Sedimentary environments and genesis of edgewise limestones:An example from the Lower Ordovician Yeli Formation in the Ordos Basin

The sedimentary strata in the Lower Ordovician Yeli Formation,Liulin,Ordos Basin dominantly consist of light grey medium-to thin-bedded muddy dolostones,with well-developed edgewise carbonate rocks.These edgewise limestones have experienced two stages of formation,including the deposition of sediments in the early stage,and then fracturing,transport and redeposition of the sediments.