LOCATION BUTTONFLAT WY
Tentative Series
IRD DPG/DJP/CBR
04/2020
BUTTONFLAT SERIES
The BUTTONFLAT series consists of very deep, moderately well drained soils that formed in alluvium derived from interbedded sedimentary rocks. These soils are on floodplain steps. Slopes are 0 to 2 percent. Mean annual precipitation is about 280 mm and mean annual air temperature is about 4 degrees C.
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Cumulic Haploxerolls
TYPICAL PEDON: Buttonflat silty clay loam in irrigated hayland. (Colors are for moist soil unless otherwise noted.)
A--0 to 12 cm; dark brown (7.5YR 3/2) silty clay loam, brown (7.5YR 4/3) dry; weak fine granular structure; soft, friable, moderately sticky and moderately plastic; many very fine and fine roots; many very fine and fine tubular pores; finely disseminated carbonates; very slightly effervescent; slightly alkaline (pH 7.6); gradual smooth boundary. (6 to 12 centimeters thick)
Bw1--12 to 39 cm; dark brown (7.5YR 3/2) silty clay loam, brown (7.5YR 4/3) dry; weak fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; many very fine and fine tubular pores; finely disseminated carbonates; very slightly effervescent; slightly alkaline (pH 7.6); clear smooth boundary.
Bw2--39 to 90 cm; dark brown (7.5YR 3/2) silty clay loam, brown (7.5YR 4/3) dry; weak medium subangular blocky structure; slightly hard, friable, very sticky and very plastic; common very fine roots; common very fine and fine tubular pores; very slightly effervescent; 5 percent few fine distinct yellowish red (5YR 4/6) masses of oxidized iron in the matrix; slightly alkaline (pH 7.8); clear smooth boundary. (Combined thickness of the Bw horizons is 35 to 105 centimeters)
BC--90 to 117 cm; dark grayish brown (10YR 4/2) silt loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common fine roots; common fine tubular pores; very slightly effervescent; 15 percent common fine irregular carbonate masses in the matrix; 15 percent common medium prominent yellowish red (5YR 4/6) masses of oxidized iron in the matrix; slightly alkaline (pH 7.8); clear smooth boundary. (0 to 40 centimeters thick)
Cg1--117 to 140 cm; dark gray (7.5YR 4/1) loam, brown (7.5YR 5/2) dry; massive; slightly hard, friable, moderately sticky and moderately plastic; finely disseminated carbonates; reduced matrix; 10 percent common medium prominent yellowish red (5YR 4/6) masses of oxidized iron in the matrix; very slightly effervescent; slightly alkaline (pH 7.6); clear smooth boundary. (20 to 30 centimeters thick)
Cg2--140 to 200 cm; very dark gray (7.5YR 3/1) gravelly loam, brown (7.5YR 4/2) dry; massive; slightly hard, friable, moderately sticky and moderately plastic; finely disseminated carbonates; reduced matrix; 30 percent many coarse distinct yellowish red (5YR 4/6) masses of oxidized iron in the matrix; very slightly effervescent; 25 percent rounded gravels; slightly alkaline (pH 7.6); clear smooth boundary.
TYPE LOCATION: Lincoln County, Wyoming; USGS Nugent Park topographic quadrangle; latitude 42 degrees 14minutes 38.32 seconds north, longitude 110 degrees 52 minutes 25.05 seconds west, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.0 to 7.0 degrees C
Thickness of mollic epipedon--50 to 100 centimeters
Depth to water table--90 to 150 centimeters
Particle-size control section (weighted averages)
Clay content-18 to 35 percent
Sand content--less than 15 percent (0.1 to 75mm fraction)
A horizon(s)
Hue--7.5YR to 10YR
Value--2 to 3 moist, 3 to 4 dry
Chroma--2 to 3
Texture (less than 2 mm fraction)--silty clay loam
Clay content--27 to 30 percent
Sand content--less than 15 percent fine sand or coarser (0.1 to 75mm fraction)
Reaction--pH 7.4 to 7.8
Bw horizon(s)
Hue--7.5YR to 10YR
Value--2 to 3 moist, 3 to 4 dry
Chroma--2 to 3
Texture (less than 2 mm fraction)--silty clay loam
Clay content--28 to 36 percent
Sand content--less than 15 percent fine sand or coarser (0.1 to 75mm fraction)
Reaction--pH 7.4 to 8.0
BC horizon(s) (when present)
Hue--7.5YR to 10YR
Value--2 to 4 moist, 3 to 5 dry
Chroma--2 to 3
Texture (less than 2 mm fraction)--silt loam
Clay content--24 to 27 percent
Sand content--5 to 15 percent
Reaction--pH 7.6 to 8.0
C horizon(s)
Hue--7.5YR to 10YR
Value--2 to 4 moist,
Chroma--1 to 3
Texture (less than 2 mm fraction)--loam
Clay content--22 to 26 percent
Fragment content--15 to 40 percent gravels
Reaction--pH 7.4 to 7.8
COMPETING SERIES:
Widowspring (OR) --are derived from mixed igneous sources
GEOGRAPHIC SETTING:
Landform--floodplain steps
Elevation--1900 to 2110 meters
Slope--0 to 2 percent
Parent material--alluvium derived from interbedded sedimentary geology
Climate--long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation--225 to 375 mm
Mean annual air temperature--2.0 to 6.0 degrees C
Frost-free period--40 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: moderately well drained, 1.5 to 5.0 um/sec.
USE AND VEGETATION: Buttonflat soils are primarily used for irrigated pasture and hayland. The potential native vegetation is mainly Garrison creeping meadow foxtail, meadow bromegrass, orchardgrass, timothy, tufted hairgrass, and other sedges, rushes, and forbs.
DISTRIBUTION AND EXTENT: Buttonflat soils are of small extent in western Wyoming; MLRA 13.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Lincoln County, Wyoming, 2020. The Buttonflat series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon--0 to 90 cm (A and parts of the Bw horizons)
Redoximorphic features--39 to 200 cm (Bw, BC, and C horizons)
Particle-size control section--25 to 100 cm
Buttonflat soils have a frigid temperature regime and a xeric moisture regime.
Taxonomic version: Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.