Spearfish Formation

On June 1st I was taken with this colorful bluff of the Belle Fourche [Beautiful Fork] River in Hulett, Wyoming. As far as I can tell, these rock layers are part of what geologists call the Spearfish Formation.

Half an hour later we saw more of it at Devil’s Tower.

Finally, on the way back to the Black Hills, we saw even more along Interstate 90:

I can’t remember if this last place was still in Wyoming or if we’d already crossed back into South Dakota.

© 2017 Steven Schwartzman

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