Sedimentary environment and petrological features of organic-rich fine sediments in shallow water overlapping deposits: A case study of Cambrian Yuertus Formation in northwestern Tarim Basin, NW China

JIN Zhimin,TAN Xiucheng,TANG Hao,SHEN Anjiang,QIAO Zhanfeng,ZHENG Jianfeng,LI Fei,ZHANG Shixuan,CHEN Lei,ZHOU Chenggang

Fig. 5. Thin shale and limestone interbeds. (a) Thin shale and limestone interbeds. The length of the yellow arrow reflects the shale thickness, Sugaite section; (b) Siderite nodules and limestone lens in shale; (c) Thin-layered limestone with typical reverse grading of particles; (d) -(f) micrographs showing granular limestone with decreasing grain size, plane-polarized light.