LOCATION CADENZA                 OR

Tentative Series
JGM/KMS
01/2017

CADENZA SERIES

Landscape--western Cascade Mountains
Landform--mountain slopes, drainageways of mountain slopes, complex landslides
Slopes--20 to 90 percent
Parent material--colluvium or slide deposits derived from igneous rock mixed with volcanic ash in upper part
Mean annual precipitation--2100 mm
Mean annual air temperature--7 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Andic Humudepts

TYPICAL PEDON: Cadenza very gravelly medial loam on a north-facing, forested, 42-percent slope at an elevation of 915 m (The soil was dry throughout when described on September 6, 2012.)

Oi--0 to 5 cm; slightly decomposed plant material; clear smooth boundary

A1--5 to 23 cm; gravelly medial loam, very dark grayish brown (10YR 3/2) dry, very dark brown (10YR 2/2) moist; moderate very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine to medium and common coarse and very coarse roots; many very fine and fine irregular pores; 20 percent andesite gravel and 5 percent andesite cobbles; clear smooth boundary

A2--23 to 34 cm; gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine to medium roots and common coarse and very coarse roots; many very fine tubular pores; 20 percent andesite gravel and 10 percent andesite cobbles; clear wavy boundary.

2Bw1--34 to 52 cm; very cobbly loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to medium and few coarse and very coarse roots; many very fine tubular pores; 15 percent andesite gravel and 25 percent andesite cobbles; clear wavy boundary

2Bw2--52 to 75 cm; very cobbly loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to medium and few coarse and very coarse roots; many very fine tubular pores; 20 percent andesite gravel and 35 percent andesite cobbles; clear wavy boundary

2BC--75 to 118 cm; extremely cobbly loam, strong brown (7.5YR 5/8) dry, strong brown (7.5YR 4/6) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine to very coarse roots; common very fine tubular pores and many irregular pores; 30 percent andesite gravel and 35 percent andesite cobbles; gradual wavy boundary

2C--118 to 200 cm; extremely cobbly loam, strong brown (7.5YR 5/8) dry, strong brown (7.5YR 4/6) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine to medium roots; many irregular pores; 35 percent andesite gravel and 35 percent andesite cobbles

TYPE LOCATION: Linn County, Oregon, about 3.8 km north-northwest of Tidbits Mountain; 310 m south and 375 m east of the northwest corner of section 4, T. 15 S., R. 4 E.; latitude 44.299028, longitude -122.340056, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--5 to 8 degrees C
Thickness of umbric epipedon--25 to 50 cm (below mineral soil surface)
Thickness of andic soil properties--18 to 34 cm (below mineral soil surface)
Reaction--pH 5.1 to 6.0 throughout all mineral horizons

Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.70 to 0.90 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate extractable Al + Fe--2 to 4 percent
*15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*0.02- to 2.0-mm fraction--greater than 30 percent
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent

Particle-size control section
*Clay content--18 to 27 percent
*Total fragment content--35 to 70 percent

O horizon
*Thickness--1 to 8 cm

A horizon
*Hue--10YR, 7.5YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Clay content--18 to 27 percent
*Sand content--25 to 50 percent
*Total fragment content--15 to 50 percent
*Gravel content--10 to 40 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 5 percent
*Thickness--18 to 36 cm

2Bw1 horizon
*Hue--10YR, 7.5YR
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 to 4 moist or dry
*Clay content--18 to 27 percent
*Sand content--25 to 50 percent
*Total fragment content--35 to 60 percent
*Gravel content--15 to 40 percent
*Cobble content--10 to 25 percent
*Stone content--0 to 5 percent
*Thickness--0 to 20 cm

2Bw2 horizon
*Hue--10YR, 7.5YR
*Value--4 to 6 moist, 5 to 7 dry
*Chroma--3 to 6 moist or dry
*Clay content--18 to 27 percent
*Sand content--25 to 50 percent
*Total fragment content--35 to 70 percent
*Gravel content--15 to 40 percent
*Cobble content--20 to 45 percent
*Stone content--0 to 10 percent
*Thickness--20 to 130 cm

2BC and 2C horizons
*Hue--7.5YR to 2.5Y
*Value--4 to 6 moist, 5 to 7 dry
*Chroma--4 to 8 moist or dry
*Clay content--18 to 27 percent
*Sand content--25 to 50 percent
*Total fragment content--35 to 70 percent
*Gravel content--15 to 40 percent
*Cobble content--20 to 45 percent
*Stone content--0 to 10 percent

COMPETING SERIES:
Dougan, Fernwood--moderately deep to lithic bedrock
Zygore--less than 18 percent clay in particle-size control section

GEOGRAPHIC SETTING:
Elevation--700 to 1200 m
Climate--warm, moist summers; cool, wet winters
Mean annual precipitation--1900 to 2300 mm
Mean annual air temperature--6 to 9 degrees C
Frost-free period--90 to 135 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Browder--less than 35 percent fragments in particle-size control section; on more gently sloping mountain slopes
Dougan--moderately deep to lithic bedrock; less than 18 percent clay in particle-size control section; in convex positions
Aschoff--mesic soil temperature regime; in similar landform positions
Coolcamp--andic soil properties throughout; on mountain slopes derived from colluvium mixed with till

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

USE AND VEGETATION:
Use--timber production, recreation, wildlife habitat
Potential natural vegetation--western hemlock, Douglas-fir, Pacific rhododendron, salal, dwarf Oregon grape, red huckleberry, swordfern, twinflower, vanilla leaf, trillium; commonly support a western hemlock/rhododendron-dwarf Oregon grape northwest Oregon Cascades (CHS356) plant association

DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; moderate extent

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

SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; 2016; name from local stream

REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Umbric epipedon--zone from 5 to 34 cm
*Cambic horizon--zone from 34 to 118 cm
*Andic soil properties--zone from 5 to 34 cm
*Volcanic glass--zone from 5 to 34 cm
*Depth to lithologic discontinuity--34 cm

7/2016--These soils classify as Andic Humudepts according to criteria 2 for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. Lab data for similar soils indicates the presence of volcanic ash. Further investigation is needed to confirm the taxonomic classification.

ADDITIONAL DATA: Typical pedon user site ID--2012OR043214

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National Cooperative Soil Survey
U.S.A.