvial deposit accumulated under dry-cold climatic condition, upper Late Pleistocene in age.3. The Dagouwan formation - made up mainly of lake-swamp deposit laid down in warm humid climatic environment, Early Holocene in age.Judging from the age of these units the lower and upper Sjara Osso-Gol may be considered as being synchronous with the Malan loess but they are of different facies.
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