Finding Clues to the Past

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My sister and I walk around our neighborhood in Richmond and El Cerrito, California, and find clues to the past: a section of a creek running open and not in a pipe through houses; a native bunchgrass (purple needlegrass) hanging on as a relict in an empty lot.

Walking around San FGrancisco one day, we saw street construction, and sand under the pavement! Evidence of the former sand dunes.