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Geologic Information <br />The previous page shows USGS geology information. Detailed information about each unit is provided below. <br />Geologic Unit Q <br />Unit Name: <br />Unit Age: <br />Primary Rock Type: <br />Secondary Rock Type: <br />Unit Description: <br />Geologic Unit QPc <br />Unit Name: <br />Unit Age: <br />Primary Rock Type: <br />Secondary Rock Type: <br />Unit Description: <br />Quaternary alluvium and marine deposits <br />Pliocene to Holocene <br />alluvium <br />terrace <br />Alluvium, lake, playa, and terrace deposits; unconsolidated and semi - <br />consolidated. Mostly nonmarine, but includes marine deposits near the coast. <br />Plio-Pleistocene and Pliocene loosely consolidated deposits <br />Miocene to Pleistocene <br />sandstone <br />conglomerate <br />Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part <br />Miocene. <br />erisinfo.coml Environmental Risk Information Services Order No: 21072801059p <br />