LOCATION HECHTMAN WY+COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Lithic Haplocryepts
TYPICAL PEDON: Hechtman gravelly sandy loam-timber. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 0.5 inch; forest duff consisting primarily of needles. (0.5 to 1 inch thick)
E--0.5 to 6 inches; light brownish gray (10YR 6/2) gravelly sandy loam, dark grayish brown (10YR 4/2) moist; moderate medium and fine subangular structure; slightly hard, very friable, slightly sticky and slightly plastic; 20 percent gravel; strongly acid (pH 5.2); clear smooth boundary. (4 to 8 inches thick)
Bw--6 to 15 inches; very pale brown (10YR 7/3) very gravelly sandy loam, brown (10YR 5/3) moist; moderate medium and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; 60 percent gravel; moderately acid (pH 5.6); gradual smooth boundary. (6 to 12 inches thick)
R--15 inches; rhyolite bedrock fractured in the upper few inches.
TYPE LOCATION: Teton County, Wyoming; in unsectionized area. Site #38, photo 1-172.
RANGE IN CHARACTERISTICS: Depth to bedrock is 6 to 20 inches. The mean annual soil temperature is about 32 to 36 degrees F., and the mean summer soil temperature is 40 to 47 degrees F. Rock fragments in the control section are mainly pebbles and range from 35 to 65 percent and clay content ranges from 8 to 15 percent.
The E horizon has hue of 2.5Y or 10YR, value of 6 or 7 dry, 3 or 4 moist, and chroma of 2. It is slightly acid through strongly acid.
The Bw horizon has hue of 10YR or 7.5YR, value of 6 or 7 dry, 4 or 5 moist, and chroma of 3 through 6. It is slightly or moderately acid. This horizon rests on the underlying bedrock or on a thin layer of rock fragments over the bedrock.
COMPETING SERIES: These are the Banker, Caseypeak, Cobblank, Cowood, Hotter, Illiano, Jarbidge, Merino, Pendergrass, Sigbird and Treebutte series. The Banker, Jarbidge, and Treebutte soils have a xeric moisture regime. The Caseypeak, Merino, Pendergrass, and Sigbird soils have an ustic moisture regime. The Cobblank soils have a subarctic climate. The Cowood soils have 60 to 80 percent coarse fragments in the Bw horizon. The Hotter soils have mean summer soil temperatures of 50 to 59 degrees F., do not have an O horizon, and formed in slope alluvium or residuum from sandstone and shale. The Illiano soils have 20 to 50 percent volcanic glass in the particle-size control section.
GEOGRAPHIC SETTING: Hechtman soils are on nearly level to steep mountain sides. Slopes are 0 to 60 percent. The soils formed in residuum weathered from rhyolite beds. Elevation is 6,500 to 9,000 feet. Average annual temperature is about 30 to 34 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Taglake soils. Taglake soils lack bedrock above depth of 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; low runoff; rapid permeability.
USE AND VEGETATION: These soils are used for recreation and wildlife habitat. Vegetation is white bark pine and alpine fir.
DISTRIBUTION AND EXTENT: In the mountains of western Wyoming. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Teton County, Wyoming, Grand Teton National Park Area; 1975.
REMARKS:
The 3/2008 description reflects a change in classification from Loamy-skeletal, mixed, superactive Lithic Eutrocryepts to Loamy-skeletal, mixed, superactive Lithic Haplocryepts due to revision of the cryepts great groups and subgroups. The competing series section was not updated and should be reviewed after all the cryepts have been re-classified.