LOCATION NERRAD                  OR

Tentative Series
KLM/KMS
02/2025

NERRAD SERIES

Landscape--mountains, plateaus
Landform--mountain slopes, lava plateaus, low hills, benches
Slope--0 to 70 percent
Parent material--colluvium and residuum derived from basalt with an influence of volcanic ash in the surface
Mean annual precipitation--about 560 mm
Mean annual air temperature--about 5 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Argixerolls

TYPICAL PEDON: Nerrad ashy sandy loam, forested

Oi--0 to 3 centimeters; slightly decomposed leaves, pine needles, grass, and twigs; abrupt wavy boundary.

A1--3 to 8 centimeters; ashy sandy loam; brown (7.5YR 5/3), dry, dark brown (7.5YR 3/3), moist; weak very fine granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine roots throughout; many very fine interstitial and tubular pores; 5 percent gravels; slightly acid (pH 6.4); clear wavy boundary.

A2--8 to 23 centimeters; ashy loam; brown (7.5YR 5/3), dry, dark brown (7.5YR 3/3), moist; moderate fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine roots throughout and few coarse roots throughout; many very fine to fine dendritic tubular pores, common fine and medium dendritic tubular pores; 5 percent gravels and 5 percent cobbles; slightly acid (pH 6.5); clear wavy boundary.

2Bt1--23 to 48 centimeters; very cobbly clay loam; dark yellowish brown (10YR 4/4), dry, dark yellowish brown (10YR 3/4) broken face, moist; moderate medium subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; many very fine and fine roots between peds, common medium to coarse roots between peds; common very fine to medium dendritic tubular pores, few coarse dendritic tubular pores; 30 percent distinct clay films on faces of peds; 5 percent gravels and 45 percent cobbles; neutral (pH 6.8); clear wavy boundary.

2Bt2--48 to 58 centimeters; extremely cobbly clay loam; brown (7.5YR 4/4), dry, dark brown (7.5YR 3/4), moist; moderate medium subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; 40 percent distinct clay films on faces of peds; 10 percent gravels and 70 percent cobbles; neutral (pH 6.8); abrupt wavy boundary.

2R--58 centimeters; basalt bedrock.

TYPE LOCATION: Crook County, Oregon, in the SE1/4, NW1/4, SW1/4 of section 2, T. 15S, R. 20E; Latitude 44.2958336, Longitude -120.3017197, WGS84 Datum, (coordinates determined from GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 to 5 degrees C
Soil Moisture--usually moist, but dry 45 to 60 consecutive days following summer solstice in all parts between depths of 10 and 30 cm
Mollic epipedon--18 to 50 cm
Depth to lithic contact--50 to 100cm
Reaction--slightly acid to neutral throughout
Thickness of volcanic ash influenced layers--18 to 36 cm

Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.4 to 0.8 percent
*0.02 to 2.0 mm fraction--greater than 30 percent
*Volcanic glass in the 0.02 to 2.0 mm fraction--15 to 40 percent
Particle-size control section
*Content of clay--20 to 35 percent
*Total fragments--35 to 80 percent
*Fragment types--andesite, basalt, rhyolite, welded tuff

A horizons
*Hue--7.5YR, 10YR
*Value--3 to 5 dry, 2 or 3 moist
*Chroma--2 or 3 moist or dry
*Fine earth texture--ashy sandy loam, ashy loam
*Clay--15 to 25 percent
*Sand--40 to 80 percent
*Organic matter--2 to 5 percent
*Total fragments--0 to 35 percent
*Gravel--0 to 35 percent
*Cobbles--0 to 25 percent
*Stones--0 to 5 percent
*Thickness--combined thickness of A horizons 18 to 36 cm

2Bt horizons
*Hue--7.5YR, 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--2 to 4 moist and dry
*Fine earth texture--loam, sandy clay loam, clay loam
*Clay--20 to 35 percent
*Sand--25 to 60 percent
*Organic matter--0.5 to 2.0 percent
*Total fragments--35 to 80 percent
*Gravel--0 to 45 percent
*Cobbles--15 to 70 percent
*Combined thickness--14 to 80 cm

COMPETING SERIES:
Barneycreek--no lithic contact within a depth of more than 150 cm (very deep)
Getaway--100 to 150 cm or more (deep, very deep) to a lithic contact (basalt, andesite, andesitic basalt)
Harveycreek--dry 60 to 90 days following summer solstice
Klickson--100 to 150 cm or more (deep, very deep) to a lithic contact (basalt)
Klicker--averages less than 40 percent sand in surface horizons; dry 60 to 75 days following summer solstice
Larabee--averages less than 40 percent sand in surface horizons; acid oxalate Al plus 1/2 Fe of 0.8 to 1.5 percent
Millerflat, Ryespur--no lithic contact within a depth of more than 150 cm
Stemilt--100 to 150 cm or more (deep, very deep) to a lithic contact (basalt, andesite)
Sycreek--89 to 114 cm (moderately deep, deep) to densic material
Wileyflat--contains channers and flagstone fragments of rhyolite; dry 75 to 90 days following summer solstice

GEOGRAPHIC SETTING:
Elevation--1100 to 1700 m
Climate--cool, moist winters and warm, dry summers
Mean annual precipitation--350 to 560 mm
Mean annual air temperature--4 to 6 degrees C
Frost-free period--50 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Anatone--occurs on plateaus, ridges, mountain slopes; 25 to 50 cm to lithic contact
Shotsprings--occur on mountain slopes; averages greater than 35 percent clay and coarse fragments in the particle size control section

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--Timber production and wildlife habitat
Native vegetation--Douglas-fir, grand fir, pinegrass, elk sedge, common snowberry, oceanspray

DISTRIBUTION AND EXTENT: Central Oregon, Ochoco Mountains, MLRA43C. The soil is of small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Crook County, Oregon; 2024

REMARKS:
Diagnostic horizons and other features in this pedon
*Mollic epipedon--3 to 36 cm
*Argillic horizon--36 to 99 cm
*Depth to lithic contact--99 cm
*Vitrandic feature--zone from 3 to 36 cm

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National Cooperative Soil Survey
U.S.A.