LOCATION VITRASSUN               OR

Tentative Series
Rev. JD/CEG
08/2021

VITRASSUN SERIES

Landscape--Intermontane Basin
Landform--rock pediments, sand ramps and depressions on rock pediments, scarps on lava flows
Slope--1 to 60 percent
Parent material--volcanic ash and residuum and/or colluvium weathered from tuff breccia, volcanic rock or tuffaceous sandstone
Mean annual precipitation--about 580 mm
Mean annual air temperature--about 5.6 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy, mixed, superactive, frigid Lithic Haploxerolls

TYPICAL PEDON: Vitrassun ashy loam on a rock pediment with a slope of 1 percent at an elevation of 1343.5 m; surface stones cover 0.1 percent of the surface

A--0 to 14 cm; ashy loam, brown (10YR 4/3) dry, dark brown (7.5YR 3/2) moist; weak very thick platy structure parting to moderate fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine irregular pores; 5 percent basalt gravel; neutral (pH 7.0); abrupt wavy boundary

Bw--14 to 37 cm; ashy loam, brown (7.5YR 4/3) dry, dark brown (7.5YR 3/3) moist; moderate very coarse subangular blocky structure parting to moderate fine granular; moderately hard, friable, slightly sticky and moderately plastic; very few very fine and fine roots; many very fine irregular pores; 5 percent basalt gravel; noneffervescent; neutral (pH 7.2); abrupt irregular boundary

2R--37 cm; basalt; few very fine roots in cracks

TYPE LOCATION: Klamath County, Oregon; about 3.0 miles north and 5.0 miles west of the town of Sprague River, OR; about 396 m south and 594 m east of the northwest corner of sec. 1, T.36S., R.9E., Willamette Meridian; Sprague River West, Oregon USGS quadrangle; latitude 42.4831734 degrees north, longitude 121.5963821 degrees west, datum WGS84 (coordinates derived from gps unit)

RANGE IN CHARACTERISTICS:

*Soil Temperature--frigid regime
*Mean annual soil temperature-- 5.3 to 8.0 degrees C
*Mean summer soil temperature-- 9.7 to 12.4 degrees C
*Mean winter soil temperature-- 1.4 to 4.1 degrees C
*Moisture control section--20 to 50 cm; dry in all parts for 60 to 90 or more consecutive days between July and October; moist in the winter.
*Rock fragments--andesite or basalt
*Mollic epipedon--18 to 40 cm thick; includes the Bw horizon(s) in most pedons
*Depth to bedrock--25 to 50 cm

Particle-size control section
*Rock fragment content, weighted average--0 to 35 percent
*Pararock fragment content, weighted average--0 to 5 percent
*Clay content--18 to 35 percent

Estimated properties
*Volcanic glass content--5 to 20 percent
*Ammonium oxalate extractable Al+1/2Fe--0.2 to 0.4 percent
*Moist bulk density--1.0 to 1.2 g/cm3
*1/3-bar bulk density--1.0 to 1.35 g/cm3
*1500 kPa water (air-dried samples)--10 to 15 percent

A horizons (and AB horizons, where present)
*Hue--10YR or 7.5YR moist or dry
*Value--2 to 3 moist, 3 to 5 dry
*Chroma--1 to 3 moist, 1 to 4 dry
*Fine-earth texture--ashy loam, ashy sandy loam
*Clay content--8 to 25 percent
*Paragravel content--0 to 15 percent
*Gravel content--0 to 35 percent
*Cobble content--0 to 10 percent
*Stone content--0 to 5 percent
*Boulder content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
*Thickness--18 to 40 cm

Bw horizons, where present
*Hue--10YR or 7.5YR, moist or dry
*Value--2 to 4 moist or dry
*Chroma--1 to 4 moist or dry
*Fine-earth texture--ashy loam, ashy sandy loam, ashy clay loam
*Clay content--12 to 30 percent
*Paragravel content--0 to 5 percent
*Gravel content--0 to 35 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 5 percent
*Boulder content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
*Thickness--0 to 32 cm

2R horizon
*Cementation class--strongly cemented to indurated

COMPETING SERIES:
Choptie--12 to 18 percent clay in the particle-size control section
Nuss--xeric moisture regime that borders on aridic; less than 5% glass; [((Al + 1/2 Fe)*60) + volcanic glass] is less than 40
Quicksilver--on mountains; 6 to 15 percent clay in the particle-size control section; less than 5% glass; [((Al + 1/2 Fe)*60) + volcanic glass] is less than 40
Sadorus--5 to 12 percent clay in the particle-size control section; mean annual soil temperature 3.9 to 5.5 degrees C; less than 5% glass; [((Al + 1/2 Fe)*60) + volcanic glass] is less than 40
Spaa--silt loam texture in A horizons; accumulation of secondary carbonates below the A horizons; less than 5% glass; [((Al + 1/2 Fe)*60) + volcanic glass] is less than 40
Taylow--dry for less than 60 days following the summer solstice; less than 5% glass; [((Al + 1/2 Fe)*60) + volcanic glass] is less than 40

GEOGRAPHIC SETTING:
Elevation--1280.0 to 1780.0 m
Climate--cold moist winters and cool dry summers
Mean annual air temperature--4.2 to 6.9 degrees C
Mean annual precipitation--355 to 810 mm
Frost-free period--50 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Bly--deep and very deep; on alluvial fans, terraces, and hillslopes
Choptie--12 to 18 percent clay in the particle-size control section; on deflation basins on volcanic fields and maars, and on ridges, low hills, and rock pediments
Crume--deep to diatomite, siltstone, or claystone; on low hills, rock pediments, and strath terraces
Maset--moderately deep to tuffaceous sandstone, with a surface mantle of ashy material; on benches, escarpments, hills, and cinder cones.
Windego--deep or very deep; loamy-skeletal materials with a surface mantle of ashy material; on scarps and hills

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity--moderately high

USE AND VEGETATION:
Use--livestock grazing, wildlife habitat, limited timber production
Vegetation--mountain big sagebrush, curl leaf mountain mahogany, Idaho fescue, wheelers bluegrass, and scattered ponderosa pine and western juniper

DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, Oregon; MLRA 21; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES PROPOSED:
Klamath County, Northern Part, Oregon, 2020
Origin of the name--the name is coined

REMARKS:
Diagnostic horizons and features in this pedon
*Mollic epipedon--zone from 0 to 37 cm
*Volcanic glass--zone from 0 to 37 cm
*Cambic horizon--zone from 14 to 37 cm
*Lithic contact--basalt at 37 cm
*Particle-size control section--25 to 37 cm
*Meets vitrandic subgroup criteria in the Keys to Soil Taxonomy; classifies as a lithic subgroup because lithic keys out before vitrandic

ADDITIONAL DATA:
NASIS SITE ID-- 05-JFD-09; NASIS PEDON ID-- 05OR683009

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National Cooperative Soil Survey
U.S.A.