LOCATION ICECAP OR
Tentative Series
DRJ/KMS
01/2017
ICECAP SERIES
Landscape--western Cascade Mountains
Landform--glacially influenced structural benches
Slope--2 to 45 percent
Parent material--colluvium derived from igneous rock mixed with till and volcanic ash throughout
Mean annual precipitation--about 2600 mm
Mean annual air temperature--about 6 degrees C
Depth class--moderately deep to lithic contact
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial-skeletal, amorphic Typic Haplocryands
TYPICAL PEDON: Icecap very gravelly medial loam on a 52-percent, forested slope at an elevation of 1245 m
Oe--0 to 2 cm; moderately decomposed plant material; abrupt wavy boundary
A--2 to 31 cm; very gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; very friable, loose, slightly sticky and nonplastic; many very fine, common medium and coarse, and few fine roots; many very fine and fine irregular pores and common medium and coarse tubular pores; 40 percent andesite gravel and 5 percent andesite cobbles; clear wavy boundary
AB--31 to 51 cm; very gravelly medial loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; very friable, loose, slightly sticky and nonplastic; many very fine, common medium, and few fine and coarse roots; many very fine dendritic tubular and irregular pores and common fine, medium, and coarse tubular pores; 40 percent andesite gravel and 5 percent andesite cobbles; gradual wavy boundary
Bw--51 to 99 cm; extremely cobbly medial loam, brownish yellow (10YR 6/6) dry, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; very friable, loose, slightly sticky and nonplastic; few very fine and fine roots; common very fine and fine dendritic tubular and irregular pores and few medium tubular pores; 35 percent andesite gravel, 20 percent andesite cobbles, and 10 percent andesite stones; abrupt wavy boundary
2R--99 cm; andesite
TYPE LOCATION: Linn County, Oregon, about 38.5 km east of Sweet Home, on OR Highway 20; about 445 m north and 725 m west of the southeast corner of section 34, T. 13 S., R. 5 E.; latitude 44.3925556, longitude -122.1963611, 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--4 to 6 degrees C
Thickness of umbric epipedon--25 to 50 cm
Reaction--5.0 to 6.0 throughout all mineral horizons
Depth to lithic contact--50 to 100 cm
Thickness of andic soil properties--50 to 100 cm (below mineral soil surface)
Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.60 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 the 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 75 percent
O horizon
*Thickness--1 to 6 cm
A horizon
*Hue--7.5YR, 10YR
*Value--2 to 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Clay content--15 to 20 percent
*Sand content--30 to 45 percent
*Total fragment content--35 to 50 percent
*Gravel content--25 to 45 percent
*Cobble content--5 to 15 percent
*Stone content--0 to 5 percent
*Thickness--20 to 36 cm
AB horizon
*Hue--7.5YR, 10YR
*Value--2.5 to 4 moist, 4 to 6 dry
*Chroma--2 to 4 moist, 3 or 4 dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--18 to 27 percent
*Sand content--20 to 35 percent
*Total fragment content--35 to 60 percent
*Gravel content--20 to 50 percent
*Cobble content--5 to 20 percent
*Stone content--0 to 5 percent
*Thickness--0 to 36 cm
Bw horizon
*Hue--7.5YR, 10YR
*Value--3 to 5 moist, 5 to 7 dry
*Chroma--3 or 4 moist, 3 to 6 dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--18 to 27 percent
*Sand content--15 to 35 percent
*Total fragment content--50 to 75 percent
*Gravel content--20 to 50 percent
*Cobble content--10 to 40 percent
*Stone content--0 to 20 percent
*Thickness--30 to 50 cm
COMPETING SERIES:
Divers--greater than 150 cm deep to lithic contact; ochric epipedon
Highcamp--greater than 100 cm deep to lithic contact
Holderman--ochric epipedon
Hummington--umbric epipedon greater than 50 cm thick
Idanha--greater than 150 cm deep to lithic contact
Kinzel--greater than 150 cm deep to lithic contact; less than 18 percent clay in particle-size control section
Oatman--greater than 100 cm deep to lithic contact; ochric epipedon
Ohana--50 to 100 cm deep to densic layer; ochric epipedon
Otwin--ochric epipedon; bulk density of 0.85 to 1.00 g/cm3 throughout
GEOGRAPHIC SETTING:
Elevation--1100 to 1500 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--2300 to 2900 mm
Mean annual air temperature--5.5 to 7.5 degrees C
Frost-free period--75 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Longbow--less than 35 percent rock fragments; greater than 150 cm deep to lithic contact; in linear and slightly concave positions
Idanha--greater than 150 cm deep to lithic contact; in linear and slightly convex positions
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--watershed, recreation, wildlife habitat, timber production
Potential natural vegetation--Douglas-fir, western hemlock, Pacific silver fir, noble fir, Pacific rhododendron, Cascade Oregon grape, Alaska blueberry, bunchberry dogwood, starry false lily of the valley, beargrass, prince's pine, twinflower
DISTRIBUTION AND EXTENT: Central western Cascade Mountains, Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from Ice Cap Creek in Willamette National Forest
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 2 to 99 cm
*Umbric epipedon--zone from 2 to 51 cm
*Cambic horizon--zone from 51 to 99 cm
*Andic soil properties--zone from 2 to 99 cm
*Volcanic glass--zone from 2 to 99 cm
*Depth to lithic contact--99 cm
06/2016--Assumed to meet criteria 2 (no ash required) for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. It is also assumed that enough ash is present for the soils to meet criteria 3. Additional lab data is needed to confirm the degree of ash influence.
Reaction was not recorded during this observation; further observation is needed.
ADDITIONAL DATA: Type location User site ID--2013OR043002
National Cooperative Soil Survey
U.S.A.