LOCATION LOGGERT MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Mollic Palecryalfs
TYPICAL PEDON: Loggert extremely stony loam, rangeland. (Colors are for dry soils unless otherwise noted.)
A--0 to 7 inches; very dark grayish brown (10YR 3/2) extremely stony loam, very dark brown (10YR 2/2) moist; weak coarse crumb structure; slightly hard, very friable, slightly sticky and slightly plastic; 60 percent stones and cobbles; slightly acid (pH 6.4); clear wavy boundary. (5 to 8 inches thick)
E--7 to 19 inches; pinkish gray (7.5YR 7/2) extremely stony loam, brown (7.5YR 4/2) moist; strong very fine crumb structure; slightly hard, very friable, slightly sticky and slightly plastic; 70 percent stones and cobbles; moderately acid (pH 5.8); diffuse boundary. (0 to 12 inches thick)
B/E--19 to 40 inches; (Bt) brown (7.5YR 5/4) extremely stony sandy clay loam, brown (7.5YR 4/4) moist; and (A2) pinkish gray (7.5YR 7/2) sandy loam, brown (7.5YR 5/4) moist; moderate fine subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; 75 percent stones and cobbles; slightly acid (pH 6.2); gradual boundary. (18 to 30 inches thick)
Bt--40 to 60 inches; reddish brown (5YR 5/4) extremely stony sandy clay loam, reddish brown (5YR 4/4) moist; some peds coated with pinkish gray (7.5YR 7/2), brown (7.5YR 5/4) moist; moderate fine subangular blocky structure; very hard, firm, moderately sticky and very plastic; 80 percent stones and cobbles; moderately acid (pH 6.0).
TYPE LOCATION: Cascade County, Montana; 1,280 feet south and 50 feet east of the NW corner of section 16, T.17N., R.6E.
RANGE IN CHARACTERISTICS: Volume of coarse fragments, mainly stone and cobble size, ranges from 50 to 80 percent throughout the soil. The less than 2 mm. fraction in the A and E horizons is loam or sandy loam.
The A horizon has hue of 10YR or 7.5YR, value of 3 or 4 dry, 2 or 3 moist, and chroma of 2 or 3. Both A&B and B/E horizons occur in some pedons.
COMPETING SERIES: This is the Fitzgerald series. Fitzgerald soils have an average summer temperature of 55 to 58 degrees F. and are in a 25 to 40 inch precipitation zone.
GEOGRAPHIC SETTING: Loggert soils are sloping to very steep and are on uplands at elevations of 4,500 to 6,000 feet. The soils formed in material weathered from sandstone. Average annual precipitation is 18 to 25 inches. Mean annual temperature is 34 degrees to 42 degrees F., mean January temperature is 8 degrees to 25 degrees F., and mean July temperature is 50 degrees to 55 degrees F. The (32 degrees F.) growing season is 60 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cheadle, Libeg and Monad soils and the competing Tigeron soils. Cheadle soils have bedrock at depths of less than 20 inches. Libeg soils have Bt horizons at shallower depths and lack B/E horizons. Monad soils have fine-loamy control sections.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: Loggert soils are used as rangeland. Native vegetation is bluebunch wheatgrass, Idaho fescue, and rough fescue, a low density stand of ponderosa pine trees and forbs and shrubs.
DISTRIBUTION AND EXTENT: Central and northern Montana. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Cascade County, Montana, 1975.
REMARKS: Diagnostic horizons and features recognized in this pedon are an albic horizon from 7 to 19 inches (E horizon); a glossic horizon from 19 to 40 inches (B/E horizon); and an argillic horizon from 40 to 60 inches (Bt horizon).