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o C <br /> mT Thickness Rock Characteristics and <br /> System Series Formation Location (feet) Environment Hydrogeologic Description <br /> cCn <br /> O <br /> W Continental unconsolidated gravel,course High permeability,unimportant to <br /> m <br /> M C/) Recent <br /> Channel Deposits Eastside&Westside to medium sand deposited along present groundwater except as avenue for 0) <br /> Recent <br /> Q) Q) n stream channels. percolation. y <br /> Z 0 <br /> C ` Continental fan deposits-heterogeneous, Moderate to locally high permeability, <br /> Quaternary Alluvial Fan Deposits Westside 0 to 150± <br /> discontinuous mixtures of gravel silt&clay. unconfined aquifers. <br /> Late to Pleistocene Cr O <br /> Oz Continental fan and interfan material, <br /> C) Recent Alluvium and Victor Eastside 0 to 150± locally some basin type. Lenticular gravel, Moderate permeability,unconfined aquifers. W <br /> CD sand,silt,&clay <br /> `G CD 0) <br /> rt <br /> `C Plio-Pleistocene Continental basin equivalent of Laguna, Generally low permeability,saturated <br /> Flood Basin Deposits Eastside&Westside 0 to 1400± Tulare,and younger formations. Clay,silt, rt <br /> environments,unconfined to confined. <br /> o <br /> ty � <br /> B Continental semi-consolidated clay,sands, Q <br /> CD <br /> Moderate permeability,generally unconfined 3 <br /> Tertiary Tulare Westside 0 to 1400± &gravel. Contains Corcoran Clay above Corcoran Clay,confined below. C7 <br /> Mio-Pliocene member. 0) <br /> Continental,semi to unconsolidated silt, O_Moderate permeability,unconfined to locally <br /> (0 Laguna Eastside 0 to 1000± sands,&gravel poorly sorted,include semi-confined. Restricted perched bodies in 0 <br /> Arroyo Seco gravel pediment of some areas 3 fn <br /> Upper Miocene Mokelumne River area. C F <br /> Continental andesitic derivatives of silt, Moderate to high permeability,where"black In G) <br /> Merhten Eastside 0 to 600± sand,&gravel&their indurated sands"occur. Confined to unconfined. Cn O <br /> equivalents;tuff;Breccias;agglomerate. Saline west of Stockton. <br /> C Q <br /> Miocene Continental to marine massive sandstone Low permeability. Saline in part. Essentially O <br /> Cretaceous San Pablo Group Westside 0 to 1000± &shale. Westside equivalent to Merhten& non-water bearing except along fractures& Ot' <br /> Valley Springs formations,in part. joints. 0 O <br /> 1 <br /> 3 <br /> Continental to marine rhyolitic ash,clay, Low permeability. Saline in Stockton area. n 0) <br /> Valley Springs Eastside 7 to 500± Not considered significant in groundwater O z <br /> Eocene sand,gravel&their induriated equivalents. studies. 0) <br /> CD <br /> Contains saline waters except where flushed a <br /> Eocene Undifferentiated Westside ? Marine shale,siltstone,&sandstone. in outcrop areas. Unimportant to freshwater CDCD <br /> basin except as possible contaminant source. <br /> Cretaceous <br /> = Contains saline waters,unimportant to <br /> Jurassic Cretaceous Undifferentiated Westside ? Marine shale,siltstone,&sandstone. freshwater basin except as possible <br /> Q contaminant source. <br /> O Cn <br /> CD CD <br /> Jurassic <br /> CD 0 c� Marine shale,sandstone,chert Unimportant to freshwater basin except as <br /> () EFranciscan Undifferentiated Westside ? <br /> 0• metamorphica,serpentine. possible contaminant source. <br /> O � <br /> `C N <br />