LOCATION JORGENSEN WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, magnesic Typic Humicryods
TYPICAL PEDON: Jorgensen gravelly silt loam, on a 10 percent slope. (Colors are for dry/moist soil unless otherwise noted.)
Oi--18 to 7 inches; undecomposed needles, leaves, and twigs; common very fine, fine, and medium roots.
Oe--7 inches to 0; decomposed organic mat; many very fine, common fine and medium roots.
E--0 to 3 inches; brown (7.5YR 5/2) gravelly silt loam, pinkish gray (7.5YR 6/2) dry; massive; slightlyhard, friable, slightly sticky, nonplastic; common very fine, few fine and medium roots; few very fine irregular pose; 25 percent pebbles; extremely acid (pH 3.8); abrupt wavy boundary. ( to inches thick)
Bsh1--3 to 5 inches; dark brown (7.5YR 4/4) gravelly silt loam, strong brown (7.5YR 5/6) dry; organic stains of black (5YR 2/1) on 80 percent of the soil matrix, dark reddish brown (5YR 3/2) dry; strong moderate subangular blocky structure; slightly hard, friable, nonsticky, nonplastic, weakly smeary; few very fine, fine, and medium roots; few very fine irregular pores; 20 per;cent pebbles; extremely acid (pH 4.0); clear wavy boundary. ( to inches thick)
Bhs2--5 to 8 inches; dark brown (7.5YR 3/4) very gravelly loam, strong brown (7.5
YR 5/6) dry; organic stains of reddish brown (5YR 4/4) on ped faces, strong brown (7.5YR 4/6) dry; strong very coarse subangular blocky structure; hard, firm, nonsticky, nonplastic, weakly smeary; few very fine, fine, and few medium roots; few very fine irregular pores; 25 percent pebbles and 10 percent cobbles; NaF pH 12.0; very strongly acid (pH 5.0); clear irregular boundary. ( to inches thick)
Bs1--8 to 13 inches; dark yellowish brown (10YR 4/6) very gravelly sandy loam, brownish yellow (10YR 6/6) dry; moderate medium subangular blocky parting to moderate coarse granular structure; slightly hard, friable, nonsticky, nonplastic, weakly smeary; few very fine and very few fine roots; common very fine irregular pores; 30 percentpebbles and 15 percent cobbles; NaF pH 12.0; moderately acid (pH 5.8); clear irregular boundary. ( to inches thick)
Bs2--13 to 19 inches; dark yellowish brown (10YR 4/4) extremely gravelly sandy loam, brownish yellow (10YR 6/6) dry; weak medium subangular blocky structure; slightly hard, friable, nonsticky, nonplastic, weakly smeary, few very fine and very few fine roots; common fine irregular pores; 50 percent pebbles and 15 percent cobbles; NaF pH 12.0; moderately acid (pH 5.6); clear wavy boundary. ( to inches thick)
C1--19 to 22 inches; olive brown (2.5Y 4/4) extremely gravelly loamy sand, light olive brown (2.5Y 5/4) dry; massive; soft, very friable, nonsticky, nonplastic, weakly smeary; very few very fine roots; common very fine irregular pores; 50 percent pebbles and 20 percent cobbles; NaF pH 12.0; moderately acid (pH 5.6); abrupt wavy boundary. ( to inches thick)
C2--22 to 60 inches; olive brown (2.5Y 4/4) extremely gravelly loamy sand, light yellowish brown (2.5Y 6/4) dry; single grain; soft, very friable, nonsticky, nonplastic; very few very fine roots; many very fine and fine irregular pores; 50 percent pebbles and 20 percent cobbles; NaF pH 12.0; moderately acid (pH 5.6)/
TYPE LOCATION: Whatcom County, Washington; about 10 miles southeast of Van Zandt, 2,600 feet south and 700 feet west of the northeast corner of sec. 16, T. 37 N., R. 6 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 42 to 44 degrees F. Thickness of the solum is 10 to 25 inches. Depth to bedrock and thickness of volcanic ash influence is greater than 60 inches. Content of rock fragments in the control section ranges from 40 to 60 percent pebbles and 10 to 20 percent cobbles.
The E horizon has value of 5 or 6 moist, 6 or 7 dry, and chroma of 2 through 4 moist and dry.
The Bhs1 horizon has chroma of 4 through 6 moist and 6 through 8 dry. It is gravelly loam or gravelly silt loam. The organic staining has value of 2 or 3 moist, 3 or 4 dry, and chroma of 1 or 2 moist, 2 through 4 dry.
The Bhs2 has value of 3 or 4 moist, 4 or 5 dry, and chroma of 4 through 6 moist and dry. It is very gravelly loam or very gravelly fine sandy loam.
The Bs horizon has chroma of 4 through 6 moist and dry. It is very gravelly sandy loam or very gravelly fine sandy loam.
The C horizon has hue of 10YR or 2.5Y, value of 3 or 5 moist, 4 through 6 dry, and chroma of 2 through 4 moist and dry. It is very gravelly loamy sand, extremely gravelly loamy sand, very gravelly sand, or extremely gravelly sand.
COMPETING SERIES: These are the similar Jackman, Klawatti, and Twinsi soils. These soils are loamy-skeletal and have less than 6 percent organic carbon in the upper part of the spodic horizon. In addition, Klawatti and Twinsi soils are 20 to 40 inches deep.
GEOGRAPHIC SETTING: Jorgensen soils are on outwash terraces at elevations of 2,200 to 3,100 feet. These soils formed in loess, volcanic ash, and glacial outwash derived from dunite. Jorgense soils ae in a cold, marine climate with cold, wet winters and cool, dry summers. Snow cover lasts from November through May. Average annual precipitation is 90 to 100 inches. Mean January temperature is 31 degrees F, mean July temperature is 58 degrees F, and the mean annual temperature is 42 degrees F. The frost-free season is 90 to 105 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the competing Jackman soils.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff, moderately rapid permeability to the substratum and very rapid through the substratum.
USE AND VEGETATION: Used for timber production. Vegetation is western hemlock,Pacific silver fir, mountain hemlock, and Alaska-cedar, with an understory of t all blue huckleberry, western brackenfern, deer fern, and western rattlesnake plantain.
DISTRIBUTION AND EXTENT: Twin Sisters area, northwestern Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Whatcom County, Washington, 1986.
REMARKS: Diagnostic horizons and features recognized in this pedon are an albic horizon from the mineral surface to 3 inches and a spodic horizon from 3 to 19 inches with more than 6 percent organic carbon in the layer from 3 to 8 inches. These soils were correlated as Jackman VAriant in the July 1983 correlation of Whatcom County Area, Washington.