LOCATION MOOLACK ORTentative Series
TAXONOMIC CLASS: Ashy, amorphic Andic Haplocryods
TYPICAL PEDON: Moolack sandy loam, woodland. (Colors are for moist soil unless otherwise noted.)
01--1 to 1/2 inch; hemlock needles and twigs.
02--1/2 to 0 inches; decomposed organic materials; abrupt smooth boundary.
A2--0 to 1 inches; very dark gray (10YR 3/1) sandy loam, light gray (10YR 7/1) dry; weak fine granular structure; soft, very friable, slightly sticky, nonplastic; many very fine roots; many very fine irregular pores; strongly acid (pH 5.4); abrupt wavy boundary. (1 to 2 inches thick)
Bir--1 to 7 inches; dark brown (7.5YR 3/2) sand, light yellowish brown and brownish yellow (10YR 6/4, 6/6) dry; single grained; loose, nonsticky, nonplastic; many very fine roots; many very fine irregular pores; slightly acid (pH 6.2); clear wavy boundary. (5 to 8 inches thick)
C1--7 to 13 inches; dark grayish brown (10YR 4/2) coarse sand, light brownish gray and brownish yellow (10YR 6/2, 6/6) dry; few medium gray (N 6/ ) mottles; massive; very soft, very friable, nonsticky, nonplastic; many very fine, and few fine and medium roots; many very fine irregular pores; 5 percent pumice fragments 2 mm to 5 mm; slightly acid (pH 6.2); gradual wavy boundary. (5 to 8 inches thick)
C2--13 to 32 inches; yellowish brown (10YR 5/6) coarse sand, light yellowish brown and brownish yellow (10YR 6/4, 6/6) dry; massive; soft, very friable, nonsticky, nonplastic; many very fine, common fine, and few medium roots; many very fine irregular pores; few streaks and lenses of gray (N 6/ ) fine sand; 10 percent pumice fragments 2 mm to 5 mm; slightly acid (pH 6.2); gradual wavy boundary. (10 to 22 inches thick)
C3--32 to 42 inches; strong brown (7.5YR 5/6) gravelly coarse sand, very pale brown (10YR 8/3) dry; massive; slightly hard, friable, nonsticky, nonplastic; few fine and medium roots; many very fine and fine irregular pores; thin lenses of gray (N 6/ ) fine and very fine loamy sand; 30 percent pumice fragments 2 mm to 5 mm, and 5 percent 5 mm to 19 mm; slightly acid (pH 6.2); gradual wavy boundary. (8 to 12 inches thick)
C4--42 to 52 inches; brown (10YR 5/3) gravelly coarse sand, very pale brown (10YR 8/3) dry; massive; slightly hard, friable, nonsticky, nonplastic; few fine and medium roots; many very fine and fine irregular pores; 30 percent pumice fragments 2 mm to 5 mm, 5 percent 5 mm to 19 mm and 5 percent cobbles; slightly acid (pH 6.2).
TYPE LOCATION: Deschutes County, Oregon; NE1/4 NW1/4 section 10, T. 22 S., R. 12 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 38 to 42 degrees F., and the mean summer soil temperature is less than 47 degrees F. with an O horizon. The soils are usually moist and are dry for less than 60 consecutive days in the control section during the summer months. Depth to bedrock is 60 inches or more. Thickness of the ash commonly is 40 to 60 inches.
The A2 horizon has hue of 10YR, value of 3 or 4 moist and 6 or 7 dry, and chroma of 1 or 2 moist and dry. It is sandy loam or loamy sand.
The B horizon has hue of 7.5YR or 10YR, value of 2 or 3 moist and 5 or 6 dry, and chroma of 2 through 4 moist and 4 through 6 dry. It is sand or loamy sand.
The C horizons have hue of 10YR and 7.5YR, value of 4 or 5 moist and 5 or 6 dry with chroma of 2 to 6 moist and dry. It is coarse sand and gravelly coarse sand. The range in pumice fragments is: 5 to 30 percent 2 to 5 mm in diamter, 5 to 10 percent 5 to 19 mm in diameter, and 5 to 10 percent cobble size.
The buried horizons below the ash is cobbly or very cobbly, medium textured colluvium or glacial till.
COMEPTING SERIES: These are the Winopee soils. Winopee soils have buried loamy B horizons at depths of less than 40 inches.
GEOGRAPHIC SETTING: The Moolack soils have nearly level to very steep slopes at elevations of 5,500 to 7,500 feet. The soil formed in ash. Mean annual precipitation is 40 to 80 inches. The mean annual temperature ranges from 36 to 40 degrees F., the mean January temperature is about 20 degrees F., and the mean July temperature is about 55 degrees F. The frost-free period (32 degrees F.) is 0 to 30 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are competing Winopee soils.
DRAINAGE AND PERMEABILITY: Excessively drained; slow to rapid runoff; rapid permeability.
USE AND VEGETATION: Principal use is timber production. Other uses are recreation and wildlife. Vegetation consists of hemlock, lodgepole pine, white pine, and white barked pine.
DISTRIBUTION AND EXTENT: Cascade Mountains of Oregon. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Deschutes County, Oregon, 1972.
REMARKS: The Moolack series would have been placed in the Podzols.
NSTH 17, RECLASSIFICATION ONLY, 3/95