This is a specimen of a material I collect regularly. I do not find it in many places, but when I do, I find enough to fill my backpack. It is very hard, and overflowing with visual detail.
A Curious Layman's Approach to the Local Geology
Sunday, November 17, 2013
Friday, September 27, 2013
Tuesday, September 24, 2013
Sunday, September 15, 2013
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