LOCATION PIPEROCK OR
Tentative Series
JGM/KMS
01/2017
PIPEROCK SERIES
Landscape--western Cascade Mountains
Landform--mountain slopes
Slope--45 to 90 percent
Parent material--colluvium derived from hard extrusive igneous rock and/or welded tuff
Mean annual precipitation--1700 mm
Mean annual air temperature--about 10 degrees C
Depth class--moderately deep to lithic contact
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Typic Dystrudepts
TYPICAL PEDON: Piperock gravelly loam on a forested, southeast-facing, 53-percent slope at an elevation of 649 m
Oi--0 to 2 cm; slightly decomposed plant material; common coarse roots; 10 percent welded tuff gravel; abrupt smooth boundary
A--2 to 11 cm; gravelly loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine to coarse roots; common fine and medium irregular pores and many very fine interstitial pores; 20 percent welded tuff gravel; moderately acid (pH 5.6); clear smooth boundary
BA--11 to 22 cm; very gravelly loam, brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and coarse and many medium roots; many very fine and common fine and medium irregular pores; 40 percent welded tuff gravel; moderately acid (pH 5.6); clear smooth boundary
Bw1--22 to 40 cm; very gravelly loam, yellowish brown (10YR 5/4) dry, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and fine and many medium roots; many very fine and common fine and medium irregular pores; 45 percent welded tuff gravel and 5 percent welded tuff cobbles; moderately acid (pH 5.8); clear wavy boundary
Bw2--40 to 80 cm; extremely cobbly loam, yellowish brown (10YR 5/4) dry, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and fine and many medium roots; many very fine to medium irregular pores; 20 percent welded tuff gravel, 40 percent welded tuff cobbles, and 5 percent welded tuff stones; moderately acid (pH 5.8); abrupt wavy boundary
R--80 cm; very strongly cemented welded tuff
TYPE LOCATION: Linn County, Oregon, about 3.3 km north-northwest of White Bull Mountain; 300 m north and 150 m west of the southeast corner of section 10, T. 11 S., R. 4 E.; latitude 44.6196390, longitude -122.3075560, 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--8 to 10 degrees C
Depth to lithic contact--50 to 100 cm below mineral soil surface
Reaction--5.6 to 6.5 throughout all mineral horizons
Particle-size control section
*Clay content--8 to 18 percent
*Total fragment content--40 to 70 percent
O horizon
*Thickness--1 to 8 cm
A and BA horizons
*Hue--10YR, 7.5YR
*Value--3 to 5 moist, 4 to 7 dry
*Chroma--2 to 4 moist, 2 or 3 dry
*Fine-earth texture--loam, sandy loam
*Clay content--8 to 18 percent
*Sand content--40 to 60 percent
*Total fragment content--15 to 60 percent
*Gravel content--15 to 50 percent
*Cobble content--0 to 20 percent
*Thickness--10 to 24 cm
Bw horizon
*Hue--10YR, 7.5YR
*Value--4 or 5 moist, 5 to 8 dry
*Chroma--3 or 4 moist, 2 to 4 dry
*Fine-earth texture--loam, sandy loam
*Clay content--8 to 18 percent
*Sand content--35 to 60 percent
*Total fragment content--40 to 70 percent
*Gravel content--20 to 55 percent
*Cobble content--5 to 40 percent
*Stone content--0 to 10 percent
COMPETING SERIES:
Chamate--greater than 150 cm deep to lithic contact
Remote--50 to 100 cm deep to paralithic contact; 15 to 35 percent clay in particle-size control section
GEOGRAPHIC SETTING:
Elevation--200 to 800 m
Climate--warm, wet winters; hot, moist summers
Mean annual precipitation--1500 to 1900 mm
Mean annual air temperature--9 to 11 degrees C
Frost-free period--135 to 165 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Aschoff--umbric epipedon; andic soil properties in upper part; on side slopes of mountains with interbedded soft tuff and hard extrusive igneous rock
Chamate--greater than 150 cm deep to lithic contact; on similar landforms
Kinney--umbric epipedon; andic soil properties in upper part; less than 35 percent rock fragments in particle-size control section; on side slopes of mountains with interbedded soft tuff and hard extrusive igneous rock
DRAINAGE AND PERMEABILITY:
Drainage class--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Potential natural vegetation--Douglas-fir, western hemlock, salal, dwarf Oregon grape, western swordfern, trailing blackberry
DISTRIBUTION AND EXTENT: Western Cascade Mountains in Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from local bedrock pillar referred to as Pipe Rock
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 22 to 80 cm
*Depth to lithic contact--80 cm
*Particle-size control section--zone from 26 to 80 cm
08/2016--Some investigation should be done to determine whether the soils have an ash influence, given the levels of ash in nearby soils.
ADDITIONAL DATA: Type location user site ID--2014OR043862
National Cooperative Soil Survey
U.S.A.