Core photos demonstrating sedimentary characteristics of rocks. (a) HH105 well, Chang 812, 2262 meters, fine sandstone of parallel bedding, high-angle fracture. (b) HH49 well, Chang 812, 2283 meters, mud gravel at the bottom of the sandstone, erosion surface. (c) HH105 well, Chang 812, 2259 meters, fine sandstone with coal line.
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