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2Bgm2-29 to 48 inches; ated brown (7.5YR 5/4) <br /> and strong brown (7. )duripan,dark brown <br /> 7.5YR 3/4) moist; ex. ely hard and brittle;silica <br /> 0, 227 and sesquioxide cementation in more than 90 <br /> San Joaquin Series ,, 23 . percent of the matrix;common very fine closed <br /> tubular pores;common fine iron and manganese <br /> The San Joaquin series consists of moderately well concretions and stains; strongly effervescent; <br /> drained soils on low terraces and dissected terraces. segregated lime in fractures; moderately alkaline; <br /> These soils are moderately deep to a hardpan (fig. 12). clear wavy boundary. <br /> They formed in alluvium derived from dominantly - <br /> granitic rock sources. Slope ranges from 0 to 8 percent. 28q-48 to 60 inches; brown (7.5YR 5/4)duripan,dark <br /> Soils of the San Joaquin series are fine, mixed, brown (7.5YR 3/4) moist;extremely hard and brittle; <br /> thermic Abruptic Durixeralfs. silica and sesquioxide cementation in 70 to 90 <br /> Typical pedon of San Joaquin loam, 0 to 2 percent percent of the matrix;many very fine interstitial <br /> slopes; 1,700 feet north and 2,600 feet east of the pores;common fine iron and manganese <br /> southwest corner of sec. 3, T. 4 N., R. 6 E., Lodi North concretions; moderately alkaline. <br /> quadrangle: Depth to the duripan is 20 to 40 inches. <br /> Ap-0 to 6 inches;brown (7.5YR 5/4) loam,dark brown The A horizon has color of 7.5YR 5/2,5/4, 6/2, or 6/4 <br /> (7.5YR 3/4) moist;moderate medium and fine or 10YR 4/3, 5/3, 6/3, or 6/4. When moist, it has color <br /> subangular blocky structure; hard, friable,slightly of 7.5YR 3/4, 4/2,4/4,or 5/2 or 10YR 3/3, 4/3, 5/3, or <br /> sticky and slightly plastic;common very fine roots; 5/4. It is sandy loam or loam. Reaction generally is <br /> manv very fine tubular and interstitial and few fine moderately acid or slightly acid but may be neutral in <br /> tubwnr -,cress rr=:•: ::irx omv/ ; t i iron areas that have been limed. <br /> anr, m;ttt , ,nr Sr, e1 .lnrt :i trr eutral; The Bt horizon has color of SYR 5/6 or 7.5YR 5/4, <br /> clear .vnvv :tounnctr 5/6,or 6/6. When moist, it has color of SYR 4/4 or <br /> Btl-.i to 10 ncnes: :r .:: 'r'9 ; a; cam. reddish 7.5YR 4/4. It is sandy clay loam or loam. Reaction is <br /> brown 5'(R 1.1i ;;uernte rnNdhrtn moderately acid to neutral. <br /> subannuiar nloc*t'v :ours horn. ;rinclw, ;lightly The 2Bt horizon has color of 2.5YR 3/4,4/4,4/6,4/8, <br /> sticky inft :ai9tit1y Inrimion veru rine roots; or 5/4;SYR 3/3,3/4,4/3, 4/4, 4/6, 5/4,5/6,or 5/8;or <br /> M"1111/ . 'r.n• ri;r :: . amninn :r•ry ❑ne 7.5YR 4/6, 5/2,5/4,5/6, 6/4,or 6/6.When moist,it has <br /> color of 7.SYR 4/2,4/4, 4/6,5/4, or 5/6;SYR 3/3,4/4, or <br /> interstitial pores;few thin clay films r faces of 4/6;or 2.SYR 3/4,4/4,3/6, or 4/6. It Is clay loam or <br /> peds and bridging mineral grains;very dark gray clay. Reaction is slightly acid to mildly alkaline. <br /> (tans 3/1) iron and manganese concretions and The duripan has color of SYR 3/3, 4/3,5/6, or 5/8; <br /> stains:moderately acid;clear wavy boundary. 7.5YR 4/6,5/2, 5/4,6/4, or 7/2;or 10YR 5/4, 5/6, or 7/3. <br /> 3tp-10 to 16 inches;brown (7.5YR 5/4) loam, reddish <br /> brown (SYR 4/4) moist;moderate medium It Is indurated or strongly cemented with iron,silica,or <br /> both. <br /> subangular blocky structure;very hard,friable, -- - <br /> sticky and plastic;many very fine and few fine t-t <br /> tubular and common very fine interstitial pores;few , <br /> thin clay films on faces of peds and common thin r�-- <br /> clay films bridging mineral grains;common light r .X#• <br /> gray(10YR 7/2)fine sand or silt grains on faces of �, �►-" .�„ <br /> peds and lining pores,few fine very dark gray `+,.• tip,;,.. `�a;� ' <br /> (1 OYR 3/1)iron and manganese concretions; <br /> moderately acid;abrupt wavy boundary. <br /> 2Bt3-16 to 21 inches;brown (7.5YR 5/4)clay, strong <br /> brown (7.5YR 4/6) moist;moderate medium e-.!_ ' _ - •• ,._ <br /> YK. <br /> prismatic structure;extremely hard,firm,sticky and �. ,�" - ;-`;t:`f+:._` ' - - ' s•-`b`,t� <br /> very plastic.few very fine,fine,and medium roots; r <br /> common very fine tubular and few very fine <br /> -•> '•"..;a Jl <br /> interstitial pores;common moderately thick clay <br /> films on faces of peds and many thin clay films a�sr• .- _ ���. � <br /> bridging mineral grains;common slickensides thatr. <br /> do not intersect;about 3 percent fine very dark gray <br /> (10YR 3/1)iron and manganese concretions; <br /> neutral;gradual wavy boundary. _ <br /> 2Bt4-21 to 26 inches;brown (7.5YR 5/4)clay, brown <br /> (7.5YR 4/4) moist; moderate medium prismatic <br /> structure;extremely hard,firm,sticky and plastic; <br /> few very fine,fine, and medium roots;common very <br /> fine tubular and few very fine interstitial pores-, <br /> common moderately thick clay films on faces of t <br /> peds and common thin clay films bridging mineral <br /> grains; about 3 percent very dark gray(10YR 3/1) <br /> iron and manganese concretions and stains; r <br /> neutral;abrupt wavy boundary. �T• *`� ` <br /> 28gm1-26 to 29 inches;variegated brown (7.5YR 5/4) j <br /> and light brown (7.5YR 6/4) duripan,brown(7.5YR <br /> 4/4) moist,extremely hard and brittle,silica and <br /> sesquioxide cementation in more than 90 percent of <br /> the matrix; few fine iron and manganese ° <br /> concretions;common very fine closed tubular pores; <br /> strongly effervescent;segregated lime infractures; <br /> moderateiv alkaline;gradual smooth boundary. <br /> Figure 12.-Profile of a San Joaquin roam.A ciavpan is at a depth <br /> of 16 inches,and a Burman Is at a depth of 25 inches.Both <br /> layers restrict root nen,-i,anon and water movement.Depth is <br /> marked in feet. <br />