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Official Series Description - CASCAJO Series Exhibit I (2) Established Series RJL/GB 07/97 CASCA.T® SERIES Page 1 of 2 The Cascajo series consists of deep, excessively drained soils that formed in very gravelly and sandy alluvium over shale or sandstone at depths of 4 to 20 feet. Cascajo soils are on terraces, terrace edges and ridges and have slopes of 2 to 40 percent. The mean annual precipitation is about 12 inches and the mean annual temperature is about 52 degrees F. TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Ustic Haplocalcids TYPICAL PEDON: Cascajo very gravelly sandy loam, grassland. (Colors are for dry soil unless otherwise noted.) A--O to 6 inches; light brown (7.SYR 6/4) very gravelly sandy loam, dazk brown (7SYR 4/4) moist; moderate medium granulaz structure; slightly hard, very friable; common very fine roots; 40 percent pebbles, I S percent cobbles; weakly calcareous; moderately alkaline; clear wavy boundary. (2 to b inches thick) AC--6 to 10 inches; light brown (7.SYR 6/4) very gravelly sandy loam, dark brown (7.SYR 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable; common very fine roots; 40 percent pebbles, 10 percent cobble; slightly calcareous; moderately alkaline; clear irregular boundary. (0 to 8 inches thick} Ck--10 to 21 inches; very pale brown (1 OYR 8/3) very gravelly sandy loam, pale brown (lOYR 6/3) moist; weak medium subangular blocky structure; slightly hazd, loose; few very :Fine roots; 40 percent pebbles, 5 percent cobbles; strongly calcareous and thick lime coatings on pebbles and cobbles; moderately alkaline; clear wavy boundary. (10 to 24 inches thick) C--21 to 48 inches; very pale brown (1 OYR 7!3) stratified very gravelly loamy coarse sand and very gravelly sand, brown (lOYR 5/3) moist; single grain; loose; 40 percent pebbles, IS percent cobbles; strongly calcareous; moderately alkaline. ~ TYPE LOCATION: Pueblo County, Colorado; northwest 114 of southeast 1/4 of Sec. 15, T. 21 S., R. 64 W. RANGE IN CHARACTERISTICS: Mean annual soil temperature is about 52 degrees F., mean summer soil temperature is about 69 degrees F. Colors throughout the profile range from 7.SYR through 2.SY in hue, 2 through 4 in chroma, and 4 through 8 in value. Texture of the A, AC, and Ck horizons are modified with pebbles and cobbles and range from gravelly sandy loam through very gravelly or extremely cobbly sand or sandy loam. C horizon may range to extremely cobbly loamy sand or sand. A horizon is mildly to moderately alkaline. olume of coarse fragments in the C ranges from 35 to 80 percent with 5 to 30 percent larger than 3 inches. SERIES: The closely related Pala soils lack a calcic horizon. 2APHIC SETTING: Cascajo soils are on terrace edges, hills, knolls and ridges. Slopes range from 2 to 40 The soils formed in very gravelly and sandy alluvium that ranges from about 4 to 20 feet thick over shale or ~e. Mean annual precipitation is about 12 inches and average annual temperature is about 52 degrees F.