LOCATION HOMEHOLLOW ORTentative Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Vitritorrandic Durixerolls
TYPICAL PEDON: Homehollow ashy sandy loam, on a 0 to 8 percent slope, rangeland. (Colors are for moist soils unless otherwise noted.)
A--0 to 3 inches; dark brown (10YR 3/3) ashy sandy loam, brown (10YR 5/3) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine interstitial pores; 10 percent sand-size (0.25 to 1.0 mm) pumice, (10YR 7/3); 10 percent gravel; slightly alkaline (pH 7.6); clear wavy boundary. (2 to 4 inches thick)
AB--3 to 14 inches; dark brown (10YR 3/3) gravelly ashy sandy loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine, few medium, and few coarse roots; common very fine interstitial pores; 20 percent sand-size (0.25 to 1.0 mm) pumice, (10YR 7/3); 10 percent gravel and 5 percent cobbles; slightly alkaline (pH 7.6); clear wavy boundary. ( 8 to 14 inches thick)
2Bt--14 to 21 inches; brown (10YR 4/3) cobbly clay, pale brown (10YR 6/3) dry; moderate very fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine roots; few very fine tubular pores; common distinct discontinuous clay films on faces of peds; 15 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.8); clear wavy boundary. ( 6 to 8 inches thick)
2Btkq--21 to 27 inches; dark yellowish brown (10YR 4/4) gravelly clay loam, very pale brown (10YR 7/3) dry; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; few medium roots; few fine tubular pores; few distinct discontinuous clay films on faces of peds and lining pores; 20 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.8); abrupt wavy boundary. ( 4 to 8 inches thick)
2Bkqm--27 to 36 inches; brown (10YR 4/3) indurated duripan, light yellowish brown (10YR 6/4) dry; slightly effervescent with segregated lime; moderately alkaline (pH 8.3); abrupt smooth boundary. ( 5 to 15 inches thick)
R--36 inches; basalt
TYPE LOCATION: Crook County, Oregon; located 1750 feet east and 2400 feet south of the NW corner of section 22, T. 17S., R. 16E.; about 2 miles southwest of Prineville Reservoir.
RANGE IN CHARACTERISTICS: These soils are usually dry. It is dry in the moisture control section for 90 to 120 cumulative days. The mean annual soil temperature is 50 to 54 degrees F. Depth to a duripan is 20 to 40 inches. The particle-size control section averages 30 to 35 percent clay and 10 to 35 percent rock fragments. The mollic epipedon is 10 to 18 inches thick, contains an estimated 10 to 30 percent glass with acid oxalate extractable aluminum plus one-half the iron of 0.4 to 0.8 percent.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and dry. It contains 5 to 30 percent gravel, 0 to 20 percent cobbles and 0 to 30 percent stones. The sand-size (0.25 to 1.0mm) pumice content ranges from 10 to 25 percent.
The AB horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 3 or 4 moist and dry. It is ashy sandy loam, ashy loam, or sandy clay loam and contains 10 to 25 percent gravel, 5 to 40 percent cobbles, and 0 to 30 percent stones. The sand-size (0.25 to 1.0mm) pumice content ranges from 10 to 25 percent.
The 2Bt horizon has value of 3 or 4 moist, 6 or 7 dry, and chroma of 3 or 4 moist and dry. It is clay or clay loam and contains 15 to 25 percent gravel, 10 to 20 percent cobbles, and 0 to 20 percent stones. .
The 2Btkq horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 3 or 4 moist and dry. It is clay loam or clay and contains 20 to 30 percent gravel, 10 to 20 percent cobbles, and 0 to 10 percent stones.
The 2Bkqm horizon is indurated.
COMPETING SERIES: This is the St. Andrews series. St. Andrews soils have dense glacial till below the duripan.
GEOGRAPHIC SETTING: Homehollow soils are on lava plains at elevations of 3,700 to 4,200 feet. Slopes range from 0 to 20 percent. These soils formed in residuum and colluvium derived from basalt with an ash influence on the surface. The climate is characterized by cold wet winters and hot dry summers. The mean annual precipitation is 9 to 12 inches, the mean annual temperature is 48 to 52 degrees F. The frost-free period is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ayresbutte, Ayres, and Statz soils. Ayresbutte soils are over old alluvium and loamy-skeletal. Ayres soils are over old alluvium, loamy-skeletal and shallow to a duripan. Statz soils are shallow to a duripan.
DRAINAGE AND PERMEABILITY: Well drained, permeability is moderately slow.
USE AND VEGETATION: Homehollow soils are used mainly for livestock grazing and wildlife habitat. The native vegetation is western juniper, Idaho fescue, bluebunch wheatgrass, antelope bitterbrush, and mountain big sagebrush.
DISTRIBUTION AND EXTENT: Central Oregon; MLRA 10. This series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Crook County Area, Oregon; April 2003. Source of name is a nearby creek on the Alkali Flat quadrangle.
REMARKS: Diagnostic horizons and features include:
Mollic epipedon - from the surface to a depth of 14 inches (A and AB horizons)
Argillic horizon - the zone from 14 to 27 inches (2Bt and 2Btkq horizons) estimated weighted average clay content is 33 percent.
Indurated duripan - from 27 to 36 inches (2Bkqm horizon)
Vitritorrandic feature - from the surface to a depth of 14 inches (A and AB horizons)