Molar-tooth structure and sedimentary characteristics of the Wanlong Formation of Neoproterozoic at Erdaojiang section of Tonghua County in southern Jilin Province;
Various ribbon-shaped molar-tooth structures are developed in the leionite limestones(aphanitic limestones) of the upper part of the succession of the non-stromatolitic carbonate,and lots of spherical or sub-spherical bodies with the sizes from several millimeters to m.