LOCATION REGRACIC NMEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Aridic Paleustalfs
TYPICAL PEDON: Regracic gravelly sandy clay loam--in rangeland on a 4 percent east facing slope at an elevation of 7,520 feet. (Colors are for dry soils unless otherwise noted.)
A--0 to 2 inches; brown (7.5YR 5/4) gravelly sandy clay loam, dark brown (7.5YR 3/3) moist; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; few fine vesicular pores; 30 percent siliceous gravel and 1 percent cobbles; neutral (pH 7.2); abrupt smooth boundary. (1 to 3 inches thick)
Bt--2 to 19 inches; reddish brown (2.5YR 4/3) clay, dark reddish brown (2.5YR 3/4) moist; strong fine and medium subangular blocky structure; very hard, very firm, very sticky and very plastic; common very fine and fine roots; common fine tubular pores; many prominent clay films coating faces of peds; 2 percent siliceous gravel; slightly alkaline (pH 7.6); abrupt smooth boundary. (9 to 24 inches thick)
Btk1--19 to 31 inches; reddish brown (2.5YR 4/3) clay loam, dark reddish brown (2.5YR 3/4) moist; moderate medium prismatic structure; very hard, very firm, sticky and plastic; common very fine and fine roots; common fine tubular pores; common distinct clay films coating faces of peds; carbonates are disseminated and segregated as many very fine and fine masses and filaments; strongly effervescent (8 percent calcium carbonate equivalent); 2 percent siliceous gravel; moderately alkaline (pH 8.2); clear smooth boundary.
2Btk1--31 to 45 inches; reddish brown (2.5YR 4/3) very gravelly sandy clay, dark reddish brown (2.5YR 3/4) moist; weak very fine and fine subangular blocky structure; hard, friable, sticky and plastic; few very fine and fine roots; few fine irregular pores; common distinct clay films coating faces of peds and bridging sand grains; common fine calcium carbonate concretions; carbonates are disseminated and segregated as many very fine and fine masses and filaments, and coating rock fragments; violently effervescent (22 percent calcium carbonate equivalent); 55 percent siliceous gravel; moderately alkaline (pH 8.0); abrupt smooth boundary.
2Btk2--45 to 50 inches; yellowish red (5YR 5/6) clay loam, yellowish red (5YR 4/6) moist; weak very fine and fine subangular blocky structure; hard, firm, slightly sticky and slight plastic; few very fine and fine roots; common fine irregular pores; common distinct clay films coating faces of peds and bridging sand grains; few fine calcium carbonate concretions; carbonates are disseminated and segregated as many very fine and fine masses and filaments, and coating rock fragments; strongly effervescent (8 percent calcium carbonate equivalent); 5 percent siliceous gravel; moderately alkaline (pH 8.2); abrupt smooth boundary.
2Btk3--50 to 56 inches; yellowish red (5YR 5/6) very gravelly sandy clay loam, yellowish red (5YR 4/6) moist; weak very fine and fine subangular blocky structure parting to weak very fine granular; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few medium irregular pores; few faint clay films bridging sand grains and coating rock fragments; carbonates are disseminated and segregated as few fine masses and filaments; slightly effervescent (3 percent calcium carbonate equivalent); 55 percent siliceous gravel; slightly alkaline (pH 7.8); abrupt smooth boundary.
2Btk4--56 to 60 inches; reddish brown (2.5YR 5/4) clay loam, dark reddish brown (2.5YR 3/4) moist; moderate fine subangular blocky structure; hard, firm, slightly sticky and slight plastic; few very fine and fine roots; common fine irregular pores; common faint clay films coating faces of peds and bridging sand grains; few fine calcium carbonate concretions; carbonates are disseminated and segregated as common fine masses and filaments; strongly effervescent (6 percent calcium carbonate equivalent); 5 percent siliceous gravel; slightly alkaline (pH 7.8); abrupt smooth boundary. (The combined thickness of the Btk horizons is 24 to 67 inches.)
3BCk--60 to 80 inches; reddish brown (5YR 4/4) gravelly sandy loam, dark reddish brown (5YR 3/4) moist; weak very fine and fine granular structure; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine roots; common medium pores; carbonates are disseminated and segregated as few very fine and fine masses; slightly effervescent (3 percent calcium carbonate equivalent); 25 percent siliceous gravel; slightly alkaline (pH 7.8). (0 to 30 inches thick)
TYPE LOCATION: McKinley County, New Mexico; Pine Canyon Quadrangle; about 2.6 miles northwest of the Ford ranch headquarters; 108 degrees 13 minutes 46 seconds west longitude, 35 degrees 20 minutes 36 seconds north latitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: The SMCS is usually moist, in all parts, for less than 90 cumulative days from April through October. It is usually dry, in some part, for more than 120 cumulative days during the same period. It is continuously moist in some part November through March. The period of maximum precipitation is July through October. The soil is driest during May and June. Aridic ustic moisture regime.
Soil Temperature: 49 to 55 degrees F
Particle size control section: 35 to 55 percent clay and greater than 30 percent sand
Depth to secondary carbonates: 12 to 26 inches
Depth to calcic horizon: 15 to 35 inches and 6 to 37 inches thick with 15 to 40 percent calcium carbonate equivalent
A horizon
Hue: 5YR or 7.5YR
Value: 4 or 5 dry
Chroma: 3 or 4
Rock fragments: 10 to 40 percent total; 10 to 40 percent gravel; 0 to 1 percent cobbles. Fragments are mostly siliceous gravel and cobbles and petrified wood.
Reaction: neutral or slightly alkaline
Bt horizon
Hue: 2.5YR, 5YR, or 7.5YR
Chroma: 3 or 4 dry
Texture: clay or sandy clay
Rock fragments: 0 to 5 percent gravel
Reaction: neutral or slightly alkaline
Btk horizon
Hue: 2.5YR, 5YR, or 7.5YR
Value: 4 to 7 dry, 3 to 6 moist
Chroma: 3 to 6
Texture: clay loam, clay, sandy clay, or sandy clay loam
Rock fragments: 0 to 60 percent gravel
Reaction: slightly or moderately alkaline
Percent calcium carbonate equivalent: 3 to 40 percent with the calcic horizon ranging from 15 to 40 percent
BCk horizon (when present)
Hue: 2.5YR, 5YR, or 7.5YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 or 4
Texture: sandy loam or fine sandy loam
Rock fragments: 5 to 30 percent gravel and 0 to 1 percent cobbles
Percent calcium carbonate equivalent: less than 10 percent
COMPETING SERIES: These are the Bryway (NM), Galestina (NM) and Galzuni (NM) series. Bryway soils are moderately deep. Galestina soils are deep. Galzuni soils lack calcic horizons.
GEOGRAPHIC SETTING: The Regracic soils formed in alluvium and stream alluvium from sandstone, shale, and conglomerate (Chinle and Supai formations) and are on relict stream terraces on valley floors. Slopes are 2 to 6 percent. Elevations range from 7400 to 7700 feet. The mean annual temperature is 47 to 53 degrees F., and the mean annual precipitation is 13 to 16 inches. The frost free period is 100 to 135 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fickle and Venzuni series on valley sides and floors; and the Tuces soils on escarpments. These soils do not have calcic horizons. In addition, the Fickle and Venzuni soils have vertic properties.
DRAINAGE AND PERMEABILITY: Well drained, medium to high runoff, and slow permeability.
USE AND VEGETATION: This series is used for livestock grazing and wood products. The present vegetation is pinyon and oneseed juniper, rabbitbrush, horsebrush, fringed sage, blue grama and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: West central New Mexico. MLRA 35, LRR-D. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: McKinley County Area, New Mexico; McKinley County and Parts of Cibola and San Juan Counties, 2001.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 2 inches. (A horizon)
Argillic horizon: The zone from 2 to 60 inches. (Bt, Btk1, 2Btk1 2Btk2, 2Btk3 and 2Btk4 horizons)
Calcic horizon: The zone from 31 to 45 inches. (2Btk1 horizon)
Pale feature: The abrupt textural change from the A to the Bt horizon.
Classified according to Soil Taxonomy Second Edition, 1999.