Pleistocene Man at San Diego

25 feet alluvial cover alluvial fan alluvium artifacts beach ridge bench beneath brown California cemented charcoal clay loam claypan cliff coastal cobble color core Crown Point culture deposition depth dune east edge Eocene erosion evidence exposed Figure flake scars glacial granite gravels gully hardpan hearths Hertlein and Grant horizon Huerhuero soil humid inches interglacial lagoon lime accumulation Linda Vista loam lower terraces mano mapped marine metate miles Mount Soledad occupation Otay overlying Pacific Beach percussively period Pleistocene Pliocene Point Loma porphyry present profile development quartzite rainfall record remnant rock San Diego area San Diego Bay San Diego River San Dieguito sand ridges sandstone sandy loam Santa Rosa Island Scripps sea level sea stand sequence side silty soil profile soils developed stone strata stratum strongly weathered suggests Sweetwater River Texas Street thick Torrey Pines Mesa truncated upper valley fill Wisconsin zone