earthstory: jasontylerburton: Devil’s Postpile National Monument. Don’t let this one pas
earthstory: jasontylerburton: Devil’s Postpile National Monument. Don’t let this one pass by as you plan your NPS centennial #findyourpark summer road trip! @goparks See all the lines on the surface in the last photo? Those are actually scours created by glaciers. -- source link