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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.
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