The Cooperative Soil Survey

SOIL SURVEY OF BARTON COUNTY MISSOURI

Collinsville Series - Missouri Distribution
    The Collinsville series consists of soils on uplands. These soils have a loamy surface layer and are underlain by hard sandstone at a depth of less than 20 inches (fig. 11). Sandstone fragments are on the surface and throughout the soil. These soils are on low divides or mounds near streams in all parts of the county but the southeastern corner. They formed under tall prairie grasses in sandstone residuum. In places the sandstone is interbedded with thin layers of shale.

Figure 11.Profile of Collinsville fine sandy loam, 5 to 14 percent slopes.

    In a representative profile, the surface layer is dark-brown, medium acid fine sandy loam about 10 inches thick. The subsoil is dark yellowish-brown gravelly fine sandy loam about 3 inches thick. Yellowish-brown sandstone is at a depth of 13 inches. It is fractured, and the cracks are filled with brownish fine earth. Below this are thick layers of brownish, hard and soft sandstone that are interbedded with thin layers of shale.
    Collinsville soils are low in natural fertility and are well drained. Permeability is moderately rapid, and the available water capacity is very low. Droughtiness is the major limitation that affects use of these soils. Susceptibility to erosion, stoniness, and rockiness also are limitations.
    Most areas of these soils are in native grasses that are mowed for hay or pastured. A small acreage is in tame grasses, legumes, small grain, and sorghums. In most places cultivated areas of Collinsville soils are closely associated with and include Barco soils.
    Representative profile of Collinsville fine sandy loam, 5 to 14 percent slopes, in an area of native grasses and sumac, 290 feet north and 20 feet east of the southwest corner of sec. 4, T. 33 N., R. 30 W.:

A1—0 to 10 inches, dark-brown (10YR 3/3) fine sandy loam, brown (10YR 5/3) dry; moderate, very fine and fine, granular structure; very friable; common roots; few worm channels and casts; few fragments of sandstone ; medium acid; clear, wavy boundary.

B—10 to 13 inches, dark yellowish-brown (10YR 4/4) gravelly fine sandy loam; weak and moderate, fine and medium, granular structure; very friable; few roots; few iron and manganese concretions; about 30 percent hard and soft fragments of sandstone; strongly acid; abrupt, wavy boundary.

R1—13 to 25 inches, yellowish-brown, hard sandstone that is fractured at 1- to 3-foot intervals; brownish fine earth and fragments of sandstone (10 percent of the mass) fill the cracks.

R2—25 to 50 inches, brownish, hard and soft sandstone interbedded with thin layers of shale.

    The A horizon ranges from very dark brown (10YR 2/2) to dark brown (7.5YR 3/2) and is fine sandy loam or loam. Thickness ranges from 4 to about 20 inches, and the reaction is strongly acid to slightly acid. The B horizon is absent in many places where the depth to hard sandstone is less than about 10 inches. Where present, the B horizon ranges from brown (10YR 4/3) to strong brown (7.5YR 5/6). A C horizon is present in some places. It is similar to the B horizon but lacks structure.
    Collinsville soils are associated with Hector, Bolivar, Barco, Liberal, Barden, and Bronaugh soils. They have a darker colored or thicker surface layer than Hector and Bolivar soils. They are shallower and contain less clay than Bolivar, Barco, Liberal, Barden, and Bronaugh soils.

Hughes, H.E. 1974. Soil Survey of Barton County, Missouri. USDA-SCS. U.S. Gov. Print. Office, Washington, DC.