LOCATION MILLETT AZ NM UT
Established Series
Rev. MLM/JEJ/RLB
09/2018
MILLETT SERIES
The Millett series consists of very deep, well drained soils formed in alluvium weathered from old gravelly alluvium known as "rim gravels". This material is composed of quartzite, sandstone and some basic igneous rocks. Millett soils are on stream and fan terraces on plateaus and footslopes and shoulders on stable landslides. Slopes are 1 to 35 percent. Mean annual precipitation is about 11 inches and the mean annual air temperature is about 53 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ustic Calciargids
TYPICAL PEDON: Millett gravelly sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; reddish brown (5YR 4/3) gravelly sandy loam, dark reddish brown (5YR 3/3) moist, weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; few fine roots; many fine interstitial pores; 20 percent gravel; slightly effervescent; moderately alkaline; clear smooth boundary. (1 to 4 inches thick)
Bt1--2 to 4 inches; reddish brown (5YR 4/4) gravelly clay loam, dark reddish brown (5YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; common fine tubular pores; few faint clay films on faces of peds and in pores; 15 percent gravel; slightly effervescent; moderately alkaline; clear wavy boundary. (2 to 6 inches thick)
Bt2--4 to 10 inches; pinkish gray (5YR 7/2) clay loam, dark reddish brown (5YR 3/4) moist; weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common fine tubular pores; few faint clay films on faces of peds; 10 percent gravel; strongly effervescent; moderately alkaline; clear wavy boundary. (3 to 10 inches thick)
Bk1--10 to 18 inches; pinkish gray (5YR 7/2) gravelly loam, light reddish brown (5YR 6/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; few fine tubular pores; 20 percent gravel, many medium calcium carbonate masses; violently effervescent; moderately alkaline; clear wavy boundary. (8 to 14 inches thick)
2Bk2--18 to 60 inches; reddish brown (5YR 5/4) very gravelly sandy clay loam, dark reddish brown (5YR 3/4) moist; massive; slightly hard, friable, sticky and plastic; few fine tubular pores; 55 percent gravel; many large calcium carbonate masses; moderately alkaline.
TYPE LOCATION: Apache County, Arizona; Northeast 1/4 of section 5, T. 13 N., R. 25 E., approximately 10 feet north of the road and 0.9 mile west of the windmill.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the soil moisture control section during July-September and December-February. Driest during May and June. Ustic aridic soil moisture regime.
Rock Fragments - 5 to 35 percent gravel and cobble in the argillic horizon and 25 to 75 percent below
Depth to calcic horizon - 5 to 20 inches
Organic Matter - Surface layer to a depth of 7 inches contains more than 1 percent organic matter
Depth to base of Bt - 6 to 20 inches
Calcium carbonate - 15 to 30 percent in the calcic horizon as secondary and disseminated lime
Effervescence - Slight effervescent in the upper part; strongly effervescent or violently effervescent in the lower part. A few pedons are noneffervescent in the upper part
A horizon
Hue: 5YR, 7.5YR, 2.5YR
Value: 4 or 5 dry, 3, 4 or 5 moist
Chroma: 2 through 6, dry or moist
Bt horizon
Hue: 2.5YR, 5YR, 7.5YR
Value: 3 through 6 dry, 3 or 4 moist
Chroma: 3 through 6, dry or moist
Texture: loam, sandy clay loam, clay loam, fine sandy loam, sandy loam (18 to 35 percent clay)
Bk horizon
Hue: 2.5YR, 5YR
Value: 5 through 8 dry, 5, 6 or 7 moist
Chroma: 2 through 6, dry or moist
Texture: loam, sandy loam, sandy clay loam, fine sandy loam, loamy sand, clay loam; a few pedons have thin sand layers
COMPETING SERIES: These are the
Barx (UT),
Cerrillos (NM),
Clovis (NM),
Fernando (NM),
Flaco (NM),
Horchata (NM),
Los Alamos (NM),
Maysdorf (WY), Millett (AZ),
Palabria (NM),
Progresso (CO),
Sanostee (NM),
Scholle (NM),
Selpats (WY),
Solirec (UT),
Spenlo (UT),
Threetop (WY),
Tuweep (AZ) and
Wineg (AZ) series.
Barx soils do not have gravelly or very gravelly horizons below 20 inches.
Barx,
Cerrillos and
Spenlo soils have 2.5YR to 7.5YR hue.
Cerrillos and
Clovis soils are nongravelly throughout.
Clovis soils receive more than half of its annual precipitation between the months of July and October.
Fernando,
Maysdorf, and
Spenlo soils do not have calcic horizons within 20 inches of the surface.
Fernando soils contain 50 to 80 percent silt in the solum and mapped in MLRA 51.
Flaco,
Horchata,
Progresso,
Sanostee and
Threetop soils have lithic or paralithic contacts within 40 inches.
Maysdorf soils contain less than 15 percent carbonates in the calcic horizon.
Horchata soils are moderately deep to a lithic contact.
Los Alamos soils have 5 to 15 percent pumice fragments and ash in the particle size control section, and Bt horizon thickness range from 6 to 14 inches.
Millett soils contain 25 to 75 percent gravel and cobbles in the lower part of the solum.
Flaco,
Progresso,
Sanostee, and
Threetop soils are moderately deep over bedrock.
Selpats soils have skeletal lithologic discontinuity at depths ranging from 15 to 39 inches.
Palabria series are deep soils with sandstone bedrock between 40 to 60 inches.
Scholle soils contain 15 to 35 percent gravel in the control section.
Solirec soils do not have 2.5Y hue and receive maximum precipitation in spring and fall.
Threetop soils are moist in the soil moisture control section during
May and June.
Threetop soils have a lithic contact at 20 to 40 inches.
Tuweep soils have yellower hue and developed in basalt and pyroclastic parent materials.
Wineg soils have a MAST of 56 degrees F, and have mixed gravelly alluvium or lacustrine parent material.
GEOGRAPHIC SETTING: Millett soils are on stream and fan terraces on plateaus and footslopes and shoulders on stable landslides. They formed in old gravelly alluvium derived from quartzite, sandstone, and some basic igneous rocks. Elevation is 4,950 to 7,000 feet. The mean annual precipitation ranges from 9 to 13 inches and about one-half of the total falls in July, August and September. Ranges to 8 inches in northeastern Arizona and northwestern New Mexico. The mean annual air temperature is 50 to 57 degrees F. The frost-free period is 120 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Claysprings,
Barx,
Jocity,
Kopie,
Navajo and
Tours soils. Claysprings and Kopie soils are shallow over bedrock and do not have argillic horizons. Jocity, Navajo and Tours soils are on floodplains and do not have diagnostic horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Used mainly for livestock grazing and as a source of construction aggregate. Vegetation is blue grama, black grama, Indian ricegrass, galleta, Mormon-tea, and some juniper trees. Small areas are irrigated and used for growing small grains, alfalfa and some truck crops.
DISTRIBUTION AND EXTENT: Northern Arizona and northern New Mexico. The soils are moderately extensive. MLRA 35 & 36.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Navajo County, Arizona; Holbrook-Show Low Area Soil Survey; 1961.
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 10 inches (Bt1, Bt2 horizons)
Calcic horizon - The zone from 10 to 40 inches (Bk1, 2Bk2 horizons)
Updated and revised for the correlation of Kane County (UT642) CEM
National Cooperative Soil Survey
U.S.A.