1. RedDerek
    RedDerek November 15, 2016 at 7:10 am

    There is another similar formation out side of Chico on the way to the north trail entrance of Hartman Bar. I would be glad to send a picture of it as part of response.

  2. Carlos Zenteno
    Carlos Zenteno November 16, 2016 at 6:40 am

    We have some outside the town of Huasca, state of HIdalgo in Mexico. They have a boring but geological name. “Los Prismas Basalticos” == Basaltic Prisms. They have a waterfall that goes thru them !! https://www.google.com/search?q=prismas+basalticos+mexico&newwindow=1&biw=1472&bih=840&source=lnms&tbm=isch&sa=X&ved=0ahUKEwikqLS-2q3QAhXBr1QKHaa5Cj4Q_AUICCgB

  3. Steve Herr
    Steve Herr November 17, 2016 at 3:09 am

    I’m also aware of Devil’s Tower and some columnar basalt in the Columbia River Gorge in Washington. Are there any other examples in the US?

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