Sedimentological and geochemical evidence of Early Permian coal accumulation patterns linked to paleoclimate: Example from the Liujiang Basin, North China - Kai Zhou; Minfang Yang; Shuo Zhang; Ran Gao; Zhiming Yan; Peixin Zhang; Lei Wang; Haoqing Liu; Xiaowei Liu; Longyi Shao; Jing Lu (Marine and Petroleum Geology, 2025)