LOCATION NOMUNDY OR
Tentative Series
KLM/KMS
02/2025
NOMUNDY SERIES
Landscape--Blue and Ochoco mountains
Landform--mountain slopes, low hills, complex landslides
Slope--0 to 70 percent
Parent Material--residuum and colluvium derived from extrusive volcanic rocks with an influence of volcanic ash in the surface
Mean annual precipitation--505mm
Mean annual air temperature--about 6 degrees C
Depth class--deep and very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Vertic Palexerolls
TYPICAL PEDON: Nomundy gravelly ashy loam, woodland.
Oi--0 to 5 cm; slightly decomposed fir needles, twigs and leaves
A--5 to 25 centimeters; very dark grayish brown (10YR 3/2) gravelly ashy loam, dark grayish brown (10YR 4/2) dry; moderate very fine granular, and moderate fine granular structure; soft, very friable, slightly sticky, nonplastic; many very fine roots, few medium roots and common fine roots; many very fine irregular pores and common fine irregular pores; 15 percent gravels and 5 percent cobbles; slightly alkaline (pH 7.6); gradual wavy boundary.
Bw--25 to 53 centimeters; very dark grayish brown (10YR 3/2) gravelly ashy clay loam, grayish brown (10YR 5/2) dry; moderate fine subangular blocky structure; hard, friable, moderately sticky, moderately plastic; common very fine and fine roots; common very fine tubular and few fine tubular pores; 10 percent gravels and 5 percent cobbles; slightly alkaline (pH 7.4); clear wavy boundary.
2Bt1--53 to 97 centimeters; very dark grayish brown (10YR 3/2) extremely cobbly clay, moist, grayish brown (10YR 5/2) dry; moderate medium subangular blocky structure; hard, firm, very sticky, very plastic; few very fine and fine roots; few very fine and fine tubular pores; 50 percent faint clay films on ped faces; 40 percent gravels, 20 percent cobbles, and 10 percent stones; slightly alkaline (pH 7.5); clear wavy boundary.
2Bt2--97 to 170 centimeters; dark grayish brown (10YR 4/2) extremely cobbly clay, light brownish gray (10YR 6/2) dry; moderate medium and coarse subangular blocky structure; hard, firm, very sticky, very plastic; few very fine and few fine and medium roots; few very fine and fine tubular pores; 50 percent distinct clay films on surfaces along pores and ped faces; 35 percent gravels, 20 percent cobbles, and 10 percent stones; slightly alkaline (pH 7.5)
TYPE LOCATION: Grant County, Oregon; 25 km northeast of Monument; 86 m south of road; 800 m north and 795 m east of the SW corner of sec. 11, T. 7 S., R. 29 E.; Latitude 44.9743611, Longitude -119.1936944, WGS84; coordinates determined from GPS.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 7 degrees C
Soil moisture--usually moist, dry for 60 to 90 days in summer and early fall
Mollic epipedon--50 to 100 cm thick
Depth to paralithic contact--greater than 100 cm below the mineral soil surface
Thickness of volcanic ash influenced layers--18 to 36 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.2 to 0.5 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
*Clay--35 to 60 percent
*Total fragments--35 to 75 percent
*Fragment types--andesitic tuff, rhyolite, basalt
A horizon
*Hue--10YR moist or dry
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--1 to 2 moist or dry
*Fine earth texture--ashy loam, ashy silt loam
*Clay--10 to 20 percent
*Sand--15 to 45 percent
*Organic matter--2 to 8 percent
*Total fragments--0 to 60 percent
*Gravel--0 to 30 percent
*Cobbles--0 to 40 percent
*Stones--0 to 10 percent
*Reaction--slightly acid to slightly alkaline
Bw horizon
*Hue--10YR moist or dry
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--1 to 3 moist or dry
*Fine earth texture--ashy loam, ashy clay loam
*Clay--15 to 30 percent
*Sand--30 to 50 percent
*Organic matter content--1 to 4 percent
*Total fragments--15 to 60 percent
*Gravel--10 to 30 percent
*Cobbles--5 to 30 percent
*Stones--0 to 10 percent
*Reaction--neutral to slightly alkaline
*Thickness--0 to 30 cm (Not all pedons have a Bw horizon)
2Bt horizons
*Hue--10YR to 5YR moist or dry
*Value--2 or 3 moist, 4 to 5 dry
*Chroma--2 to 4 moist or dry
*Fine earth texture--clay, clay loam
*Clay--35 to 60 percent
*Sand--15 to 40 percent
*Organic matter content--0.75 to 2 percent
*Total fragments--45 to 80 percent
*Gravel--30 to 50 percent
*Cobbles--15 to 35 percent
*Stones--0 to 20 percent
*Reaction--neutral to slightly alkaline
COMPETING SERIES:
Bigmow--dry for 45 to 60 days
Diffin--lack volcanic ash influence
Yawkey--contains coarse ash in surface with greater than 50 percent sand
GEOGRAPHIC SETTING:
Elevation--760 to 1585 m
Climate--cold, moist winters and warm, dry summers
Mean annual precipitation--355 to 760 mm
Mean annual air temperature--3 to 7 degrees C
Frost-free period--50 to 100 days
Lithology--weathered volcanic tuff generally of the Clarno Formation
GEOGRAPHICALLY ASSOCIATED SOILS:
Dupratt--occur on mountain slopes; 50 to 100 cm to lithic contact
Meaufun--occur on mountain slopes; less than 35 percent fragments in control section
Quirk--occur on benches, ridges; 50 to 100 cm to lithic contact
Sharpridge--occur on adjacent north slopes; greater than 36 cm of andic soil properties in surface; dry 45 to 60 days
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--Well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity--High in the upper ash influenced part, moderately low to low in the clayey lower part
USE AND VEGETATION:
Use--timber production, wildlife habitat, livestock grazing
Potential native vegetation--Ponderosa pine, common snowberry, elk sedge, Idaho fescue, antelope bitterbrush.
Typical plant associations--CPS524 and CPG222; Johnson, C.G and Clausnitzer, R.R; 1992; Plant Associations of the Blue and Ochoco Mountains; USDA Forest Service; R6-ERW-TP-036-92 . (Dry and moist Ponderosa Pine Plant Association Group)
DISTRIBUTION AND EXTENT: Central Oregon, Southwestern Blue Mountains, MLRA 10. The soil is of moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Grant County Area, Oregon; 2017
REMARKS:
Diagnostic horizons and other features recognized in this pedon are
*Particle size control section--25 to 75 cm
*Mollic epipedon--5 to 97 cm
*Volcanic glass--5 to 53 cm
*Argillic horizon--25 to 170 cm
*Pale feature--abrupt textural change at 53 cm with an absolute increase in clay content of 20 percent
*Vertic subgroup--the calculated LE is over 6.0 centimeters within the upper 100 cm
*Lithologic Discontinuity--53 cm
This series represents the fine ash version of the Yawkey series.
National Cooperative Soil Survey
U.S.A.