LOCATION GINNIS WAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Ultic Haploxerolls
TYPICAL PEDON: Ginnis loam - on a 16 percent northwest-facing back slope under grass and shrubs at an elevation of 2,440 feet. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures)
A--0 to 10 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; many very fine, and common fine roots; many very fine continuous interstitial pores; 5 percent fine gravel; neutral (pH 6.6); clear wavy boundary. (8 to 14 inches thick)
Bw1--10 to 22 inches; brown (10YR 5/3) gravelly loam, brown (10YR 4/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine interstitial and few very fine tubular pores; 15 percent gravel; neutral (pH 6.8); clear wavy boundary. (8 to 14 inches thick)
Bw2--22 to 31 inches; pale brown (10YR 6/3) gravelly sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure parting to weak, fine subangular blocky; slightly hard, friable, slightly sticky and nonplastic; few very fine and fine roots; common fine interstitial pores; 20 percent gravel; neutral (pH 6.8); abrupt wavy boundary. (4 to 13 inches thick)
Cr--31 inches; white, pale brown, and very pale brown (10YR 8/2, 10YR 7/4) partially decomposed quartz monzonite; massive, breaks to gravelly coarse sand.
TYPE LOCATION: Okanogan County, (Colville Indian Reservation) Washington; about 4 miles northeast of the town of Coulee Dam; 2,000 feet south and 600 feet east of the northwest corner of sec. 26, T. 29 N., R. 31 E., W.M.
RANGE IN CHARACTERISTICS: The solum thickness and depth to a paralithic contact range from 20 to 40 inches. The mollic epipedon is 8 to 14 inches thick. The mean annual soil temperature is 49 to 51 degrees F. These soils are usually moist but are dry in all parts between depths of 8 and 24 inches or to weathered bedrock for 90 to 105 consecutive days following the summer solstice. Rock fragments in the particle-size control section average from 10 to 35 percent by weighted average, but individual subhorizons contain up to 45 percent. Reaction is slightly acid or neutral.
The A horizon has a value of 4 oe 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry or moist. It has weak to moderate fine and medium subangular blocky and granular structure. Some pedons have a cobbly or stony surface horizon with 15 to 20 percent cobbles or 0.1 to 3 percent stones.
The Bw horizon has a value of 5 to 7 dry, 3 to 5 moist, and chroma of 2 or 3 dry or moist. It is gravelly loam, gravelly sandy loam, gravelly coarse sandy loam, cobbly sandy loam, loam, or sandy loam. Pebbles range from 10 to 30 percent cobbles from 0 to 25 percent.
Some pedons have a C horizon up to 16 inches thick. It has a value of or 7 dry and 4 or 5 moist. It is sandy loam or coarse sandy loam and is 5 to 30 percent pebbles.
COMPETING SERIES: These are the Ardening, Billyridge, Burrant, Canderly, Catelli, Crouch, Hellgate, Picard, Rebecca, Shangland, and Wind River series. Canderly soils have a mean annual soil temperature of 54 to 56 degrees F. Catelli soils have 0 to 15 percent rock fragments in the control section and a mean annual soil temperature of 56 to 58 degrees F. Ardening, Billyridge, Burrant, Crouch, Hellgate, Picard, Rebecca, and Wind River soils are deep or very deep. Shangland soils are dry for 60 to 80 consecutive days and have a mollic epipedon from 12 to 20 inches thick.
GEOGRAPHIC SETTING: Ginnis soils are on footslopes, backslopes, and shoulders of hills and uplands at elevations of 1,000 to 3,200 feet. Slopes are 3 to 70 percent. These soils formed in residuum and colluvium derived from granodiorite and quartz monzonite. They occur in a climate with warm, dry summers and cool, moist winters. The average annual precipitation is 12 to 15 inches. The average January temperature is about 24 degrees F, average July temperature is about 70 degrees, and the average annual air temperature is about 48 degrees F. The frost-free season is about 110 to 165 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Broadax, Dinkelman, Dinkels, Morical, Skanid, and Tyee soils, and the competing Spokane soils. Broadax and Morical soils have an argillic horizon. Dinkelman soils are frigid. Dinkels soils are deep. Skanid and Tyee soils are shallow.
DRAINAGE AND PERMEABILITY: Well drained; slow to very rapid runoff; moderate permeability.
USE AND VEGETATION: Rangeland, wildlife habitat, and watershed are the principal uses. Native vegetation is mainly bluebunch wheatgrass, Sandberg bluegrass, Idaho fescue, antelope bitterbrush, arrowleaf balsamroot, and widely scattered ponderosa pine.
DISTRIBUTION AND EXTENT: Northcentral Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Okanogan County, Colville Indian Reservation, Washington, 1982.
REMARKS: Diagnostic horizons and features recognized in this soil are mollic epipedon from the surface to 10 inches, a cambic horizon from 10 to 31 inches, and a paralithic contact with weathered quartz monzonite at 31 inches.