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♦r .. <br /> mas <br /> TABLE 1 GENERALIZED STRATIGRAPHIC COLUMN OF SAN JOAQUIN <br /> COUNTY WITH WATER BEARING CHARACTERISTICS <br /> - <br /> Ser it. Formation Location Rock Characteristics Vater-Bearing <br /> 6 Thickness and Environment Propert La• <br /> Map Symbol Maximum (ft <br /> Recent Stream Channel Vest.ide Continental unconsolidated gravel. High permeability, Unimportant to <br /> Deposita Eastside and coarse to medium aaod deposited ground water except as avenue for <br /> (Qsc) along present stream channels. percolation to underlying fms. <br /> Recent Alluvial Fan Westside Continental fan deposits-hetero- Moderate to locally high permea- <br /> to Late Deposita ( 0-150=) geneous, discontinuous mixture& bLlities. Unconfined aquifers. <br /> Pleisto- (Qal) of gravel, eared, •fit, clay. <br /> cane <br /> Recent Alluv- Eastsida Continental fan and interfere Moderate permeabtlitiem. Uncon- <br /> tum and Vic- (0-150±) material, locally some basin fined aquifers. <br /> for (Qa1v) types. Lenticula, gravel, ..ad, <br /> silt, clay, <br /> — Recent Flood Basin Westside Continental basinal equivalent of Generally law perneabilit Les, <br /> to Pllo- Deposita (Qb) Eataide La urea, Tulare 4 younger fm, saturated environment, uncon- <br /> cene )-1400- Clay, •Lit 6 sand, organic in part. fined to confined. <br /> me Pllo-Plel• Tulare Vesta Lde Continental •emiconsolidated clay, Moderate permeability, generally <br /> tocene (QTC) 0-1400'- and, gravel. Contains Corcoran unconfined above Corcoran Clay <br /> Clay Member, confined below Corcoran Clay. <br /> Plio-Ple L• Laguna Eaat•Lde Continental, semL-to uncooaolida- Moderate permeability. Uncon- <br /> facene (QT1) 0-1000t ted sLit, and 6 gravel; poorly fined to locally eml-confined. <br /> sorted, includes Arroyo Seco Gra- Restricted perched bodies in <br /> vel pediment of l keluam R. area. &oma areas <br /> .� <br /> Mia- Mehrten Eastside Continental andes(t Lc derivatives Moderate permeability to high <br /> Pliocene (Tm) 0-600- of milt, and and gravel 6 their where '*Black Sends" occur. Con- <br /> indurated equivalent.; tuff; fined to unconfined. SALE. west <br /> Breccia; agglomerate. of Stockton. <br /> Upper San Pablo Veatslde Continental to marine massive Lou permiability. Saline in part. <br /> Miocene Croup (Tsp) 0-10001 sandstone and shale. Westside Essentially nonwater bearing except <br /> equivalent of Mehrten and Valley along fractures and joints. <br /> Spring. fine. Ln part. <br /> Miocene Valley Springs Eastside Coati nental to marine (t) rhyo- Lw, permeability. Salina in Stockton <br /> (Two) 0-500- lltic aah, clay, and b gravel and area. Mot considered as significant <br /> their indurated equivalent.. in ground water stu.'Les. <br /> Eocene Eocene Wests Lde Marine shale, •ilt.tone and send- Contains ..line .*term except where <br /> — Undtfferen- t atwaa. flushed in outcrop areas. Unimport- <br /> ti&t!d (Te) ant to fresh water basin except as <br /> possible contaminant source. <br /> — Creta- Cretaceous Westside Marine shale, siltatooe and sand- Contains aline .*tars. Unimportant <br /> ceoua Und Lfferen- t stone. to fresh water basin except as poss- <br /> tiated (K) ible contaminant source. <br /> Jurassic Franciscan Westside Marine •hale, sandstone, chert Unimportant to fresh water basin <br /> — Group, UadLf- t metamorphicB, serpentine. except as possible coatamtnamt <br /> ferentiated <br /> &OV[C!. <br /> MALE: Areal distribution and configuration <br /> of these formAtion• are show on Plates 2A, 2B <br /> adstermL..te in Outcrop <br /> l <br />