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Series Descriplioo <br />Rock fragments: Average 35 to 75 percent in the particle-size control section cobbles and/or stones may comprise <br />up to 40 percent of the total. Surface layer contains from 10 to 55 percent coazse fragment. <br />A and Bw horizons <br />Hue: SYR, 7.SYR, lOYR <br />Value: 4 to 6 dry, 3 or 4 moist <br />Chroma: 2 to 6 <br />Fine-earth fraction: fine sandy loam, sandy loam, very fine sandy loam or loam <br />Bk horizon <br />Hue: SYR, 7.SYR, lOYR <br />Value: 5 to 8 dry, 4 to 7 moist <br />Chroma: 1 to 4 <br />Calcium cazbonate equivalent: 15 to 40 percent In some pedons this horizon is weakly cemented. <br />Texture of fine-earth fraction: sandy loam to loam. <br />COMPETING SERIES: These are the Buffcreek(WY), Chicosa (T CO), Clapper(UT), Claprvch (Wy), <br />Placitas(NM), Seis(NM), and Strvch(UT) soils. Buffcreek and Clapper soils have more than 18 percent clay in the <br />particle-size control section. Chicosa soils have a lithologic discontinuity. Claprych soils have hue of lOYR <br />throughout the solum. Placitas, and Seis soils are 20 to 40 inches deep to lithic or pazalithic contacts. Strych soils <br />aze dry for longer periods of time (April through June). <br />GEOGRAPHIC SETTING: These soils formed mostly on mesas, fan terraces and hills. The soils formed from <br />alluvium, colluvium and eolian materials derived from quartzite, granite, basalt, gneiss, schist and limestone. Slope <br />ranges from 0 to 75 percent. The average mean annual temperature is 48 to 54 degrees F. The mean annual <br />precipitation is 10 to 12 inches. Frost-free period is 120 to 140 days. Some azea outside of New Mexico have been <br />correlated with elevations as low as 4500 feet, precipitation as high as 15 inches, temperatures as low as 42 <br />degrees, and frost free period as long as 180 days. Elevation ranges from 5,000 to 6,800 feet. <br />GEOGRAPHICALLY ASSOCIATED SOILS: These aze the Harvev, Scholle, Tesaio• Willazd, and Witt <br />soils. Harvey and Scholle soils have 18 to 35 percent clay in the control section and Scholle soils have an azgillic <br />horizon. Tesajo soils have a thick mollic epipedon. Willard soils have more than 40 percent carbonates in the <br />control section. Witt soils have less than 15 percent fine sand or coarser. <br />DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is negligible on <br />slopes less than 1 percent, very low on 1 to 5 percent slopes, low on 5 to 20 percent slopes, and medium on slopes <br />greater than 20 percent. <br />USE AND VEGETATION: These soils are used as rangeland. The vegetation is dominantly blue grams and <br />muhly together with black grams, hairy grams, sideoats grams, juniper, and sacahuista. <br />DISTRIBUTION AND EXTENT: Northcentral New Mexico and western Colorado. The series is moderately <br />extensive. <br />MLRA OFFICE RESPONSIBLE: Temple, Texas <br />SERIES ESTABLISHED: Lower Colorado Area, Colorado, 1970. <br />REMARKS: The distinction between Ildefonso and Strych is not well defined. <br />http://ortho.ttw.nros.usda.gov/tgi-bin/asd/osdnemo.cgi?-P Page 2 of 3 <br />