Utah sunstone

This month I was working with “sand” that was actually too large to be technically called sand.   Rather the grains were granules, the finest size fraction of gravel.   I had obtained 200ml samples of four different gravels from Ed Tindell, a Texas collector, trading him gravels from northeast locations I had visited.   One of my new samples was from Sunstone Knoll in Millard County, Utah.  The gravel had accumulated in the alluvium shed from adjacent Sunstone Knoll.  Ed had size-sieved a large sample and the material he sent me was from the 1/16” to 1/8” (1.7-3.2mm) size range, bridging the upper limit of sand, but mostly fine gravel or granules (see chart at the end of the article).

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