Classification and genetic analysis of ripple marks on Yunmengshan Formation of Yuntaishan world geopark, Henan province

Abstract：Neoproterozoic Yunmengshan Formation is widely distributed in Redstone gorge of Yuntaishan world geopark, Henan province.Abundant ripple marks were found in strata of the Formation.The research results indicates that the ripple marks of Yunmengshan Formation are dominated by small current and wave ripple marks with minority interference, scalped and bimodal ripple marks.From bottom to top of Yunmengshan Formation, the ripple marks gradually change from rectilineal, asymmetrical current ripple marks into sinusoidal, symmetrical wave ripple marks, which reveals that sedimentary environments of the strata become deepening upward from very shallow foreshore to shallow shoreface environment.

Keyword：Yuntaishan world geopark;Yunmengshan Formation;ripple mark;genetic analysis;