I’ve been researching the geology of this canyon and have been finding interesting information about mapping the geology here. In this image is seen: Entrada Formation, Dakota Sandstone, shale (colored bright red by the burning of layers of coal in some lower areas of the strata) and sedimentary rock from millions of years ago.
This link to an abstract of mapping done in 2007 by the US Geological Survey has detailed information:gsa.confex.com/gsa/2007RM/finalprogram/abstract_120763.htm
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