For which, unfortunately, I have neither a key nor an original source. However, I'm guessing they're from U.S. the Geological Survey's Geologic Map of the United States, 1974, by Philip King and Helen Beikman
This is my bit of a blog. Rambling words about rambling days. No focus and nothing ambitious. I seem to write most about local color, nature, and animals, and there is an incomplete chunk about my road trips of 2011.
Post a Comment