The day was windy, but sunny. I had a customer to my shop. He was considerate and called ahead. A pleasant visit. In the fall and winter, rock shop customers tend to be of the online variety. I picked up my book Minnesota's Geology by W. Ojakangas and Charles L. Matsch once again. I left off reading about Wisconsin glaciation, which was the last of the glacial periods and began around 75,000 years ago. Skimming the material, I felt I didn't understand its intricacies well enough (yet) to blog about it.
Last week I was called dumb as a rock in one of my Facebook groups. Or maybe it was more than a week ago. It was a disagreement over nomenclature. When someone is that blunt, I question myself. Am I really dumb as rock? I revisited my birthstone videos. Yes, I could have googled that material and put them together. But that's not what happened. I carry around in my head a lot of facts and ideas. I didn't regurgitate them from a questionable website. Even someone who uses Wikipedia as a primary source has to have some knowledge or interest, to even know where to begin. The quality of those videos is better than I remember them.

Updated: 10/21/14 6:27 PM CDT
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