Wednesday, June 6, 2012

Columnar jointing in basalt





Not sure, but I think sign said these were ~150000 year old basalts.  Columnar joining formed after cooling of sheet basaltic lava flow.

1 comment:

  1. Hi Joel and Connie
    It was great to meet you both at Norris Geyser Field! We are in Jackson Hole at the moment going to see the experimental breeder reactor tomorrow at Atomic City we hope - John is a nuclear physicist so he's really excited. Enjoy the rest of your trip! Stella

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