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#siltstone #grey rock #layered rock #sedimentary structure #mudstone

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#shale rock #sedimentary rock #fissility #layered rock #rock layers #thin layers

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#shale #sedimentary rock #layered rock #dark rock #flat rock

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#shale rock #layered rock #sedimentary rock #strata #thin layers

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#schist #metamorphic rock #foliation #layered rock #rock layers