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r M <br /> QrFi2 . — �Qrn2 <br /> per, <br /> r Qm1?, Q`Qha <br /> m M�4 <br /> 1 Qr2a o <br /> ©l Q, Q <br /> Ql,ltta" �3 <br /> Qm2 �° Fds Q= <br /> m1? I <br /> ?•,,. 4Qm1 I <br /> 1 . <br /> V2 <br /> . <br /> Qrri2'• <br /> La <br /> am Q�'f U f <br /> m2f t :�iF3f QQtI <br /> Source:Marchard,D.E.and Bartow,J.A.,1979,Preliminary Geologic Map of Cenozoic Deposits of the <br /> Ballots Quadrangle,California:U.S.Geological Survey Open File Report OF-79-664,Scale 1:62,500. <br /> GEOLOGIC MAP OF SURFACIAL DEPOSITS <br /> LOCKEFORD AREA <br /> EXPLANATION: <br /> One- HOLOCENE ALLUVIUM--Channel and levee deposits <br /> Qu-UNDIFFERENTIATED ALLUVIUM AND COLLUVIUM <br /> MODESTO FORMATION Scale 1:62,500 <br /> --upper member includes: 1 in =0.986 mi <br /> Qm2- arkosic alluvium forming Mokelumne River terraces and alluvival fan;chiefly = 5208 ft <br /> sand with minor gravel and silt; probably glacial outwash <br /> —Qm2f- foothill-derived alluvial silt, clay,and minor sand forming terraces, upper fans, <br /> and following distributaries across lower fans;abundant volcanic detritus <br /> Qm2e-arkosic sand forming low dunes on the Mokelumne River fan; probably eolian, <br /> although not well sorted <br /> --lower member includes: <br /> — Qmt- arkosic alluvium forming Mokelumne River terraces and alluvial fan; chiefly <br /> sand; probably glacial outwash <br /> RIVERBANK FORMATION <br /> _ --upper unit includes: <br /> Qr3- arkosic alluvium forming Mokelumne River terraces and alluvial fan; chiefly sand; °a•s <br /> probably glacial outwash °,• <br /> Qr3f- foothill-derived alluvial sand and silt; contains abundant volcanic detritus <br /> NEIL O.ANDERSON &ASSOC.,INC. <br /> --middle unit includes: ceo�axrxaeavw�s-E«G.�«G��.°wEs z A <br /> —Qr2- arkosic alluvium forming Mokelumne River terraces and alluvial fan; chielfy sand; <br /> probably glacial outwash <br /> Qtl- TURLOCK LAKE FORMATION--arkosic alluvium, probably glacial outwash in Plate 6 <br /> part; includes some locally-derived alluvium in areas near the Calavaras <br /> — River, chiefly sand with some silt and minor gravel <br />