LOCATION JENIPED OR
Tentative Series
KLM/MPR
02/2025
JENIPED SERIES
Landscape--plateaus
Landform--fan remnants or pediments
Slope--0 to 20 percent
Parent Material--colluvium and residuum derived from fanglomerate with an influence of volcanic ash in the surface
Mean annual precipitation--about 280 mm
Mean annual air temperature--about 9 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric
TAXONOMIC CLASS: Fine, smectitic, mesic Vitritorrandic Argixerolls
TYPICAL PEDON: Jeniped ashy loam, rangeland, on a 5 percent slope at an elevation of 1190 m (When described on August 13, 2015, the soil was slightly moist throughout.)
A--0 to 7 centimeters; grayish brown (10YR 5/2) ashy loam, very dark grayish brown (10YR 3/2) moist; 50 percent sand; 22 percent clay; weak fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; very fine roots throughout; very fine dendritic tubular and very fine interstitial pores; 2 percent basalt gravels; moderately alkaline (pH 7.9); clear smooth boundary (3 to 15 cm thick)
AB--7 to 20 centimeters; dark grayish brown (10YR 4/2) ashy clay loam, very dark grayish brown (10YR 3/2) moist; 45 percent sand; 28 percent clay; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, moderately plastic; common fine and medium roots throughout; common very fine dendritic tubular pores; 5 percent basalt gravels; slightly alkaline (pH 7.7); clear smooth boundary (0 to 20 cm thick)
2Bt1--20 to 32 centimeters; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; 35 percent sand; 40 percent clay; moderate medium subangular blocky structure; moderately hard, firm, moderately sticky, very plastic; common fine and medium roots throughout; common very fine and fine dendritic tubular pores; 10 percent subrounded basalt gravels; slightly alkaline (pH 7.7); clear smooth boundary (10 to 25 cm thick)
2Bt2--32 to 60 centimeters; gravelly clay; dark yellowish brown (10YR 3/4), dark yellowish brown (10YR 3/4) moist; 30 percent sand; 45 percent clay; strong medium subangular blocky structure; hard, very firm, moderately sticky, very plastic; few very fine roots throughout; few fine dendritic tubular pores; 5 percent subrounded basalt cobbles and 12 percent rounded basalt gravels; slightly alkaline (pH 7.8); clear wavy boundary (5 to 30 cm thick)
2Cd--60 to 85 centimeters; densic, fanglomerate bedrock
TYPE LOCATION: Crook County, Oregon, about 12 km northwest of the town of Paulina; about 780 m west and 740 m north of the SE corner of section 16, T. 16 S., R. 22 E.
Latitude-- 44.1838770
Longitude-- -120.0942270
Datum--WGS84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 11 degrees C
Soil moisture-- Usually dry in all parts for one-half to three-fourths of the time when the soil temperature is above 5 degrees Celsius.
Depth to densic bedrock--50 to 100 cm
Mollic epipedon--15 to 40 cm thick
Argillic horizon--20 to 60 cm thick
Particle size control section:
Clay content--35 to 50 percent
Total rock fragment content--5 to 35 percent
Rock fragment type--rounded and subrounded basalt
Volcanic ash surface:
15 to 35 cm thick
Volcanic glass content--20 to 40 percent
Ammonium oxalate Al plus Fe--0.4 to 1.0 percent
A horizon
Hue--10YR dry or moist
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Fine earth texture--ashy sandy loam, ashy loam
Clay content--15 to 25 percent
Sand content--40 to 65 percent
Total rock fragments--0 to 15 percent
Gravel--0 to 15 percent
Cobbles--0 to 10 percent
Reaction--slightly alkaline to moderately alkaline
AB horizon
Hue--10YR dry or moist
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Fine earth texture--ashy loam, ashy clay loam
Clay content--15 to 35 percent
Sand content--30 to 45 percent
Total rock fragments--0 to 20 percent
Gravel--0 to 20 percent
Cobbles--0 to 10 percent
Reaction--slightly alkaline to moderately alkaline
2Bt horizons
Hue-- 7.5YR or 10YR dry or moist
Value--3 or 4 dry or moist
Chroma--2 to 4 dry or moist
Fine earth texture-- clay loam, or clay
Clay content--35 to 50 percent
Sand content--20 to 40 percent
Total rock fragments--5 to 35 percent
Gravel--0 to 30 percent
Cobbles--0 to 20 percent
Reaction--slightly alkaline
COMPETING SERIES:
There are no competing series
GEOGRAPHIC SETTING:
Elevation--1000 to 1280 m
Climate--cool, moist winters and hot, dry summers
Mean annual precipitation--230 to 300 mm
Mean annual air temperature 8 to 10 degrees C
Frost-free period--80 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ruckles--occur on upland slopes and benches; less than 100 cm to lithic contact
Polly--occur on toeslopes and swales; greater than 150 cm to restrictive feature
Lamonta--occur on adjacent toeslopes and fan remnants; less than 100 cm to duripan
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--well drained
Saturated hydraulic conductivity (Ksat)--moderately low
USE AND VEGETATION:
Use--livestock grazing, wildlife habitat
Vegetation--bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, Wyoming big sagebrush, low sagebrush
DISTRIBUTION AND EXTENT:
Central Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Crook County, Oregon 2/2017; The name is coined
REMARKS:
Diagnostic horizons and features in this pedon are:
Particle size control section--7 to 57 cm
Volcanic Glass--0 to 20 cm
Mollic epipedon--0 to 32 cm
Argillic horizon--7 to 60 cm
Densic contact--60 cm
National Cooperative Soil Survey
U.S.A.