LOCATION YATTLE                  CO

Established Series
LAN
12/2022

YATTLE SERIES

The Yattle series consists of very deep, well drained soils that formed in alluvium derived from red sandstone. Yattle soils are on fans and terraces. Slopes range from 0 to 6 percent. Mean annual precipitation is about 13 inches and the mean annual temperature is about 52 degrees F.

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Ustic Haplocalcids

TYPICAL PEDON: Yattle fine sandy loam, on a southeast facing, 5 percent slope in grass at an elevation of 4,550 feet. (Colors are for dry soil unless otherwise noted.) When described on August 13, 1984 the soil was moist from 0 to 33 inches.

A--0 to 4 inches; reddish brown (5YR 4/4) fine sandy loam, dark reddish brown (5YR 3/4) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; few fine and very fine roots; strongly effervescent; slightly alkaline (pH 7.8); clear smooth boundary. (2 to 5 inches thick)

Bw1--4 to 28 inches; reddish brown (2.5YR 4/4) fine sandy loam, dark reddish brown (2.5YR 3/4) moist; massive; soft, very friable, nonsticky and nonplastic; few fine and very fine roots; strongly effervescent, 2 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); gradual smooth boundary.

Bw2--28 to 33 inches; reddish brown (2.5YR 4/4) fine sandy loam, dark reddish brown (2.5YR 3/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few fine and very fine roots; 15 percent pebbles; strongly effervescent, 2 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); clear smooth boundary. (Combined thickness of the Bw horizons is 18 to 30 inches)

Bk1--33 to 43 inches; reddish brown (2.5YR 5/4) fine sandy loam, dark red (2.5YR 3/6) moist, broken and reddish brown (2.5YR 4/4) moist, crushed; massive; hard, friable, slightly sticky and slightly plastic; many medium irregular soft carbonate masses; 5 percent pebbles; violently effervescent, 14 percent calcium carbonate equivalent; strongly alkaline (pH 8.8); clear smooth boundary. (7 to 14 inches thick)

Bk2--43 to 70 inches; reddish brown (2.5YR 5/4) fine sandy loam, dark red (2.5YR 3/6) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few medium irregular soft carbonate masses; 5 percent pebbles; violently effervescent, 5 percent calcium carbonate equivalent; strongly alkaline (pH 8.8).

TYPE LOCATION: Las Animas County, Colorado; about 22 miles east of Thatcher; located in an unsectionalized area near the mouth of Red Rock and the Purgatoire River canyons, T. 29 S., R. 56 W.; OV Mesa USGS quad; lat. 37 degrees 33 minutes 40 seconds N. and long. 103 degrees 39 minutes 10 seconds W., NAD 1927

RANGE IN CHARACTERISTICS:

Soil moisture: The soil moisture control section is moist May and June, moist intermittently July and August; aridic moisture regime bordering on ustic.
Mean annual soil temperature: 48 to 56 degrees F
Mean summer soil temperature: 70 to 76 degrees F
Depth to secondary calcium carbonate: 0 to 4 inches
Depth to calcic horizon: 20 to 35 inches
Depth to cambic horizon: 2 to 5 inches
Thickness of the cambic horizon: 18 to 30 inches

Particle-size control section (weighted average):
Clay content: 8 to 18 percent
Sand content: 45 to 70 percent
Rock fragments: 0 to 10 percent gravel

A horizon:
Hue: 5YR or 7.5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 or 4
Clay content: 5 to 18 percent
Rock fragments: 0 to 5 percent gravel
Calcium carbonate equivalent: 1 to 3 percent
Reaction: slightly alkaline or moderately alkaline

Bw horizons:
Hue: 2.5YR or 5YR
Value: 5 or 6 dry, 3 to 5 moist
Chroma: 4 to 6
Texture: fine sandy loam, very fine sandy loam, loam
Clay content: 8 to 18 percent
Rock fragments: 0 to 5 percent gravel
Calcium carbonate equivalent: 1 to 5 percent
Reaction: slightly alkaline or moderately alkaline

Bk horizons:
Hue: 2.5YR or 5YR
Value: 5 or 6 dry, 3 to 5 moist
Chroma: 4 to 6
Texture: fine sandy loam, sandy loam, loam
Clay content: 8 to 18 percent
Rock fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 5 to 15 percent
EC (mmhos/cm): 2 to 8
Gypsum: 0 to 2 percent
SAR: 1 to 8 percent
Reaction: moderately alkaline or strongly alkaline

COMPETING SERIES: These are the Abracon (UT), Thumbrock (UT), Chroder (CO), Chugcity (WY), Chupadera (NM), Cobbra (UT), Harvey (NM), Milok (UT), Mivida (UT), and Sazi (UT) series.
Abracon soils: have 15 to 40 percent calcium carbonate equivalent
Thumbrock soils: have a lithic contact at depths of 20 to 40 inches
Chroder soils: have hues of 7.5YR or 10YR
Chugcity soils: have a paralithic contact at depths of 20 to 40 inches
Cobbra soils: have a lithologic discontinuity at depths of 40 to 57 inches
Harvey soils: have 15 to 40 percent calcium carbonate equivalent
Milok soils: have a calcic horizon at depths of 6 to 20 inches
Mivida soils: have 15 to 40 percent calcium carbonate equivalent
Sazi soils: have a lithic contact at depths of 20 to 40 inches

GEOGRAPHIC SETTING:
Parent material: alluvium derived from red sandstone and siltstone
Landform: fans, terraces
Slopes: 0 to 6 percent
Elevation: 4,400 to 5,000 feet
Mean annual temperature: 50 to 54 degrees F
Mean annual precipitation: 12 to 14 inches
Precipitation pattern: peak periods from May through August, dries December through February
Frost-free period: 125 to 160 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Glenberg and Rizozo series.
The Glenberg soils have hues of 7.5YR or 10YR and are on terraces.
The Rizozo soils have a lithic contact at depths of less than 20 inches and are on scarps.

DRAINAGE AND PERMEABILITY: Well drained, low to very low runoff, moderately rapid permeability.

USE AND VEGETATION: Rangeland and wildlife habitat. Native vegetation is mainly blue grama, sand dropseed, sideoats grama, yucca, red threeawn, and prickly pear.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Salina, Kansas.

SERIES PROPOSED: Las Animas County, Colorado, Las Animas County Area soil survey area, Colorado. The name is coined.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (part of the Bw1, Bw2, and part of the Bk1 horizons)
Ochric epipedon: The zone from 0 to 4 inches. (A horizon)
Cambic horizon: The zone from 4 to 33 inches. (Bw1 and Bw2 horizons)
Calcic horizon: The zone from 33 to 43 inches. (Bk1 horizon)
Other features: Ustic aridic moisture regime

Remarks: Calcium carbonate equivalent was obtained from field measurements. This soil was originally considered to be in the Yarts series. Changes in soil taxonomy and the identification of consistent visible calcium carbonate in the control section resulted in a change to Ustic Haplocalcids.

The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.

Taxonomic Version: Second Edition, 1999

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National Cooperative Soil Survey
U.S.A.