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1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, and 2000. California Geological Survey. This polygon shapefile depicts geologic units including sand, silt, gravels, alluvium and colluvium deposits within the Albion River watershed in M... California Geological Survey.