LOCATION DEADFALL CAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, magnesic Typic Cryorthents
TYPICAL PEDON: Deadfall series on a southwest facing slope of 45 percent under a sparse cover of huckleberry oak, rabbitbrush, bunchgrasses and occasional conifers (70 percent gravel pavement) at 7,600 feet elevation. (Colors are dry soil unless otherwise stated. When described (8/5/80) the soil was slightly moist throughout.)
01--1/2 inch to 0; very sparse, scattered, and undecomposed litter. (0 to 1 inches thick)
A--0 to 6 inches; pale brown (10YR 6/3) very gravelly sandy loam, dark brown (10YR 3/3) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and nonplastic; many very fine and few fine roots; many very fine interstitial pores; 35 percent pebbles, 10 percent cobbles; slightly acid (pH 6 5); clear smooth boundary. (6 to 15 inches thick)
C1--6 to 14 inches; yellowish brown (10YR 5/4) very gravelly sandy loam, brown (10YR 4/3) moist; weak very fine granular structure; soft, very friable, slightly sticky and nonplastic; common very fine interstitial pores; 45 percent pebbles; 3 percent cobbles; neutral (pH 7.0); gradual wavy boundary. (4 to 8 inches thick)
C2--14 to 24 inches; yellowish brown (10YR 5/4) extremely gravelly sandy loam, brown (10YR 4/3) moist; weak very fine granular structure; soft, very friable, slightly sticky and nonplastic; few very fine roots; many very fine interstitial pores; 50 percent pebbles, 25 percent cobbles and stones; mildly alkaline (pH 7.5); abrupt wavy boundary (10 to 14 inches thick)
R--24 to 34 inches; highly fractured serpentinized pendotite.
TYPE LOCATION: Siskiyou County, California; about 7 miles west of the city of Mt. Shasta, 1 1/2 miles east of Mt. Eddy summit, in the NW 1/4 NW 1/4 section 17, T. 40 N., R. 5 W. Hand dug pit along jeep trail.
RANGE IN CHARACTERISTICS: The depth to bedrock ranges from 20 to 30 inches. The mean annual soil temperature ranges from 38 to 45 degrees F, and the mean summer soil temperature varies from 50 to 57 degrees F. There is no effective 0 horizon.
The A horizon has dry color of 10YR 6/3, 6/4, 5/2, 5/3, 5/4, 2.5YR 4/4, 6/4 or 7/4 and moist color of 10YR 3/2, 3/3, 4/3, 4/4 or 2.5YR 3/4. It is sandy loam or loamy sand with 5 to 15 percent clay modified by 35 to 45 percent pebbles and 5 to 10 percent cobbles by volume. It is slightly acid to mildly alkaline. The dark colors of a mollic epipedon are only in the upper 3 to 5 inches of some pedons.
The C horizon has dry color of 10YR 5/4, 2.5YR 6/3, 6/2 or 7/4 ant moist color of 10YR 3/4, 4/3, 4/4, 2.5YR 4/2 or 4/5. It is sandy loam or loam with 10 to 20 percent clay modified by 60 to 85 percent rock fragments. It is neutral to mildly alkaline.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Deadfall soils are on slightly dissected smooth upper slopes and ridges. Elevation are 6,500 to 8,900 feet. Slopes are 35 to 65 percent. Deadfall soil are formed in material weathered from ultramafic rocks. Rock fragments cover 50 to 100 percent of the area and rock outcrop ranges from 0 to 10 percent. The average annual precipitation ranges from 40 to 60 inches. The climate is Hudsonian with cold snowy winters and warm dry summers. The mean annual temperature ranges from 35 to 42 degrees F. The mean January temperature is 21 degrees F. And the mean July temperature is 55 degrees F. The frost-free season is 30 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: See Remarks.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Watershed and wildlife. The natural vegetation is perennial bunchgrass, granite phlox, sulfur buckwheat, huckleberry oak, rabbitbrush, a few scattered Jeffery pine, western white pine and white fir. Vegetation is sparse, a gravel pavement covers 50 to 100 percent of the ground surface.
DISTRIBUTION AND EXTENT: Klamath Mountains of northern California and possibly southern Oregon. The soils of this series are not extensive. Their total acreage is about 6,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Klamath National Forest, California, 1982.
REMARKS: This series was established to map a new family in a survey area where soil map unit components were mapped only to the family level.
OSED scanned by SSQA. Last revised by state on 8/82.