During Early Sinian Nantuo Stage

three sets of incompleted glacial advance glacial recession sedimentary cycles composed of glacial drift and aqueoglacial facies developed in the eastern Yangtze Gorges.In 1980s

the sediments that were glacigenous or acryogenic had once been the point at issue.But that the section of Nantuo Formation in Wangfenggang has no debris flow sedimentary structure

two wine tillite beds only reflect the enriching pattern of the origenal component of glacial till before the formation of glacier but not the mark of hort paleoclimate.According to the facts that no marine intercalated bed

no wave and tidal flow structures could be foundin the Nantuo Formation drift sheet

and rapid lateral changes could be found there

the sediments of the study area are suggested to be continental glacial sediments of low latitude and low altitude ice sheet type.This could be interpreted by global glacial ring model.