LOCATION PAVO NMEstablished Series
TAXONOMIC CLASS: Ashy, glassy Ustic Palecryolls
TYPICAL PEDON: Pavo loam--mountain grasslands. (Colors are for dry soil unless otherwise stated.)
A1--0 to 9 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; soft, very friable, slightly sticky and slightly plastic; common fine and very fine roots; slightly acid; clear wavy boundary. (7 to 12 inches thick)
A2--9 to 12 inches; brownish gray (10YR 5/2) sandy loam, very dark grayish brown (10YR 3/2) moist; weak coarse subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots; 5 percent cobbles and 5 percent pebbles; neutral; clear wavy boundary. (3 to 8 inches thick)
E--12 to 25 inches; very pale brown (10YR 7/3) sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine roots; 14 percent pebbles; neutral; clear wavy boundary. (10 to 15 inches thick)
E/Bt1--25 to 35 inches; matrix is very pale brown (10YR 7/3) sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; (lamellae are .4 to .7 inch thick and total 1.5 inches; brown (7.5YR 5/4) sandy clay loam, dark brown (7.5YR 4/4) moist; slightly hard, friable, slightly sticky and slightly plastic; clay films on sand grains and clay bridges between grains in lamellae;) 5 percent pebbles; neutral (pH 7.0); clear wavy boundary. (12 to 18 inches thick)
E/Bt2--35 to 45 inches; matrix is very pale brown (10YR 7/3) fine sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; (lamellae are .5 inch thick and total about 5 inches yellowish brown (10YR 5/4) sandy clay loam, brown (10YR 4/3) moist; hard, friable, slightly sticky and slightly plastic; clay films on sand grains and clay bridges between grains in lamellae;) 5 percent pebbles; neutral (pH 6.8); clear smooth boundary. (8 to 12 inches thick)
2Bt1--45 to 50 inches; brown (7.5YR 5/4) gravelly clay loam, dark brown (7.5YR 4/4) moist; weak fine subangular blocky structure; hard, friable, sticky and plastic; thick continuous clay films on coarse fragments; 30 percent pebbles; slightly acid (pH 6.5); clear smooth boundary. (4 to 8 inches thick)
3Bt2--50 to 60 inches; very pale brown (10YR 7/4) cobbly sandy loam, dark yellowish brown (10YR 4/4) moist; weak coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; clay films on sand grains and clay bridges between grains; 10 percent cobbles and 5 percent pebbles; neutral (pH 6.6).
TYPE LOCATION: Sandoval County, New Mexico; Baca Location Number 1; about 1 mile south of Tom's Cabin in San Antonio Valley; about 60 feet west of the road; New Mexico state plane coordinates N. 1,806,419 feet and E. 407,150 feet.
RANGE IN CHARACTERISTICS: Depth to argillic: greater than 24 inches
Percent clay in the particle-size control section: 18 to 35 percent weighted average
Percent rock fragment in control section: 0 to 35 percent (mostly pebbles)
Reaction: slightly acid to neutral
Argillic horizon: composed mainly of lamellae thicker than 1 cm.
A horizon - Value: 4 or 5 dry, 2 or 3 moist Chroma: 2 or 3 Texture: loam or sandy loam
E horizon - Hue: 7.5YR or 10YR Value: 5 through 7 dry, 4 or 5 moist Chroma: 3 or 4 Texture: sandy loam or fine sandy loam
Bt horizon (lamellae) - Hue: 5YR through 10YR Value: 5 or 6 dry, 4 or 5 moist Chroma: 3 or 4 Texture (lamellae): sandy loam or sandy clay loam
2 and 3Bt horizons - Hue: 5YR through 10YR Value: 5 through 7 dry, 4 or 5 moist Chroma: 3 or 4 Texture: clay loam, sandy clay loam, or sandy loam
COMPETING SERIES: These are the Alpon, Ercan, Pintlar soils. Alpon soils have an E horizon 25 to 40 inches thick. Ercan and Pintlar soils lack lamellae.
GEOGRAPHIC SETTING: Pavo soils are on mountainside toeslopes with slopes of 5 to 20 percent. Elevations are 8,500 to 10,000 feet. These soils are formed in materials derived from tuff and pumice. The climate is continental, and mean annual precipitation is about 25 to 30 inches. The mean annual temperature is about 39 to 42 degrees F., and the frost-free period is 45 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Origo (T) and Palon (T) series.
These soils have more than 35 percent rock fragments in the control section and lack a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Pavo soils are used for grazing. The native vegetation is Arizona fescue, bluegrass spp., mountain muhly, prairie junegrass, and carex spp.
DISTRIBUTION AND EXTENT: The soil occurs in northcentral New Mexico. Series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Sandoval County, New Mexico, 1979.
REMARKS: DIAGNOSTIC HORIZONS AND FEATURES RECOGNIZED IN THIS PEDON ARE:
Mollic epipedon: The zone from 0 to 12 inches. (A horizons)
Albic horizon: The zone from 12 to 25 inches. (E horizon)
Argillic horizon: Composed of lamellae at least 1 cm thick with a combined thickness of over 15 cm in the E/Bt1 and E/Bt2 horizons.