LOCATION HOWLOCK OR
Tentative Series
Rev. JMW/CEG
02/2025
HOWLOCK SERIES
Landscape--Cascade mountains
Landform--tephra volcanic fields on mountains
Slope--0 to 15 percent
Parent material--coarse pumiceous volcanic ash and pumice parafragments
Mean annual precipitation--about 1320 mm
Mean annual air temperature--about 2.8 degrees C
Depth class--very deep
Drainage class--excessively drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy-pumiceous, amorphic Andic Haplocryods
TYPICAL PEDON: Howlock ashy sandy loam on a forested tephra volcanic field on a mountain flank with a slope of 5 percent and an elevation of 2012 m
Oi--0 to 2 cm; slightly decomposed plant material consisting of a loose mat of pine and fir needles; abrupt wavy boundary
Oe--2 to 5 cm; moderately decomposed plant material; abrupt wavy boundary
E--5 to 10 cm; ashy sandy loam, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; moderate thick platy structure; soft, very friable, slightly sticky and nonplastic; common very fine, fine, medium, coarse, and very coarse roots; common very fine and fine dendritic tubular pores; 10 percent pumice paragravel; noneffervescent; very strongly acid (pH 4.5); abrupt wavy boundary
Bs--10 to 18 cm; paragravelly ashy coarse sandy loam, strong brown (7.5YR 5/6) dry, strong brown (7.5YR 4/6) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; few very fine and fine and many medium, coarse, and very coarse roots; common very fine and fine dendritic tubular pores; 30 percent pumice paragravel; noneffervescent; moderately acid (pH 5.6); clear smooth boundary
BC1--18 to 40 cm; extremely paragravelly ashy coarse sand, 60 percent yellow (10YR 7/6) and 40 percent light gray (10YR 7/2) dry, 60 percent yellowish brown (10YR 5/6) and 40 percent pale brown (10YR 6/3) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine, and few medium roots; many interstitial pores; 75 percent medium pumice paragravel; noneffervescent; neutral (pH 6.9); clear smooth boundary
BC2--40 to 110 cm; extremely paragravelly ashy coarse sand, 60 percent light gray (10YR 7/2) and 40 percent yellow (10YR 7/6) dry, 60 percent pale brown (10YR 6/3) and 40 percent yellowish brown (10YR 5/6) moist; single grain; loose, nonsticky and nonplastic; few very fine, fine, and medium roots; many interstitial pores; 75 percent pumice paragravel and 5 percent pumice paracobbles; noneffervescent; neutral (pH 6.8); clear smooth boundary
C--110 to 200 cm; extremely paragravelly ashy coarse sand, pale yellow (2.5Y 8/2) dry, and pale yellow (2.5Y 7/3) moist; single grain; loose, nonsticky and nonplastic; many interstitial pores; 85 percent pumice paragravel; noneffervescent; neutral (pH 7.3)
TYPE LOCATION: Klamath County, Oregon; about 210.3 m south and 83.8 m east of the northwest corner of sec. 7, T.27S., R.7E., Willamette Meridian; Burn Butte, Oregon USGS quadrangle; Latitude 43.2521095 degrees north, longitude 121.9425659 degrees west, datum WGS84 (coordinates derived from GPS unit)
RANGE IN CHARACTERISTICS:
*Soil Temperature: cryic regime
*Mean annual soil temperature-- 1.1 to 6.7 degrees C
*Mean summer soil temperature-- 3.3 to 8.9 degrees C
*Mean winter soil temperature-- -2.8 to 2.8 degrees C
*Moisture control section--30 to 90 cm; not dry in any part for as long as 90 days in normal years; dry in all parts for 30 to 45 consecutive days in August, September, or October
*Rock fragments--pumice paragravel and paracobbles; andesite gravel and cobbles
*Ochric epipedon
Particle-size control section
*Rock fragment content--0 to 5 percent
*Pararock fragment content--35 to 80 percent
Estimated andic properties of E and B horizons
*Thickness--35 to 130 cm
*Ammonium oxalate extractable Al plus 1/2 Fe--1.0 to 2.5 percent
*.02- to 2.0-mm fraction--60 to 90 percent
*medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P retention--50 to 85
*Volcanic glass content--60 to 90 percent
*Moist bulk density--0.75 to 0.9 g/cm3
*1/3-bar bulk density--0.8 to 0.8 g/cm3
*1500 kPa water (air-dried samples)--3 to 12 percent
E horizon
*Hue--10YR, moist or dry
*Value--4 to 8 moist, 5 to 8 dry
*Chroma--1 or 2, moist or dry
*Fine-earth texture--ashy sandy loam, ashy loamy sand
*Clay content--1 to 15 percent
*Total content of rock and pararock fragments--2 to 14 percent
*Paragravel content--2 to 14 percent
*gravel content--0 to 10 percent
*Reaction--very strongly acid to strongly acid (pH 4.5 to 5.5)
*Thickness--1 to 15 cm
Bs horizon
*Hue--5YR or 7.5YR, moist or dry
*Value--3 to 5 moist, 4 to 6 dry
*Chroma--1 to 4, moist or dry
*Fine-earth texture--ashy sandy loam, ashy coarse sandy loam, ashy loamy coarse sand
*Clay content--1 to 15 percent
*Total content of rock and pararock fragments--10 to 40 percent
*Paragravel content--10 to 35 percent
*Paracobble content--0 to 2 percent
*gravel content--0 to 10 percent
*Reaction--strongly acid to moderately acid (pH 5.1 to 5.9)
*Thickness--3 to 30 cm
BC horizons
*Hue--10YR, moist or dry
*Value--3 to 6 moist, 4 to 7 dry
*Chroma--2 to 6, moist or dry
*Fine-earth texture--ashy loamy sand, ashy loamy coarse sand, ashy coarse sand
*Clay content--0 to 5
*Total content of rock and pararock fragments--20 to 85 percent
*Paragravel content--20 to 80 percent
*Paracobble content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.0)
*Thickness--12 to 120 cm
C horizon
*Hue--10YR or 2.5Y, moist or dry
*Value--3 to 7 moist, 4 to 8 dry
*Chroma--2 to 8, moist or dry
*Fine-earth texture--ashy loamy sand, ashy loamy coarse sand, ashy coarse sand
*Clay content--0 to 5
*Total content of rock and pararock fragments--70 to 95 percent
*Paragravel content--70 to 95 percent
*Paracobble content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
COMPETING SERIES:
There are no competing series
GEOGRAPHIC SETTING:
Elevation--1524.0 to 2438.4 m
Climate--cold wet winters and cool moist summers
Mean annual air temperature-- 0 to 5.7 degrees C
Mean annual precipitation--860 to 1780 mm
Frost-free period--10 to 50 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Castlecrest--ashy; contains no spodic materials; similar landforms
Timbercrater--contains no spodic materials; similar landforms and parent materials
Unionpeak--ashy; very weakly to weakly cemented duripan between 50 and 100 cm from the soil surface; similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--excessively drained
Saturated hydraulic conductivity (Ksat)--very high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Vegetation--mountain hemlock, Shasta red fir, lodgepole pine, and very sparse to nonexistent understory plants
DISTRIBUTION AND EXTENT: Olympic and Cascade Mountains, Oregon; MLRA 3; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Klamath County, Northern Part, Oregon, 2020
Origin of the name--derived from a nearby physiographic feature, Howlock Mountain
REMARKS:
Diagnostic horizons and features in this pedon
*Ochric epipedon
*Albic horizon--zone from 5 to 10 cm
*Spodic horizon--zone from 10 to 18 cm
*Andic soil properties--zone from 5 to 110 cm
*Volcanic glass--zone from 5 to 200 cm
*Particle-size control section--30 to 105 cm
ADDITIONAL DATA:
NASIS SITE ID--10-JMW-01; NASIS PEDON ID--10OR683050
National Cooperative Soil Survey
U.S.A.