LOCATION BONNIEVIEW OR
Tentative Series
IRD. JRD/KMS
12/2024
BONNIEVIEW SERIES
Landscape--mountains and foothills of the Blue and Ochoco Mountains
Landform--mountain slopes, complex landslides, benches, hillslopes
Slope--0 to 45
Parent Material--residuum and colluvium derived from volcanic rocks
Mean annual precipitation--450mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Fine, smectitic, frigid Vertic Argixerolls
TYPICAL PEDON: Bonnieview very gravelly clay loam, rangeland/shrub steppe. (Colors are for dry soil unless otherwise noted.)
A1--0 to 8 centimeters; very dark grayish brown (10YR 3/2) very gravelly clay loam, black (10YR 2/1) moist; moderate fine and medium platy structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine vesicular pores; 35 percent gravels; slightly acid (pH 6.2); abrupt smooth boundary. (5 to 13 centimeters thick)
A2--8 to 25 centimeters; very dark grayish brown (10YR 3/2) gravelly silty clay loam, black (10YR 2/1) moist; moderate fine and medium subangular blocky structure; slighty hard, friable, slightly sticky and slightly plastic; many very fine and fine, common coarse roots; many very fine and fine tubular pores; 25 percent gravels; slightly acid (pH 6.2); abrupt wavy boundary. (15 to 20 centimeters thick)
Bt--25 to 56 centimeters; dark brown (10YR 3/3) clay, very dark brown (10YR 2/2) moist; weak medium and coarse prismatic structure parting to strong fine and moderate angular blocky structure; very hard, very firm, very sticky and very plastic; common very fine and fine roots; few very fine tubular pores; continuous thick clay films on faces of peds and lining pores; 5 percent gravels and 3 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (25 to 36 centimeters thick)
Btk1--56 to 69 centimeters; dark yellowish brown (10YR 3/4) stony clay, dark brown (10YR 3/3) moist; strong fine and medium angular blocky structure; very hard, very firm, very sticky and very plastic; common very fine and fine roots; few very fine tubular pores; many moderately thick clay films on ped faces and lining pores; discontiuous white, violently effervescent, calcareous coatings, 1 to 2 mm thick, on sides/bottoms of gravels, cobbles and stones; 5 percent gravels, 5 percent cobbles and 5 percent stones; neutral (pH 7.0); abrubt wavy boundary. (10 to 15 centimeters thick)
Btk2--69 to 200 centimeters; yellowish brown (10YR 5/4) cobbly clay, dark yellowish brown (10YR 3/4) moist; moderate fine and medium angular blocky structure; hard, friable, very sticky and very plastic; few very fine and fine roots; common very fine and fine tubular pores; many moderately thick clay films on ped faces and lining pores; discontiuous white, violently effervescent, calcareous coatings, 1 to 2 mm thick, on sides/bottoms of gravels, cobbles and stones; 5 percent gravels, 10 percent cobbles and 5 percent stones; neutral (pH 7.2).
TYPE LOCATION: Crook County, Oregon; SW1/4, NW1/4 NW 1/4 of section 21, T. 17 S., R 20 E.; Latitude 44.084992, Longitude -120.344961, WGS84; coordinates determined from GPS
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 8 degrees C
Mean summer soil temperature-6.7 to 7.2degrees C
Mean winter soil temperature--0 to 2.2 degrees C
Soil moisture--normally moist but dry 75 to 90 consecutive days in summer and early fall
Thickness of the mollic epipedon--55 to 80 cm thick
Thickness of the argillic horizon--100 to 175 cm thick
Linear extensibilty--greater than 6.0 cm in the upper 100 cm
Particle-size Control Section--upper 50 centimeters of argillic horizon
*Clay content (weighted average)--35 to 65 percent
*Total fragments (weighted average)--15 to 20 percent
A horizons
*Value--2 or 3 moist, 3 or 4 dry
*Chroma--1 to 3 moist, 2 or 3 dry
*Fine earth texture--silty clay loam, clay loam, or sandy clay loam
*Clay--27 to 40 percent
*Sand--15 to 50 percent
*Organic matter--2 to 4 percent
*Total fragments--5 to 60 percent
*Gravel--15 to 45 percent
*Cobbles--0 to 20 percent
*Stones--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 6.5)
Bt and Btk horizons
*Value--2 to 4 moist, 3 or 4 dry
*Chroma--2 to 4 moist, 2 or 3 dry
*Fine earth texture--sandy clay, silty clay, or clay
*Clay--35 to 65 percent
*Sand--10 to 50
*Organic matter--1 to 3 percent in upper Bt horizons, 0 to 1 percent in lower Btk horizons
*Total fragments--5 to 35 percent
*Gravel--0 to 35 percent
*Cobbles--0 to 15 percent
*Stone content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 6.5)
Other features - in the Btk horizons there are discontinuous white calcareous coatings on sides/bottoms of pebbles, cobbles and stones. This coating ranges from 1 to 2 mm thick and are violently effervescent
COMPETING SERIES:
Cleymor--have organic surface horizons, surface horizons contain less than 50 percent sand
Laplatta--dry for 30 to 40 days after summer solstice
Mondey--thickness of mollic epipedon does not exceed 50 cm, formed in materials weathered from sandstone
Noodler--redox concentrations occur below 50 cm
Streek-- thickness of mollic epipedon does not exceed 50 cm
Top--have organic surface horizons, dry for 45 to 60 days after summer solstice
Wickiser--contain enough ash in the surface to meet vitrandic criteria
GEOGRAPHIC SETTING:
Elevation--1,200 to 1,830 meters
Climate--cold, wet winters and hot, dry summers
Mean annual precipitation--305 to 535 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--40 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ateron--occur on hillslopes, mountain slopes, ridges, benches; 25 to 50 cm to lithic contact
Luckycreek--occur on drainageways, swales, hillslopes, average 25 to 35 percent clay in the particle size control section, contain enough ash to meet vitrandic criteria
Observation--occur on hillslopes, mountain slopes, benches, 50 to 100 cm to lithic contact
DRAINAGE AND PERMEABILITY:
Drainage - well drained
Saturation during normal years--none
Flooding--none
Ponding--none to occasional
Saturated hydraulic conductivity--moderately high in A horizons and moderately low in B horizons
USE AND VEGETATION:
Use--livestock grazing and wildland habitat.
Vegetation--mountain big sagebrush, idaho fescue, bluebunch wheatgrass, bluegrass, lupine and scattered western juniper. Blue Mtn Plant Association - SD29-11, Hall, Fred.; 1973; Plant Communities of the Blue Mountains in Eastern Oregon and Southwestern Washington; USDA PNW, R6 - Area Guide 3-1.
DISTRIBUTION AND EXTENT: Central Oregon, MLRA 10 and 43c. This series is of moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Crook County, Oregon. 2006.
REMARKS: Diagnostic horizons and features in this pedon are:
Mollic epipedon - The zone from the surface to 69 centimeters (A1 and A2, Bt, Btk1 horizons)
Argillic horizon - The zone from 25 centimeters to 200 centimeters. (Bt, Btk1, 2Btk2)
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National Cooperative Soil Survey
U.S.A.