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RANGE IN CHARACTERISTICS: (from the mineral soil surface) Soil moisture: dry throughout the moisture control section for 60 to 150 days in most years and are dry throughout the entire soil for periods of 10 to 30 days each year during the period soil temperature at 20 inches is above 41 degrees F. Ustic moisture regime. Mean annual soil temperature ranges from 40 degrees to 46 degrees F. Mean summer soil temperature ranges from 48 degrees F. to 58 degrees F. with an O horizon. Thickness of the solum: 18 to 40 inches. Depth to lithic contact: 20 to 40 inches. Weak skeletons occur on surfaces of peds in parts of the Bt horizon in some pedons. Content of organic carbon in the A horizon: 1 to 3 percent and decreases uniformly with depth. Base saturation: 60 to 100 percent . Coarse fragment content: 0 to 35 percent, mainly angular granite pebbles and cobbles. The sand fraction contains lazge amounts of medium and coazse angular granite sand. Packing patterns of sand grains within the matrix tend to be cubical with a significant proportion of flat bearing surfaces between sand grains. Horizons of low organic matter content have a greater than normal differential inconsistence between moist and dry conditions and the soils are said to be "hard setting" when dry. The E horizon: Hue: 2.5Y through 7.SYR Value: 6 or 7 dry, 4 through 6 moist, Chroma: 2 through 4 Reaction: slightly acid to slightly alkaline This horizon is usually platy but is granular or subangular blocky in some pedons. It is soft to slightly hard. The Bt horizon: Hue: 2.SY through 7.SYR Value: 5 or 6 dry, 4 or 5 moist Chroma: 2 through 6 Texture:, sandy clay loam Clay content: 18 to 35 percent Silt content: 5 to 30 percent Sand content: 45 to 70 percent with more than 35 percent fine sand or coazser and with a relatively high percentage of medium and coarse angular granitic sand. When air dry, this horizon is extremely hard and semi-cemented. It has driented clay films in some portions. Reaction: slightly acid to slightly alkaline. Some pedons have sandy clay loam C horizons below depths of 19 inches. COMPETING SERIES: These are the Alderon (WY), Baverton (WY), Belltower (MT), Elbeth (CO), Elbuck (NM), Elmark (MT), Hauean (MT), Hovt (MT), Jemco (CO), Kunz (UT), Losindios (IVM), Lump~u~h (MT), Northrim (CO), PlPlome (CO), Rule (CO), Shoemaker (NM), Sweetweed (MT), and Tunitcha (NM) series. Alderon, Belltower, Elmark, and Rule soils: 20 to 40 inches to paralithic contact. Bayerton soils: have secondary carbonates at depths of 15 to 36 inches Elbeth, Elbuck, Haugan, Hoyt, Kunz, Losindios, Northrim, Plome, Sweetweed and Tunitcha, soils: lack a lithic contact at depths of less than 40 inches. Jemco soils: are dry in Mav and June. Lumpgulch soils: lack B/E horizons. http://ortho.ftw.nres.usda.gov/osd/daUA/ALLENS_PARK.html 09/10/2003