Columns in Yellowstone NP

[MojaveGeek]

I'm sure GowerGulch would have a lot more to say about columnar faulted basalt / andesite, but once you get an eye for it, it can be found in many places.  Much along the roadsides of SW Washington state, on the east side of the Cascades (around Yakima, but really all over the place).    I have seen some great stuff on Rainier.  Devil's Postpile is classic (near Mammoth, CA).  There is also a "Little Devils Postpile" in the Sierra near Tuolomne Meadows that I hope to walk to this summer - I was very close last year, climbing a nameless dome, but I did not know about the formation at the time.  I've also seen some nice samples in SW Utah.   Photo from Mt. Rainier, en route to Emerald Ridge.