Mudstone rip-up clasts, mud cracks, calcrete, Rhizo concretions, and ... central part of the basin indicate a period of subaerial exposure and weathering. ... There is no sharp distinction between shale and mudstone; one grades into the other.
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Mud cracks in a shale or mudstone indicate
Cambrian age sandstones and shales are exposed around the Mississippi River ... Mud cracks indicate that the sediment was wet but exposed to the air so that it dried ... Sandstones and mudstones dominate the bedrock from these periods, .... Mar 16, 2021 — The following images show sedimentary structures, mud cracks and ripple marks, that indicate a shallow water ... Colorado Group includes the Blackleaf Formation (bentonitic shales mudstones) and Marias River Shale (dark ... 3925e8d270
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