LOCATION ZANGO                   OR

Established Series
Rev. JGM/AON/KMS
01/2017

ZANGO SERIES

Landscape--western Cascade Mountains
Landform--mountains
Slope--60 to 90 percent
Parent material--colluvium derived from light-colored tuff, breccia, and andesite
Mean annual precipitation--about 1900 mm
Mean annual air temperature--about 10 degrees C
Depth class--shallow
Drainage class--excessively well drained, well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Lithic Dystrudepts

TYPICAL PEDON: Zango very gravelly sandy loam, forested

Oi--0 to 3 cm; slightly decomposed plant material consisting of salal leaves, stems of common beargrass, and western brackenfern

A--3 to 28 cm; very gravelly sandy loam, white (10YR 8/1) dry, gray (10YR 5/1) moist; weak fine and medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine to medium roots; many very fine irregular pores; 40 percent gravel; moderately acid (pH 5.6); clear wavy boundary

Bw--28 to 46 cm; very gravelly loam, pink (7.5YR 7/4) dry, brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine to medium roots; common very fine and fine tubular pores; 45 percent gravel; strongly acid (pH 5.4); abrupt wavy boundary

2R--46 cm; hard welded tuff

TYPE LOCATION: Douglas County, Oregon, along the Bureau of Land Management (BLM) 25.1 Road, 1.5 km up from BLM 1.0 Road; 488 m east and 335 m south of the northwest corner of section 30, T. 24 S., R. 1 W., Willamette Meridian; latitude 43.4635138, longitude -122.8619250, datum WGS 84 (coordinates estimated using PLSS details)

RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--8 to 13 degrees C
Depth to bedrock--25 to 50 cm below mineral soil surface
Reaction--5.0 to 6.0 throughout all mineral horizons

Particle-size control section
*Clay content--18 to 30 percent
*Total fragment content--35 to 60 percent, dominantly gravel

A horizon
*Hue--10YR, 7.5YR
*Value--4 to 6 moist, 6 to 8 dry
*Chroma--1 to 3 moist or dry
*Clay content--10 to 20 percent
*Total fragment content--20 to 55 percent
*Gravel content--20 to 45 percent
*Cobble content--0 to 10 percent
*Thickness--13 to 25 cm

Bw horizon
*Hue--10YR, 7.5YR
*Value--4 or 5 moist, 6 to 8 dry
*Chroma--1 to 3 moist or dry
*Fine-earth texture--loam, clay loam
*Clay content--18 to 30 percent
*Total fragment content--35 to 60 percent
*Gravel content--30 to 45 percent
*Cobble content--0 to 25 percent
*Thickness--13 to 30 cm

COMPETING SERIES:
Grouslous--27 to 35 percent clay; no cobbles in Bw horizon; formed in metasedimentary rock

GEOGRAPHIC SETTING:
Elevation--150 to 1000 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--1500 to 2300 mm
Mean annual air temperature--7 to 12 degrees C
Mean January air temperature--3 degrees C
Mean July air temperature--17 degrees C
Frost-free period--135 to 220 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Blachly--greater than 35 percent clay; very deep
Holderman--cryic soil temperature regime; moderately deep to bedrock; umbric epipedon
Honeygrove--greater than 35 percent clay; very deep
Kilchis--umbric epipedon; hue redder than 7.5YR in B horizon
Klickitat--umbric epipedon; more than 100 cm deep to bedrock
Shivigny--argillic horizon; greater than 35 percent clay
Winberry--cryic soil temperature regime

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none within profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--timber production, wildlife habitat, watershed
Potential natural vegetation--Douglas-fir, western hemlock, western redcedar, salal, vine maple, red huckleberry, western swordfern

DISTRIBUTION AND EXTENT: Western slopes of Cascade Mountains, Oregon; moderate extent

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Linn County, Oregon; 1983

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 28 to 46 cm
*Depth to lithic contact--46 cm

7/2016--This official series description has been updated according to SSR01 Technical Note 11. The competing series section was updated to reflect taxonomic changes in other series. Further investigation is recommended to determine whether the series spans both the mesic and frigid soil temperature regimes and to verify the lack of volcanic ash influence.

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National Cooperative Soil Survey
U.S.A.