LOCATION TRAZUNI NMTentative Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Trazuni loamy fine sand--in a ponderosa pine woodland on a 1 percent east-southeast facing slopes at an elevation of 7,150 feet. (Colors are for dry soils unless otherwise noted.)
A--0 to 2 inches; brown (10YR 5/3) loamy fine sand, dark brown (7.5YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; few medium, common fine and many very fine roots; common very fine irregular pores; slightly acid (pH 6.2); abrupt smooth boundary. (2 to 4 inches thick)
Bw--2 to 12 inches; brown (7.5YR 4/2) fine sandy loam, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few medium common fine and many very fine roots; common very fine irregular pores; few clay stains on sand grains; slightly acid (pH 6.4); clear smooth boundary. (5 to 13 inches thick)
Bt1--12 to 19 inches; brown (7.5YR 5/4) fine sandy loam, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few coarse and common medium, fine and very fine roots; common very fine irregular pores; few faint clay films bridging sand grains; slightly acid (pH 6.4); clear smooth boundary. (The combined thickness of the Bt horizons is 19 to 36 inches.)
Bt2--19 to 32 inches; strong brown (7.5YR 5/6) sandy clay loam, brown (7.5YR 4/4) moist; moderate coarse subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common medium, fine and very fine roots; common very fine irregular pores; common distinct clay films bridging sand grains; neutral (pH 6.6); clear smooth boundary. (The combined thickness of the Bt horizons is 19 to 36 inches.)
Bt3--32 to 39 inches; strong brown (7.5YR 5/6) sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; few medium and fine and common very fine roots; common very fine irregular pores; few distinct clay films bridging sand grains; neutral (pH 6.8); clear smooth boundary. (The combined thickness of the Bt horizons is 19 to 36 inches.)
C1--39 to 47 inches; strong brown (7.5YR 5/6) sandy clay loam, brown (7.5YR 4/4) moist; massive; slightly hard, friable, slightly sticky and nonplastic; few very fine roots; common very fine irregular pores; neutral (pH 6.8) clear smooth boundary. (The combined thickness of the C horizons is 20 to 31 inches.)
C2--47 to 65 inches; reddish yellow (7.5YR 6/6) very fine sandy loam, strong brown (7.5YR 4/6) moist; common, fine, faint, strong brown (7.5YR 5/8) mottles; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; few very fine irregular pores; neutral (pH 7.2). (The combined thickness of the C horizons is 20 to 31 inches.)
TYPE LOCATION: McKinley County, New Mexico; Plumasano Basin Quadrangle; about 2.25 miles southeast of Mullen Canyon on the Zuni Indian Reservation; 108 degrees 45 minutes 36 seconds west longitude, 34 degrees 55 minutes 57 seconds north latitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: The SMCS is usually moist, in some part, for more than 90 cumulative days from May through October. It is usually dry, in all parts, for less than 90 cumulative days during the same period. It is continuously moist in some part November through April. The period of maximum precipitation is July through October. The soil is driest during May and June. Typic ustic moisture regime.
Soil Temperature: 42 to 47 degrees F
Particle-size control section: 18 to 30 percent clay and greater than 45 percent sand
Mollic epipedon thickness: 7 to 13 inches
Depth to mottles: 35 to 50 inches to mostly 7.5YR strong brown and reddish yellow mottles. Some pedons may also have few 2.5Y and 5Y olive colored mottles. All mottles have a chroma of 3 or more.
A horizon:
Hue: 7.5YR or 10YR
Value dry: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3
Bw horizon:
Hue: 7.5YR or 10YR
Value dry: 4 or 5 dry, 3 or 4 moist
Chroma: 2 to 4
Texture: fine sandy loam or loamy fine sand
Reaction: slightly acid or neutral
Bt horizons:
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 3 to 5 moist
Chroma: 4 to 6 dry, 2 to 6 moist
Texture: fine sandy loam or sandy clay loam
Reaction: slightly acid or neutral
C horizon:
Value: 4 to 6 dry, 4 or 5 moist
Chroma: 4 to 6
Texture: sandy clay loam or very fine sandy loam
COMPETING SERIES: These are the
Absarook (MT),
Archmesa (CO),
Beartooth (MT),
Beeno (WY),
Bielenberg (T MT),
Bookcliff (UT),
Burtoner (MT),
Clancy (MT),
Clasoil (MT),
Dooley (MT),
Doughty (MT),
Empedrado (CO),
Fairfield (MT),
Farnuf (MT),
Farside (MT),
Felor (SD),
Greenway (SD),
Gurney (SD),
Hangdo (UT),
High (CO),
Hoppers (MT),
Hyalite (MT),
Jeffcity (MT),
Kokoruda (MT),
Livona (ND),
Martinsdale (MT),
Maudlin (CO),
Meagher (MT),
Moen (CO),
Moento (CO),
Pianohill (MT),
Placerton (MT),
Reeder (ND),
Reedwest (MT),
Sipple (MT),
Snakejohn (UT),
Sponseller (AZ),
Trag (CO),
Tragmon (CO),
Trujillo (CO),
Ulrant (WY),
Vida (MT),
Watne (MT),
Watrous (ND),
Williams (ND), and
Yegen (MT) series.
Absarook, Archmesa, Burtoner, Gurney, Maudlin, Moen, Moento, Pianohill, and Watrous soils are moderately deep to a lithic contact.
Beartooth, Bielenberg, Clasoil, Dooley, Doughty, Empedrado, Fairfield, Farnuf, Farside, Felor, Greenway, Hangdo, High, Hyalite, Kokorudu, Livona, Martinsdale, Meagher, Sipple, Trag, Tragmon, Trazuni, Trujillo, Vida, Watne, Williams, and Yegen soils do not have redoximorphic features.
Beeno, Clancy, Hoppers, Jeffcity, Placerton, Reeder, and Reedwest soils are moderately deep to a paralithic contact.
Bookcliff soils are deep to a lithic contact of sandstone.
Snakejohn soils have a calcic horizon.
Ulrant soils formed in granitic parent materials and have more than 15 percent granitic gravel in the profile.
In addition, Absarook, Archmesa, Beartooth, Beeno, Bielenberg, Burtoner, Clancy, Clasoil, Dooley, Doughty, Empedrado, Fairfield, Farnuf, Farside, Felor, Greenway, Gurney, High, Hoppers, Hyalite, Jeffcity, Kokoruda, Livona, Martinsdale, Maudlin, Meagher, Moen, Moento, Pianohill, Placerton, Reeder, Reedwest, Sipple, Trag, Tragmon, Trujillo, Ulrant, Vida, Watne, Watrous, Williams, and Yegen soils are in LRR-E, LRR-F, or LRR-G, and are moist in
May and June.
GEOGRAPHIC SETTING: The Trazuni soils formed in eolian and alluvial materials derived from sandstone and are on mesas, cuestas and hills. Slopes are 1 to 5 percent. Elevations range from 7100 to 7500 feet. The mean annual temperature is 40 to 45 degrees F., and the mean annual precipitation is 16 to 20 inches. The frost free period is 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Shoemaker, Stout, Techado and Valnor soils on mesas, cuestas and hills. The Shoemaker and Valnor soils are moderately deep to sandstone and shale respectively. The Stout and Techado are very shallow and shallow to sandstone and shale respectively.
DRAINAGE AND PERMEABILITY: Well drained, slow runoff, and moderate permeability.
USE AND VEGETATION: This series is used for wood products. The present vegetation is ponderosa pine with an understory of alligator and Rocky Mountain juniper, rabbitbrush, Arizona fescue, prairie junegrass, mountain muhly, blue grama, bottlebrush squirreltail, muttongrass and western wheatgrass.
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 PROPOSED: McKinley County Area, New Mexico; McKinley County and Parts of Cibola and San Juan Counties, 1991. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: The zone from 0 to 12 inches. (A and Bw horizons)
Argillic horizon: The zone from 12 to 39 inches. (Bt1, Bt2 and Bt3 horizons)
The presence of rust colored mottles at 47 inches. (C2 horizon)
Classified according to Soil Taxonomy Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
Because this soil was not correlated (established) when the McKinley County Area was correlated in 2001, it may have slipped through the cracks and should have been dropped. Need for this series should be evaluated during the update of MLRA 35 and proper disposition made then.