LOCATION BUNDO NM+CO MT

Established Series
RD: GWA/BDS/KLS
07/2022

BUNDO SERIES

The Bundo series consists of deep that have moderately rapid permeability and formed in colluvium and alluvium derived from acid intrusive igneous rocks on mountain slopes. Slopes range from 25 to 60 percent. Mean annual precipitation is 560 mm, and the mean annual air temperature is 3 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Palecryalfs

TYPICAL PEDON: Bundo gravelly sandy loam - forested. (Colors are for dry soils unless otherwise noted.)

Oi--0 to 8 cm; forest litter. (3 to 10 cm thick)

E1--8 to 36 cm; light gray (10YR 7/2) gravelly sandy loam, brown (10YR 5/3) moist; moderate very fine granular structure; soft, very friable; many fine and coarse roots; common fine pores; 15 percent pebbles; moderately acid; gradual smooth boundary. (20 to 38 cm thick)

E2--36 to 69 cm; light gray (10YR 7/2) gravelly sandy loam, pale brown (10YR 6/3) moist; strong very fine granular structure; slightly hard, friable; few medium and coarse roots; common fine pores; 35 percent pebbles; strongly acid; gradual smooth boundary. (25 to 64 cm thick)

EB--69 to 84 cm; (E2) light gray (10YR 7/2) very gravelly sandy loam, pale brown (10YR 6/3) moist; moderate fine granular structure; slightly hard, friable; (Bt) lamellae of light yellowish brown (10YR 6/4) gravelly loam, yellowish brown (10YR 5/4) moist; moderate fine subangular blocky structure; hard, firm, slightly sticky, slightly plastic; lamellae 6 to 25 mm thick; few medium and coarse roots; 45 percent pebbles; strongly acid; gradual wavy boundary. (10 to 20 cm thick)

BE--84 to 150 cm; (Bt) light yellowish brown (10YR 6/4) very gravelly loam, dark yellowish brown (10YR 4/4) moist strong fine subangular blocky structure; hard, firm, slightly sticky, plastic; (E) very pale brown (10YR 7/3) gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine granular structure; slightly hard, friable; (E) material occurs in pockets and cracks and as coatings on coarse fragments; 45 percent pebbles; moderately acid; gradual smooth boundary. (50 to 70 cm thick)

Bt1--150 to 186 cm; light yellowish brown (10YR 6/4) very gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; common fine distinct mottles of brown (7.5YR 4/2), dark brown (7.5YR 3/2) moist; moderate and strong fine subangular blocky structure; hard, firm, sticky, plastic; common, moderately thick clay films on faces of peds and bridging some coarse particles; about 5 percent by volume of E material is on top of coarse fragments; 50 percent pebbles; moderately acid; gradual smooth boundary. (30 to 46 cm thick)

Bt2--186 to 247 cm; light yellowish brown (10YR 6/4) extremely gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; common fine distinct mottles of brown (7.5YR 4/2), dark brown (7.5YR 3/2) moist; massive; hard, firm, sticky, plastic; common, moderately thick clay films on and bridging coarse fragments; some coarse fragments have very gravelly loam E material on them; 80 percent pebbles; moderately acid.

TYPE LOCATION: Colfax County, New Mexico; about 4 km northeast of Eagle Nest, New Mexico; 2 km northeast of the northeast end of the Eagle Nest airstrip in line with the airstrip. Unsectionized area.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 degrees C
Mean summer soil temperature--9 degrees C
Depth to argillic horizon--115 to 178 cm
Total rock fragments--15 to 50 percent at surface, 35 to 85 percent in the control section

E horizon
Hue--7.5YR or 10YR
Value--6 through 8 dry, 4 through 6 moist
Chroma--2 through 4, dry or moist
Texture--loam or sandy loam

Bt horizon
Hue--7.5YR or 10YR
Value--5 or 6 dry or 3 through 5 moist
Chroma--2 through 6 dry or moist
Texture--sandy clay loam or loam
Clay content--10 to 25 percent clay
Sand content--50 percent or more

COMPETING SERIES: These are the Etoe, Horsethief and Marosa series. Etoe soils have an argillic horizon with its upper boundary between 60 and 100 cm from the surface. Horsethief soils have less than 50 percent sand in the argillic horizon. Marosa soils have 25 percent or more clay in the control section.

GEOGRAPHIC SETTING:
Landform--steep and very steep, stony and gravelly, convex mountain slopes
Elevation--2,445 to 3,500 meters
Slope--25 to 60 percent
Parent material--medium textured, gravelly colluvial-alluvial material derived from acid intrusive igneous rocks
Mean annual precipitation--460 to 640 mm
Mean annual air temperature--3 degrees C
Mean summer air temperature--8 degrees C

GEOGRAPHICALLY ASSOCIATED SOILS: None listed

DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately rapid permeability

USE AND VEGETATION: Wildlife, recreation, and timber production. Douglas-fir, Engelman spruce, white fir, and limber pine. Understory is kinnikinnick, Oregon grape, mock orange, and some mountain grasses.

DISTRIBUTION AND EXTENT: Bundo soils are moderately extensive in northern New Mexico, southern Colorado, and western Montana; MLRAs 43B, 48A, 49

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

SERIES ESTABLISHED: Colfax County, New Mexico, 1974.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Argillic horizon--150 to 247 cm (Bt horizons)

Pale feature--argillic horizon with upper boundary deeper than 150 cm below surface

Particle-size control section--150 to 200 cm

Converted to metric and O horizons were updated to start at zero; 3/2022

ADDITIONAL DATA: Lincoln Lab S66NMex-4-3 (66L593-597).

National Cooperative Soil Survey
U.S.A.