As one of the most significant structures in sedimentary rocks, bedding is stratified structure formed in strata when sediments deposit. Beddings occur when the composition, structure and color of the sediments as well as the thickness ans shape of the stratum are changed in vertical direction. The thickness of the beddings ranges from millimeters to meters and they transversally extend into a few centimeters or thousands of meters.

　　The outcropped stratum and its beddings here are made up of carbonaceous limestones, which are sedimentary rocks formed in the Cambrian period about 500 million years ago. The later dyke formed in the stratum intruded into the sedimentary rock stratum.