Just a quick post, to get my bloggin' legs back after fall field work/GSA madness! Here's photographic PROOF that not all red rocks in Wyoming are from the triassic; these are from the Eocene strata of the alluvial/fluvial Cathedral Bluffs, in SW Wyoming. Behold!
Take a look at the variably expressed soil forming processes preserved in the stratigraphic record, as well as the subtle channelform! Nifty, huh!?!