Stratigraphic framework of the Xiamaling-Longshan-Jing’eryu formations in the Yan-liao area. See Figure 1c (First figure) for locations and data sources pertaining to the column. (IMAGE)
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The depositional environment and stratigraphic evolution of the Xiamaling Formation to the Longshan Formation, are represented by coarse-fine normal cycle deposits of different grades and thicknesses. Although the middle sedimentary stage of the Xiamaling Formation is dominated by fine-grained sediments in shallow shelf or a relatively euxinic environment, sandstones with different thicknesses are observed. The sedimentary successions and evolution processes from the Xiamaling Formation to the Longshan Formation indicates that the Xiamaling-Longshan formations is the sedimentary product from the peak period of rift extension or continental breakup (Mitchell et al., 2021; Zhang S H et al., 2022). Here, the rift basin changes from deep and narrow to shallow and wide, which is continuous (in time) and expansive (in space).
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