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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Viewing Half Dome from the Great Valley

Once or twice a year the air clears in the Great Valley. Our valley as great as it is, is a closed basin. The Sierra Nevada and Coast Ranges make it hard for air pollution and dust to move out of the region, and as such the cities of the San Joaquin Valley (south of Stocton) often appear on the top ten "most polluted air" lists. On those few clear days, my eyes drift east towards the Sierra

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