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RECEIVED
<br />92
<br />~ APR 19 1999 Soil Survey
<br />Division of Minerals & Geology
<br />ACcssa-21 to 30 inches; very pale brown (tOYR 7f3)
<br />heavy loam, brown (10YR 5/3) moist; weak medium
<br />subangular blocky structure that parts to weak fine
<br />granular; slightly hard, very friable, slightly sticky and
<br />slightly plastic; 2 percent calcium sulfate in common
<br />fine spots; calcareous; moderately alkaline; clear
<br />smooth boundary.
<br />C1ca-30 to 42 inches; light brownish gray (10YR 6/2)
<br />clay loam, grayish brown (10YR 5/2) moist; weak
<br />medium subangular blocky structure that parts to
<br />weak fine subangular blocky; hard, friable, sticky and
<br />plastic; many tine pores; calcium carbonate visible in
<br />small spots and streaks; calcareous; moderately
<br />alkaline; clear smooth boundary.
<br />C2-42 to 60 inches; grayish brown (10YR 5/2) sandy
<br />loam, dark grayish brown (tOYR 4/2) moist;
<br />massive; slightly hard, friable, slightly sticky and
<br />nonplastic; calcareous; moderately alkaline.
<br />Depth to the seasonal water table is 2.5 to 3.5 feet.
<br />Calcium sulfate makes up 10 to about 20 percent of the
<br />salic horizon and is about 5 to 10 times more
<br />concentrated in that horizon than in the underlying C
<br />horizon. Soluble salts make up 2 to 6 percent of the
<br />salic horizon. Clay content in the control section ranges
<br />from 18 to 35 percent, and the content of sand coarser
<br />than very tine sand ranges from 30 to 50 percent.
<br />Decross Series
<br />The Decross series consists of deep, well drained
<br />soils on valley side slopes, tans, and terraces. These
<br />soils formed in calcareous alluvium. The slope is 1 to 15
<br />percent. The average annual precipitation is about 18
<br />inches, and the average annual air temperature is about
<br />37 degrees F.
<br />These soils are fine-loamy, mixed Argic Pachic
<br />Cryoborol Is.
<br />Typical pedon of Decross loam, 1 to 15 percent
<br />slopes, about 70 feet north and 190 feet east of the
<br />Forest Service gate in sec. 33, T. 46 N., R. 8 E.
<br />Al-0 to 6 inches; grayish brown (tOYR 5/2) loam, very
<br />dark grayish brown (10YR 3/2) moist; moderate
<br />medium granular structure; hard, friable, slightly
<br />sticky and slightly plastic; neutral; clear smooth
<br />boundary.
<br />621t-6 to 11 inches; brown (7.5YR 5/2) clay loam, dark
<br />brown (7.5YR 3/2) moist; moderate medium
<br />subangular blocky structure that parts to moderate
<br />medium granular; hard, friable, sticky and plastic;
<br />thin patchy clay films on faces of peds; 10 percent
<br />gravel; mildly alkaline; clear smooth boundary.
<br />B22t-11 to 22 inches; brown (7.5YR 5/2) clay loam,
<br />dark brown (7.SYR 3/2) moist; moderate coarse
<br />prismatic structure that parts to moderate medium
<br />subangular blocky; hard, Triable, sticky and plastic;
<br />thin nearly continuous clay films on faces of peds;
<br />i0 percent gravel; mildly alkaline; clear smooth
<br />boundary.
<br />Baca-22 to 30 inches; brown (7.5YR 5/4) clay loam,
<br />dark brown (7.5YR 4/4) moist; weak coarse
<br />prismatic structure that parts to moderate medium
<br />subangular blocky; hard, friable, sticky and plastic;
<br />10 percent gravel; visible seams and mycelia of
<br />secondary carbonates; calcareous; moderately
<br />alkaline; clear smooth boundary.
<br />Cca-30 to 60 inches; light yellowish brown (10YR 6/4)
<br />clay loam, yellowish brown (10YR 5/4) moist;
<br />massive; hard, friable, sticky and plastic; visible
<br />seams and soft masses of secondary carbonates;
<br />calcareous; 15 percent calcium carbonate;
<br />moderately alkaline.
<br />Depth to calcareous material is 15 to 40 inches, and
<br />the calcium carbonate equivalent is 15 to 25 percent.
<br />Thickness of the mollic epipedon ranges from 16 to 36
<br />inches. The B2t horizons are typically heavy loam or clay
<br />loam. Rock fragments, mainly pebbles, make up 0 to 15
<br />percent of the volume.
<br />Derrick Series
<br />The Derrick series consists of deep, well drained soils
<br />that are on fans and terraces on alluvial valley floors.
<br />These soils formed in medium textured gravelly alluvium.
<br />The slope is 0 to 3 percent. The average annual
<br />precipitation is about 7 inches, and the average annual
<br />air temperature is about 41 degrees F.
<br />These soils are loamy-skeletal, mixed, frigid Typic
<br />Haplargids.
<br />Typical pedon of Derrick very gravelly loam, 0 to 3
<br />percent slopes, 2,040 feet south and 30 feet west of the
<br />NE corner of sec. 36, T. 41 N., R. 6 E.
<br />Al-0 to 4 inches; pale brown (10YR 6/3) very gravelly
<br />loam, brown (10YR 4/3) moist; weak fine and
<br />medium granular structure; slightly hard, friable,
<br />nonsticky and nonplastic; 35 percent gravel; mildly
<br />alkaline; clear smooth boundary.
<br />B2t-4 l0 11 inches; yellowish brown (10YR 5/4) very
<br />gravelly sandy clay loam, dark yellowish brown
<br />(10YR 3/4) moist; weak medium subangular blocky
<br />structure that parts to moderate fine granular; hard,
<br />friable, slightly sticky and plastic; thin patchy clay
<br />films on peds and coating gravel; 50 percent gravel,
<br />mostly basalt; mildly alkaline; clear smooth
<br />boundary.
<br />63ca-11 to 13 inches; yellowish brown (10YR 5/4) very
<br />gravelly heavy sandy loam, dark yellowish brown
<br />(10YR 3/4) moist; weak fine subangular blocky
<br />structure that parts to weak fine granular; slightly
<br />hard, friable, slightly sticky and slightly plastic; 45
<br />percent gravel and 15 percent cobblestones; visible
<br />calcium carbonate occurring as concretions, in thin
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