Thursday, August 31, 2017

Mining the Skull Valley Tuff

Here is a post on the Pozolan which could be mined in Skull Valley

Arizona Geology post

Harry Allen

Thursday, February 16, 2017

Grand Falls are flowing

Photos from Daryl and Karen Austermiller's flight over the falls. Note the black lava damn that caused the Little Colorado River to flow around it and form the falls as it returned to its former river bed.

Harry Allen