LOCATION PYRENEES                ID

Established Series
Rev. RWW/ RGK/CBR
05/2018

PYRENEES SERIES

Landscape--lava fields
Landform--lava flows
Slope--0 to 12 percent
Parent material--alluvium derived from basalt
Mean annual precipitation--about 400 mm
Mean annual air temperature--about 4.4 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Calcixerolls

TYPICAL PEDON: Pyrenees extremely cobbly loam in an area of rangeland (Colors are for dry soil unless otherwise noted.)

A1--0 to 8 cm; grayish brown (10YR 5/2) extremely cobbly loam, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine and common medium and coarse roots; many very fine tubular pores; 25 percent gravel, 40 percent cobbles, and 10 percent stones; neutral (pH 7.2); clear wavy boundary

A2--8 to 18 cm; grayish brown (10YR 5/2) extremely cobbly loam, dark brown (10YR 3/3) moist; strong fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine and common medium and coarse roots; many very fine tubular pores; finely disseminated calcium carbonate; slightly effervescent; 30 percent gravel, 40 percent cobbles, and 10 percent stones; slightly alkaline (pH 7.4); gradual wavy boundary

Bk1--18 to 30 cm; pale brown (10YR 6/3) extremely cobbly loam, brown (10YR 5/3) moist; common medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine tubular pores; calcium carbonate coatings on rock fragments; 30 percent gravel, 40 percent cobbles, and 10 percent stones; violently effervescent; slightly alkaline (pH 7.7); gradual wavy boundary

Bk2--30 to 53 cm; very pale brown (10YR 7/3) extremely cobbly loam, pale brown (10YR 6/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine irregular pores; calcium carbonate coats on rock fragments; 40 percent gravel, 35 percent cobbles and 5 percent stones; violently effervescent; moderately alkaline (pH 7.9); abrupt irregular boundary

R--53 cm; basalt

TYPE LOCATION: Clark County, Idaho; latitude 44.24333 degrees north, longitude 112.17167 degrees west, datum WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.9 to 7.2 degrees C
Depth to lithic contact--50 to 100 cm
Thickness of mollic epipedon--18 to 25 cm
Depth to calcic horizon--18 to 25 cm

Particle-size control section (weighted averages)
Clay content--10 to 18 percent
Total rock fragment content--65 to 85 percent

A horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--10 to 18 percent
Total rock fragment content--60 to 80 percent
Gravel content--20 to 30 percent
Cobble content--35 to 40 percent
Stone content--5 to 10 percent
Reaction--pH 6.6 to 7.6
Thickness--13 to 28 cm

Bk horizon
Value--5 to 8 dry, 3 to 7 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loam, sandy loam
Clay content--10 to 18 percent
Total rock fragment content--65 to 85 percent
Gravel content--30 to 45 percent
Cobble content--30 to 40 percent
Stone content--5 to 10 percent
Calcium carbonate equivalent--15 to 25 percent
Reaction--pH 7.9 to 8.2
Thickness--23 to 76 cm

COMPETING SERIES:
Bezzant, Cedarhill, Dennot, Georgecanyon--very deep to lithic contact
Eaglecone--deep to lithic contact
Ricafied--more than 18 percent clay in particle-size control section

GEOGRAPHIC SETTING:
Elevation--1610 to 1860 m
Mean annual precipitation--300 to 525 mm
Mean annual air temperature--2.2 to 6.1 degrees C
Frost-free period--70 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS: None listed

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 25 um/sec

USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--Wyoming sagebrush, threetip sagebrush, bluebunch wheatgrass, Sandberg bluegrass, tapertip hawksbeard, horsebrush, rabbitbrush, buckwheat

DISTRIBUTION AND EXTENT: Small extent in eastern Idaho; MLRA 11

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Clark County, Idaho; 2018

REMARKS:
Diagnostic horizons and other features recognized in this pedon
Mollic epipedon--zone from the surface to a depth of 18 cm (A1 and A2 horizons)
Calcic horizon--zone from 18 to 53 cm (Bk1 and Bk2 horizons)
Depth to lithic contact--53 cm
Particle-size control section--zone from 25 to 53 cm (part of Bk1 horizon, Bk2 horizon)

Taxonomic version--Twelfth Edition, 2014

---

National Cooperative Soil Survey
U.S.A.