LOCATION MARTEN OR
Tentative Series
DCR/KMS
01/2017
MARTEN SERIES
Landscape--western Cascade Mountains
Landform--cirque floors, glacially influenced structural benches
Slope--3 to 45 percent
Parent material--colluvium derived from hard extrusive igneous rock mixed with till and volcanic ash throughout
Mean annual precipitation--about 2500 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Medial-skeletal, amorphic Aquandic Haplocryods
TYPICAL PEDON: Marten stony medial loam on a cirque floor with a west-facing, 7-percent slope at an elevation of 1380 m, under coniferous forest vegetation (When described on July 14, 2015, the soil was dry from the surface to a depth of 7 cm and slightly moist below.)
Oi--0 to 4 cm; slightly decomposed plant material; 2 percent andesite stones; abrupt wavy boundary
Oe--4 to 6 cm; moderately decomposed plant material, 50 percent dark grayish brown (10YR 4/2) and 50 percent light gray (10YR 7/1) dry, very dark grayish brown (10YR 3/2) moist; moderate very thick platy structure; nonsticky and nonplastic; common very fine, fine, and coarse and many medium roots; many very fine interstitial pores; 5 percent andesite cobbles and 8 percent andesite stones; abrupt broken boundary
E--6 to 7 cm; stony medial loam, light brownish gray (10YR 6/2) dry, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and coarse and many medium roots; many very fine interstitial pores; 5 percent andesite gravel, 10 percent andesite cobbles, and 10 percent andesite stones; very strongly acid (pH 4.8); abrupt broken boundary (80 percent lateral extent in this pedon)
Bhs--7 to 15 cm; stony medial loam, yellowish brown (10YR 5/4) dry, dark brown (7.5YR 3/3) moist; weak medium subangular blocky structure and moderate very fine granular; soft, very friable, nonsticky and nonplastic; common very fine, fine, and coarse and many medium roots; common very fine to coarse tubular pores; 5 percent andesite gravel, 15 percent andesite cobbles, and 12 percent andesite stones; very strongly acid (pH 4.8); clear wavy boundary
Bw1--15 to 38 cm; very stony medial loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine and medium roots; many very fine interstitial pores; 10 percent andesite gravel, 20 percent andesite cobbles, and 15 percent andesite stones; very strongly acid (pH 4.8); clear wavy boundary
Bw2--38 to 70 cm; very cobbly medial silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure and moderate very fine granular; slightly hard, very friable, nonsticky and slightly plastic; common very fine and medium roots; many very fine tubular pores; 10 percent andesite gravel, 35 percent andesite cobbles, and 5 percent andesite stones; very strongly acid (pH 4.6); clear wavy boundary
2C--70 to 150 cm; very cobbly medial silt loam, very pale brown (10YR 7/3) dry, brown (10YR 5/3) moist; massive; moderately hard, firm, noncemented, slightly sticky and slightly plastic; few very fine roots around fragments; common very fine and few fine tubular pores; 2 percent very fine irregular iron-manganese masses in matrix, yellow (10YR 7/6) dry, strong brown (7.5YR 5/6) moist; 3 percent very fine dendritic noncemented masses along root channels, pale yellow (2.5Y 8/2) dry, very pale brown (10YR 7/3) moist; 10 percent andesite gravel, 35 percent andesite cobbles, and 5 percent andesite stones; strongly acid (pH 5.4)
TYPE LOCATION: Marion County, Oregon, about 7 km north of Detroit, in Willamette National Forest; about 800 m south and 70 m west of the northeast corner of section 15, T. 9 S., R. 5 E., Willamette Meridian; latitude 44.79304, longitude -122.17342, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Dry days--30 to 45 consecutive days following summer solstice
Mean annual soil temperature--6 or 7 degrees C
Thickness of umbric epipedon--25 to 50 cm (below mineral soil surface)
Depth to lithologic discontinuity with firm but not root-limiting till--50 to 100 cm below mineral soil surface
Depth to redoximorphic features--50 to 75 cm below mineral soil surface
Thickness of andic soil properties--greater than 150 cm (below mineral soil surface)
Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.6 to 0.9 g/cm3 above densic layer, greater than 1.0 g/cm3 below lithologic discontinuity
*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--10 to 18 percent above lithologic discontinuity, 18 to 27 percent below lithologic discontinuity
*Rock fragment content--35 to 70 percent
Oi horizon
*Thickness--2 to 5 cm
Oe horizon, and Oa horizon (where present)
*Thickness--0 to 5 cm
E horizon
*Value--3 to 5 moist, 6 or 7 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 15 percent
*Sand content--30 to 50 percent
*Total fragment content--15 to 35 percent
*Gravel content--5 to 20 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 20 percent
*Reaction--4.5 to 5.5
*Thickness--1 to 2 cm
Bhs horizon
*Hue--7.5YR, 10YR
*Value--3 moist, 4 or 5 dry
*Chroma--3 moist, 3 or 4 dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 15 percent
*Sand content--30 to 50 percent
*Total fragment content--15 to 60 percent
*Gravel content--5 to 30 percent
*Cobble content--0 to 30 percent
*Stone content--0 to 30 percent
*Organic carbon content--4 to 6 percent
*Reaction--4.5 to 5.5
*Thickness--5 to 25 cm
Bw horizon
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--3 or 4 moist or dry
*Fine-earth texture--medial silt loam, medial loam
*Clay content--10 to 18 percent
*Sand content--25 to 50 percent
*Total fragment content--35 to 70 percent
*Gravel content--5 to 30 percent
*Cobble content--10 to 40 percent
*Stone content--0 to 30 percent
*Boulder content--0 to 10 percent
*Organic carbon content--2 to 4 percent
*Reaction--4.5 to 5.5
*Thickness--35 to 75 cm
2C horizon
*Hue--10YR, 2.5Y
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--medial silt loam, medial loam
*Clay content--18 to 27 percent
*Sand content--20 to 35 percent
*Total fragment content--35 to 70 percent
*Gravel content--5 to 30 percent
*Cobble content--15 to 40 percent
*Stone content--0 to 20 percent
*Organic carbon content--0 to 10 percent
*Redoximorphic features--common iron-manganese masses
*Reaction--5.0 to 6.0
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1400 to 1800 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--2300 to 2900 mm
Mean annual air temperature--4 to 6.5 degrees C
Frost-free period--45 to 75 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Talapus--10 to 15 percent organic matter in upper part of umbric epipedon; in concave positions of cirque floors
Thader--50 to 100 cm to lithic contact; on north-facing cirque headwalls and mountain slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--below a depth of 50 to 100 cm in December through May
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high to lithologic discontinuity and moderately high below
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Potential natural vegetation--Pacific silver fir, Douglas-fir, noble fir, blue huckleberry, dwarf bramble, beargrass; commonly support a Pacific silver fir/blue huckleberry/beargrass (CHS 251) plant association (Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Marion County, Oregon; 2015; name from Marten Buttes, near the type location
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--31 to 70 cm
*Albic horizon--zone from 6 to 7 cm
*Spodic horizon--zone from 7 to 15 cm
*Umbric epipedon--zone from 7 to 38 cm
*Depth to lithologic discontinuity--70 cm
*Redoximorphic concentrations--zone from 70 to 150 cm
*Andic soil properties--zone from 6 to 150 cm
*Volcanic glass--zone from 5 to 150 cm
08/2016--Horizons above the lithologic discontinuity meet criteria 2 for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. The horizon below the lithologic discontinuity meets criteria 3 for andic soil properties. Further investigation is needed to determine the extent of ash influence.
ADDITIONAL DATA: Typical pedon user ID--2015OR047797
National Cooperative Soil Survey
U.S.A.