LOCATION CHAZNER AZ+NMEstablished Series
TAXONOMIC CLASS: Fine-loamy, carbonatic, mesic Petrocalcic Paleustalfs
TYPICAL PEDON: Chazner very cobbly very fine sandy loam -- on a planar fan terrace tread sloping 12 percent to the east at 6,600 feet elevation -- woodland. (Colors are for dry soil unless otherwise noted. When described, the soil was moist from 1 through 18 inches and otherwise dry throughout.)
A--0 to 2 inches; reddish brown (5YR 4/4) very cobbly very fine sandy loam, dark reddish brown (5YR 3/3) moist; moderate thick platy structure; soft, very friable, slightly sticky and nonplastic; common medium and few fine and very fine roots; few fine irregular pores; 25 percent cobble, 20 percent gravel, and 5 percent stones; very slightly effervescent; neutral (pH 7.0); abrupt smooth boundary. (1 or 2 inches thick)
BA--2 to 6 inches; reddish brown (5YR 5/4) gravelly very fine sandy loam, dark reddish brown (5YR 3/4) moist; weak coarse subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine and very fine and few medium roots; common fine tubular pores; very few faint clay films on faces of peds and lining pores; 10 percent gravel, 5 percent cobble and 5 percent stones; violently effervescent; slightly alkaline (pH 7.8); clear smooth boundary. (3 to 10 inches thick)
Btk1--6 to 11 inches; reddish brown (5YR 5/4) gravelly sandy clay loam, dark reddish brown (5YR 3/4) moist; moderate coarse subangular blocky structure; hard, firm, sticky and plastic; common very fine and few fine and coarse roots; common fine and few medium tubular pores; common faint clay films on faces of peds and lining pores; 15 percent gravel and 5 percent cobble; violently effervescent, secondary calcium carbonate segregated as medium irregularly shaped accumulations on rock fragments and as weakly cemented nodules; slightly alkaline (pH 7.8); clear smooth boundary. (5 to 9 inches thick)
Btk2--11 to 18 inches; light brown (7.5YR 6/4) gravelly sandy clay loam, brown (7.5YR 5/4) moist; moderate medium subangular blocky structure; hard, friable, sticky and slightly plastic; common very fine and few coarse roots; common fine and medium tubular pores; common faint clay films on faces of peds and lining pores; 20 percent gravel and 5 percent cobble; violently effervescent, secondary calcium carbonate segregated as common medium irregularly shaped accumulations in soft masses and nodules and on ped faces and rock fragments; moderately alkaline (pH 8.0); abrupt smooth boundary. (5 to 11 inches thick)
2Bk--18 to 29 inches; white (N 8/0) very cobbly coarse sandy loam, pinkish white (7.5YR 8/2) moist; weak coarse subangular blocky structure; extremely hard, extremely firm, slightly sticky and nonplastic; common very fine and few coarse roots; common fine and few very fine tubular pores; few lenses of reddish brown (5YR 5/4) fine sandy loam about 1 inch thick, reddish brown (5YR 4/4) moist; 35 percent cobble, 15 percent gravel and 5 percent stones; violently effervescent, matrix is impregnated and weakly cemented with secondary calcium carbonate; moderately alkaline (pH 8.2); abrupt smooth boundary. (6 to 10 inches thick)
2Bkm--29 to 60 inches; indurated calcium carbonate hardpan with roots matted on thin laminar cap.
TYPE LOCATION: Apache County, Arizona; on the Navajo Indian Reservation about 7.5 miles south-southeast of Teec Nos Pos; 100 feet east and 1,850 feet north of the southwest corner of section 6, T.39 N., R.31 E.; Latitude 36 degrees 48 minutes 54 seconds North and Longitude 109 degrees 4 minutes 1 second West.
RANGE IN CHARACTERISTICS:
Soil moisture - The soil moisture control section is moist in all parts during the 60 days following the winter solstice. It is moist in some part less than 40 percent of the time and moist in all parts less than 25 percent of the time when the soil temperature at 20 inches is above 41 degrees F. December and August are the wettest months and May and June are the driest. Aridic ustic soil moisture regime.
Soil temperature - 50 to 52 degrees F.
Depth to petrocalcic horizon - 20 to 40 inches
Depth to base of argillic horizon - 15 to 30 inches
Depth to calcic horizon - 6 to 12 inches
Rock fragments - 15 to 35 percent
A horizon
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist (when color values meet requirements for mollic, the thickness is less than 6 inches)
Organic carbon content: 0.6 to 2 percent
Calcium carbonate equivalent: 1 to 3 percent
Rock fragments: 35 to 60 percent
20 to 30 percent gravel
10 to 25 percent cobble
0 to 5 percent stones
BA horizon
Value: 3 or 4 moist
Chroma: 3 through 6, dry or moist
Organic carbon content: 0.6 to 2 percent
Calcium carbonate equivalent: 3 to 5 percent
Texture: very fine sandy loam, fine sandy loam
Rock fragments: 15 to 35 percent
10 to 25 percent gravel
5 to 10 percent cobble
Btk horizons
Hue: 5YR, 7.5YR
Value: 5 through 7 dry, 3 through 6 moist
Chroma: 4 through 6, dry or moist
Organic carbon content: less than 0.6 percent
Texture: sandy clay loam, clay loam
Clay content: 18 to 35 percent
Calcium carbonate equivalent, <20mm: 40 to 70 percent
Rock fragments: 15 to 35 percent
10 to 25 percent gravel
5 to 10 percent cobble
Bk horizon
Hue: 5YR, 7.5YR
Value: 7 or 8 dry, 6 through 8 moist
Chroma: 0 through 4, dry or moist
Organic carbon content: less than 0.6 percent
Texture: coarse sandy loam, sandy loam
Calcium carbonate equivalent, <20mm: 70 to 95 percent
Rock fragments: 10 to 20 percent gravel
25 to 35 percent cobble
0 to 5 percent stones
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Chazner soils are on treads of fan terraces. They formed in alluvium derived from calcareous Tertiary quartz diorite and Jurassic sandstone. Slopes range from 5 to 15 percent. Elevation ranges from 6,200 to 7,200 feet. The mean annual precipitation is 12 to 16 inches with about half falling as winter snow and half falling as rain from high intensity convective thunderstorms between July and September. The mean annual air temperature is 48 to 50 degrees F. The frost-free period is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Katzine, Tsezhin, and Wetherill soils. Katzine soils are loamy-skeletal, very deep, and occur on adjacent risers of fan terraces. Tsezhin soils are loamy-skeletal, very deep, and occur on younger surfaces. Wetherill soils are fine-silty, very deep, and occur on eolian mantled surfaces.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Chazner soils are used for livestock grazing and fuelwood production. Present vegetation is Utah juniper, pinyon, Wyoming big sagebrush, black sagebrush, datil yucca, green Mormon-tea, muttongrass, and blue grama.
DISTRIBUTION AND EXTENT: Chazner soils are of small extent on the Red Rock Bench portion-Canyonlands Section of the Colorado Plateau province in northeast Arizona and northwest New Mexico. LRR-D; MLRA 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Shiprock Area, Parts of San Juan County, New Mexico and Apache County, Arizona; 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 6 inches (A, BA horizons)
Argillic horizon - The zone from 6 to 18 inches (Btk1, Btk2 horizons)
Calcic horizon - The zone from 6 to 29 inches (Btk1, Btk2, 2Bk horizons)
Petrocalcic horizon - The zone from 29 to 60 inches (2Bkm horizon)
Keys to Soil Taxonomy - Soils classified according to the Eighth Edition, 1998.