Never been out West - fascinating geology.
I would love to hear how the canyons formed. I can't quite work it out with my limited geology.
I assume very resistant surface layer underlined by very soft layers.
Huge flows or looonnnggg time to erode down leaving the buttes (second picture) and flat valley floor.
I would think the hoodoos in the lower center of third picture would indicate low velocity flows or shallow flows limited to canyon floor. The canyons seem to be following the existing stream network so I would assume they date after the glacier melt.
Or I could be clueless.
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