ZAZA SERIES
The Zaza series consists of shallow, well drained soils that formed in material weathered from basalt with loess mixed into the upper layers. Zaza soils are on south-facing canyon and mountain slopes and hills on plateaus and have slopes of 4 to 65 percent. Permeability is moderate. The average annual precipitation is about 26 inches and the average annual temperature is about 45 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, mixed, frigid Lithic Xerochrepts
TYPICAL PEDON: Zaza loam - on an 18 percent slope, south-southwest aspect, 4,840 feet elevation, in forest. When described on June 11, 1976 the profile was moist. (Colors are for dry soil unless otherwise noted.)
Oi
—1 inch to 0; undecomposed and partially decomposed needles, leaves, and twigs; moderately acid (pH 5.6).A1
—0 to 3 inches; brown (7.5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; moderate fine and medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine roots; many fine irregular pores; 10 percent fine gravel; moderately acid (pH 5.8); abrupt smooth boundary. (2 to 5 inches thick)A2
—3 to 7 inches; brown (7.5YR 5/4) very gravelly loam, dark reddish brown (5YR 3/4) moist; moderate very fine and fine subangular blocky and moderate very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and common coarse roots; many fine tubular pores; 35 percent gravel; moderately acid (pH 5.8); clear wavy boundary. (2 to 5 inches thick)Bw
—7 to 12 inches; reddish brown (5YR 5/4) very gravelly loam, dark reddish brown (5YR 3/4) moist; moderate very fine and fine subangular blocky and moderate very fine and fine granular structure; slightly hard, friable, sticky and plastic; many fine and common coarse roots; many fine tubular pores; about 50 percent gravel; moderately acid (pH 5.8); abrupt wavy boundary. (4 to 10 inches thick)R
—12 inches; fractured basalt with soil material in cracks.TYPE LOCATION: Idaho County, Idaho; about 8 miles southwest of Grangeville; about 2,300 feet south and 1,300 feet west of the northeast corner of section 27, T. 29 N., R. 2 E. Latitude - 45 degrees, 49 minutes, 27 seconds North; Longitude - 116 degrees, 11 minutes, 08 seconds West; USGS White Bird Hill Quadrangle.