LOCATION TYRONE COEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Ustic Natrargids
TYPICAL PEDON: Tyrone silt loam in grassland. (Colors are for dry soil unless otherwise.
A--0 to 10 centimeters (0 to 4 inches); light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; moderate medium granular structure; soft, very friable, slightly sticky, slightly plastic; calcareous; moderately alkaline (pH 8.2); calcium carbonate equivalent 7 percent; ESP 2 percent; clear smooth boundary. (8 to 13 centimeters (3 to 5 inches) thick)
B--10 to 18 centimeters (4 to 7 inches); light brownish gray (10YR 6/2) heavy silt loam, dark grayish brown moist; moderate fine subangular blocky structure that parts to coarse granules; slightly hard, very very friable, slightly sticky, slightly plastic; primary peds are hard; calcium carbonate equivalent approximately 5 percent; ESP 3 percent; calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (0 to 10 centimeters (0 to 4 inches) thick)
Bt1--18 to 30 centimeters (7 to 12 inches); very pale brown (10YR 7/3) light silty clay loam, brown (10YR 5/3) moist; moderate coarse prismatic structure that parts to fine and medium angular and subangular blocks; slightly hard, very friable, slightly sticky, slightly plastic; peds are very hard, firm; nearly continuous glossy coatings on the faces of peds and wax-like coatings and fillings on the inside of root channels and pores; calcium carbonate equivalent approximately; moderately alkaline; clear smooth boundary. (8 to 25 centimeters (3 to 10 inches) thick)
Bt2--30 to 56 centimeters (12 to 22 inches); very pale brown (10YR 7/3) heavy silty clay loam, brown (10YR 5/3) moist; moderate coarse prismatic structure that parts to medium angular and subangular blocks; slightly hard, very friable, slightly sticky, slightly plastic; peds are very hard, firm; nearly continuous glossy coatings on the faces of peds and wax-like fillings on the inside of root channels and pores; calcium carbonate equivalent approximately 18 percent; exchangeable sodium percentage 17; calcareous; visible secondary calcium carbonate and some calcium sulfate occurring as small concretions, as crystals, and in thin seams and streaks; moderately alkaline (pH 8.2); gradual smooth boundary. (8 to 28 centimeters (3 to 11 inches) thick)
Bk--56 to 69 centimeters (22 to 27 inches); very pale brown (10YR 7/3) heavy silt loam, brown (10Yr 5/3) moist; weak medium prismatic structure that parts to medium subangular blocks; slightly hard, friable, slightly sticky, slightly plastic; peds are very hard, firm; few thin glossy patches on some peds and discontinuous glossy coatings in some root channels and pores; visible secondary calcium carbonate occurring as small concretions and in thin seams and streaks; many gypsum crystals; calcium carbonate equivalent 25 percent; exchangeable sodium percentage sodium percentage 20; calcareous; moderately alkaline (pH 8.4); gradual smooth boundary. (8 to 25 centimeters (3 to 10 inches) thick)
Ck--69 to 114 centimeters (27 to 45 inches); very pale brown (10YR 7/3) silt loam, pale brown (10YR 6/3) moist; massive; very hard, friable, slightly sticky, slightly plastic; visible secondary calcium carbonate occurring as small concretions and in thin seams and streaks; many gypsum crystals; calcium carbon ate equivalent 30 percent; exchangeable sodium percentage 30; calcareous; calcium carbonate equivalent 30 percent; exchangeable sodium percentage 30; calcareous; strongly alkaline (pH 8.6).
TYPE LOCATION: Las Animas County, Colorado; approximately 472 meters (1,550 feet) east and 91 meters (300 feet) south of NW corner Sec. 34, T. 29 S., R. 61 W.
RANGE IN CHARACTERISTICS:
Depth to argillic horizon: 8 to 23 centimeters (3 to 9 inches)
Depth to visible secondary calcium carbonate and/or sulfate: 13 to 38 centimeters (5 to 15 inches)
Conductivity (mmhos/cm): 0 to 14
Particle-size control section (weighted average):
Clay content: 18 to 35 percent
Silt content: 30 to 65 percent
Sand content: 5 to 40 percent
Rock fragments: 0 to 5 percent
Size: gravel
A horizon:
Hue: 5Y to 7.5YR
Value: 5 to 8, and 3 to 7 moist
Chroma: 1 to 4
Reaction: moderately or strongly alkaline (1:5 dilution unbuffered organic dye)
B horizon:
Hue: 5Y to 7.5YR
Value: 5 to 8, 4 to 7 moist
Chroma: 1 to 6
Texture: silt loam or light silty clay loam
Clay content: 18 to 35 percent
Silt content: 30 to 65 percent
Sand content: 5 to 40 percent
Reaction: moderately to very strongly alkaline
C horizon:
Hue: 5Y to 7.5YR
Texture: silt loam or light silty clay loam
Reaction: moderately to very strongly alkaline (1:5 dilution unbuffered organic dye)
COMPETING SERIES: Currently these are no competing series.
GEOGRAPHIC SETTING:
Parent Material: thick, limy, silty materials weathered from marl, limestone, and very limy earth of the Niobrara or similar formation
Landform: gently to moderately sloping alluvial fans and valley side slopes
Slope: 2 to 20 percent
Mean annual temperature: 8 degrees C. (46 degrees F.)
Mean annual precipitation: 36 centimeters (14 inches)
Precipitation pattern: peak periods of precipitation in the spring and early summer months
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Manvel and Modell series.
Manvel and Modell soils lack a natric horizon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: well drained
Runoff medium to rapid
Saturated Hydraulic Conductivity: moderately low to high
USE AND VEGETATION: Used primarily as grazing land but occasionally as cropland.
Native vegetation is blue grama, buffalo grass, cactus, sage, snakeweed, western wheatgrass.
DISTRIBUTION AND EXTENT: Southeastern Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Prowers County, Colorado, 1963.
REMARKS: Diagnostic horizons and features recognized in this profile are:
Argillic horizon: 18 to 56 centimeters (7 to 22 inches) (Bt horizon)
Secondary carbonates: 30 to 114 centimeters (12 to 45 inches) (Bt2, Bk, and Ck horizon)
OSED scanned and cleaned up by Colorado. Series last revised by state on 4/73.
Updated the classification, competing series and placed in semitab format. LRM 03/01
Modified format by LRM in 6/2006 to include metric conversion and change permeability to saturated hydraulic conductivity.