LOCATION JUG WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Andic Haplohumods
TYPICAL PEDON: Jug very gravelly loam - on a 2 percent convex slope under a conifer canopy. (Colors are for moist soil unless otherwise stated. All textures are apparent field textures)
Oi--4 to 1 inch, undecomposed forest letter. (2 to 5 inches thick)
Oa--1 inch to 0; decomposed forest litter; common fine and very fine roots. (1 to 3 inches thick)
E--0 to 2 inches; brown (7.5YR 4/2) gravelly loam, pinkish gray (7.5YR 7/2) dry; massive; soft, very friable, nonsticky and nonplastic; common very fine roots; very few very fine irregular pores; 30 percent rounded pebbles; very strongly acid (pH 5.0); abrupt wavy boundary. (1 to 4 inches thick)
Bhs--2 to 7 inches; strong brown (7.5YR 4/6) very gravelly loam; reddish yellow (7.5YR 6/6) dry; many coarse dark reddish brown (5YR 3/2) organic stains on faces of peds; weak coarse subangular blocky structure; slightly hard, friable, nonsticky and nonplastic, weakly smeary; few fine roots; few very fine irregular pores; 40 percent rounded pebbles, 15 percent cobbles; very strongly acid (pH 5.0); abrupt wavy boundary. (4 to 7 inches thick)
Bs--7 to 16 inches; strong brown (7.5YR 4/6) extremely cobbly sandy loam, brownish yellow (10YR 6/6) dry; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic, weakly smeary; few fine roots; few fine irregular pores; 40 percent rounded pebbles, 30 percent cobbles; strongly acid (pH 5.4); clear wavy boundary. (8 to 12 inches thick)
2C1--16 to 40 inches; dark yellowish brown (10YR 4/6) extremely cobbly loamy sand, brownish yellow (10YR 6/6) dry; single grain, loose; very few very fine roots; many fine irregular pores; 40 percent rounded pebbles, 30 percent cobbles; strongly acid (pH 5.4); abrupt irregular boundary. (20 to 30 inches thick)
2C2--40 to 60 inches; dark yellowish brown (10YR 6/6) extremely cobbly sand, brownish yellow (10YR 6/6) dry; single grain; loose; common fine irregular pores; 45 percent rounded pebbles, 30 percent cobbles; strongly acid (pH 5.4)
TYPE LOCATION: Skagit County, Washington; approximately 1,100 feet south and 1,300 feet west of the northeast corner of sec. 13, T. 33 N., R. 6 E.
RANGE IN CHARACTERISTICS: The fine-earth fraction has a bulk density of 0.85 ot 0.95 g per cubic centimeter to a depth of 14 to 20 inches. The mean annual soil temperature ranges from 44 to 46 degrees F. The upper part of the particle-size control section is 40 to 60 percent pebbles and 0 to 25 percent cobbles. The lower part is 40 to 70 percent pebbles and 0 to 30 percent cobbles. The thickness of the solum and depth of influence of volcanic ash is 14 to 30 inches.
The E horizon has hue of 7.5YR or 10YR, value of 4 or 5 moist, 6 through 8 dry, and chroma of 2 or 3 moist and dry. Reaction is very strongly acid or strongly acid.
The Bhs horizon matrix has hue of 7.5YR or 5YR, value of 3 or 4 moist, 5 or 6 dry, and chroma of 4 through 6 moist and dry. Organic stains have hue of 2.5YR or 5YR, value of 2 or 3 moist, 3 or 4 dry, and chroma of 2 or 3 moist and dry. The fine earth fraction is loam or sandy loam. The Bhs horizon is 40 to 60 percent pebbles and cobbles.
The Bs horizon has hue of 7.5YR or 10YR, value o 4 or 5 moist, 6 or 7 dry, and chroma of 4 through 6 moist and dry. It is very cobbly sandy loam, very cobbly loam, extremely cobbly sandy loam, or extremely cobble loam and is 40 to 70 percent pebbles and cobbles.
The 2C horizon has hue of 10YR or 2.5Y, value of 4 through 6 moist, 6 or 7 dry, and chroma of 4 through 6 moist and dry., It is very cobbly sand, very cobbly loamy sand, extremely cobbly sand, or extremely cobbly loamy sand and is 45 to 75 percent pebbles and cobbles.
COMPETING SERIES: These are the Etach, Skykomish, and Solduc series in other families. Etach soils have less than 6 percent organic carbon in the upper 10 cm of the spodic horizon. Skykomish soils lack a spodic horizon. Solduc soils are mesic.
GEOGRAPHIC SETTING: Jug soils are on glacial outwash terraces at elevations of 1,000 to 2, 000 feet. They formed in volcanic ash and glacial outwash deposits. Slopes are 0 to 30 percent. The average annual precipitation is 70 to 80 inches, and the mean annual temperature is 42 to 44 degrees F. Average January temperature is about 32 degrees F. and average July temperature is about 60 degrees F. The frost-free season is about 100 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Elwell, Illabot, Kindy, Oakes, Saxon, and Skykomish soils. Elwell, Illabot, and Kindy soils are 20 to 40 inches deep to a paralithic contact with dense glacial till. Oakes soils are medial-skeletal. Saxon soils are fine-silty. Skykomish soils lack a spodic horizon.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; very slow to moderate runoff; moderately rapid permeability in the solum and very rapid in the 2C horizon.
USE AND VEGETATION: Used for woodland. Native vegetation consists of western hemlock, Douglas-fir, western redcedar and red alder with an understory of red huckleberry, Oregon-grape, salal, princes pine, western swordfern, deer fern, lady fern, vine maple, and western brackenfern.
DISTRIBUTION AND EXTENT: Valleys of the west slopes of the Cascade Mountains in the northwest Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Skagit County, Washington, 1981.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy.