LOCATION NAUGHTON WY
Tentative Series
IRD DJP-CBR
04/2018
NAUGHTON SERIES
The Naughton series consists of very deep, well drained soils that formed in slope alluvium and colluvium derived from shale. These soils are on hillslopes and cuestas. Slopes are 1 to 20 percent. Mean annual precipitation is about 450 mm, and mean annual air temperature is about 1.2 degrees C.
TAXONOMIC CLASS: Fine, smectitic Typic Haplocryerts
TYPICAL PEDON: Naughton silty clay loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 8 cm; grayish brown (10YR 5/2) silty clay loam, black (10YR 2/1) moist; moderate medium subangular blocky structure; extremely hard, very firm, moderately sticky, moderately plastic; few fine and many very fine roots throughout; many very fine tubular pores; 9 percent gravel; slightly alkaline (pH 7.8); clear wavy boundary. (6 to 10 cm thick)
Btss1--8 to 60 cm; dark grayish brown (10YR 4/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; strong coarse angular blocky structure; extremely hard, slightly rigid, moderately sticky, moderately plastic; few medium and many very fine roots throughout; few fine and many very fine tubular pores; 5 percent gravel; 15 percent slickensides and 60 percent clay films on all faces of peds; slightly effervescent; moderately alkaline (pH 8.2); clear wavy boundary.
Btss2--60 to 80 cm; dark grayish brown (10YR 4/2) silty clay, brown (10YR 4/3) moist; strong coarse angular blocky structure; very hard, very firm, very sticky, very plastic; common very fine roots throughout; few very fine tubular pores; 5 percent gravel; 20 percent slickensides and 60 percent clay films on all faces of peds; slightly effervescent; moderately alkaline (pH 8.2); abrupt wavy boundary. (combined thickness of Btss horizons is 9 to 72 cm)
Btkss--80 to 122 cm; grayish brown (2.5Y 5/2) silty clay, light olive brown (2.5Y 5/3) moist; strong coarse angular blocky structure; extremely hard, very firm, very sticky, very plastic; few very fine tubular pores; 5 percent gravel; 50 percent slickensides and 30 percent clay films on all faces of peds; 5 percent calcium carbonate masses in matrix; strongly effervescent; 8 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); abrupt wavy boundary. (32 to 55 cm thick)
C--122 to 200 cm; gray (2.5Y 6/1) silty clay loam, light brownish gray (2.5Y 6/2) moist; massive; very hard, very firm, very sticky, very plastic; few very fine tubular pores; 20 percent paragravel; 40 percent pressure faces on all faces of peds; slightly effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Lincoln County, Wyoming; USGS Kemmerer Reservoir, Wyoming, topographic quadrangle; 41 degrees 55 minutes 39.67 seconds north latitude and 110 degrees 41 minutes 12.04 seconds west longitude, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature -- 1.6 to 3.1 degrees C.
Depth to argillic -- 6 to 10 cm
Particle-size control section (weighted averages)
Clay content -- 35 to 53 percent
Total rock fragments -- 0 to 10 percent
A horizon
Hue: 7.5YR to 2.5Y, dry or moist
Value: 4 or 5 dry; 2 to 4 moist
Chroma: 2 or 3 dry; 1 to 3 moist
Texture (less than 2 mm fraction): clay loam, silty clay loam
Clay content: 28 to 39 percent
Rock fragments: 5 to 25 percent gravel
Reaction: pH 7.4 to 8.4
Btss horizon(s)
Hue: 5YR to 2.5Y, dry or moist
Value: 3 to 5, dry or moist
Chroma: 2 to 4, dry or moist
Texture (less than 2 mm fraction): clay loam, clay, silty clay loam, silty clay, clay
Clay content: 35 to 55 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 7.6 to 8.2
Btkss horizon
Hue: 10YR or 2.5Y, dry or moist
Value: 4 or 5, dry or moist
Chroma: 2 to 4, dry or moist
Texture (less than 2 mm fraction): clay, silty clay
Clay content: 40 to 55 percent
Rock fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 4 to 10 percent
Reaction: pH 7.8 to 8.6
C horizon
Value: 4 to 7, dry or moist
Chroma: 1 to 3, dry or moist
Texture (less than 2 mm fraction): clay loam, clay, silty clay loam, silty clay
Clay content: 30 to 60 percent
Parafragments: 15 to 75 percent paragravel
Reaction: pH 7.2 to 8.6
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform -- hillslopes and cuestas
Elevation -- 2,120 to 2,510 meters
Slope -- 1 to 20 percent
Parent material -- slope alluvium and colluvium derived from shale
Climate -- long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation -- 375 to 575 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature -- 0.6 to 2.1 degrees C.
Frost-free period -- 15 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, 0.01 to 5.00 um/sec.
USE AND VEGETATION: Naughton soils are primarily used for rangeland. The potential native vegetation is little sagebrush, mountain brome, western wheatgrass, and yellow rabbitbrush.
DISTRIBUTION AND EXTENT: Naughton soils are of small extent in southwestern Wyoming. MLRA 34A and 46.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Lincoln County, Wyoming, 2018. The name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon -- 0 to 8 cm (A horizon)
Argillic horizon -- 8 to 122 cm (Btss1, Btss2, Btkss horizons)
Secondary calcium carbonate accumulations -- 80 to 122 cm (Btkss horizon)
Cracks that open and close periodically.
Particle-size control section -- 8 to 58 cm (part of the Btss1 horizon)
Naughton soils have a cryic temperature regime and an ustic moisture regime.
Taxonomic version: Twelfth edition, 2014
National Cooperative Soil Survey
U.S.A.