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Cascajo Series <br /> The Cascajo series consists of very gravelly soils on nn i <br /> escarpiinent above the Arkan as Riven•. The gravel was de- <br /> posited by the Arkansas Rirer.The escarpment is between <br /> the present river bottom and old river terraces,which are <br /> now part of the ui)lallds.At the foot of the escarpment are <br /> many outcrops of soft, light yellowish-brown, very linty <br /> shale. <br /> The surface 1,Lyer of these soilsis gray ish-brown gravelly E <br /> loam about 5 inches thick.This layer generally is free of <br /> lime. <br /> Below the surface layer is pale-brown, limy, gravelly <br /> loamy sand.The lower surface of the gravel is coated with <br /> lime. <br /> Casmio soils are escessi% ' drained and are low in <br /> natural fertility. If overgrazed, they are highly suscepti- <br /> ble to-rater erosion. <br /> These soils are used for range. The native range plants <br /> are blue granna, side-oats grama, sand dropseed, needle- <br /> and-thread, cliollar cactus, rabbitbrush, yucca, and four- <br /> Tvino, saltbusli. The escarpment is a• good source of com- <br /> inercial gravel. <br /> Representative profile in a.gravel pit on the north side <br /> of the Arkansas Ricer, along the highway north of <br /> Mannzanola. <br /> 31-0 to 5 inches, grayish-brown (10YR 5/2) grarelly loam, <br /> dart; grayish brown (10YR 4/2) when moist; mod- <br /> erate, inedium, crumb structure; soft when dry, very <br /> friable when moist; noncalcareous; clear, smooth <br /> boundary. <br /> Cca-5 to 60 inches, pale-brown (10YR 0/3) gravelly loamy <br /> sand, brown (10YR 5/3) rrhea moist; single grain; <br /> loose rhea dry or moist; calcareous; loner surface <br /> of gravel coated with llme carbonate,-Particularly in f <br /> the uppermost part of this horizon. { <br /> The surface layer is 4 to 0 inches thick. <br /> Cascaio soils are associated with Otero soils, but they are <br /> steeper and more grarelly than those soils.They are steeper and <br /> coarser textured than Harrey soils. <br /> Cascajo soils and Gravelly Iand (5 to 25 percent - <br /> slopes) (Co).—The surface layer of the Cascajo soils - <br /> ranges from gravelly loans to very gravelly sandy loam. <br /> The slope ranges from 5 to 25 percent, but most, of the <br /> acreage has a slope of more than 10 percent. Some areas <br /> of this comple-x are deeply cut by V-shaped drainageNvays, <br /> a few of which contain flowing springs. Include in the <br /> areas mapped are in onerous commercial gravel pits. <br /> This complet,is used for range. 'Most of the range is <br /> overgrazed. The native plants are cholla, cactus, prickly- <br /> pear, and sand dropseed. (Nonirrigated capAbility unit <br /> VTIs-1; Gravel Breaks range site) <br />