LOCATION ELDORADO OK+MOEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, active, thermic Typic Paleudolls
TYPICAL PEDON: Eldorado cherty silt loam - rangeland. (Colors are for moist soil unless otherwise stated.)
A1--0 to 11 inches, very dark grayish brown (10YR 3/2)cherty silt loam, grayish brown (10YR 5/2) dry; moderate medium and fine granular structure; hard, friable; about 20 percent chert fragments; slightly acid; gradual smooth boundary. (10 to 15 inches thick)
A2--11 to 20 inches, very dark grayish brown (10YR 3/2) very cherty silt loam, grayish brown (10YR 5/2) dry; moderate medium and fine granular structure; hard, friable; about 60 percent chert fragments; slightly acid; gradual smooth boundary. (0 to 20 inches thick)
Bt1--20 to 33 inches, brown (7.5YR 4/4) very cherty silty clay loam, brown (7.5YR 5/4) dry; moderate medium and fine granular structure; hard, friable; about 60 percent chert fragments; thin clay films on face of peds; moderately acid; gradual smooth boundary. (6 to 20 inches thick)
Bt2--33 to 60 inches, dark red (10R 3/6) very cherty clay, red (10R 4/6) dry; strong very fine blocky structure; very hard, firm; clay films on face of peds; about 60 to 70 percent chert fragments; moderately acid.
TYPE LOCATION: Craig County, Oklahoma; about 5 miles south on Oklahoma State Highway 82 from the intersection with U.S. Highway 66; 50 feet below the crest of the low hill on the east side of the road; 500 feet north of the southwest corner of sec. 15, T. 24 N., R. 21 E.
RANGE IN CHARACTERISTICS: Solum thickness and depth to cherty limestone bedrock is more than 60 inches.
Soil moisture: udic moisture regime.
Depth of mollic eppipedon: 10 to 24 inches.
Depth to argillic horizon: 10 to 35 inches
Particle-size control section (weighted average):
Clay content: 25 to 35 percent
Rock fragments: 35 to 90 percent limestone and chert
A horizon:
Hue: 7.5YR or 10YR
Value: 2 or 3
Chroma: 1 to 3
Texture: silt loam or loam
Rock fragments: 1 to 85 percent
Gravel size fragments: 1 to 85 percent
Cobble size fragments: 0 to 30 percent
Stone size fragments: 0 to 25 percent
Reaction: slightly acid to strongly acid
Upper Bt horizon:
Hue: 5YR to 10YR
Value: 3 or 4
Chroma: 3 to 6
Texture: silt loam, loam, clay loam, or silty clay loam
Clay content: 25 to 35 percent
Rock fragments: 35 to 85 percent
Gravel size fragements: 25 to 55 percent
Cobble size fragments: 5 to 35 percent
Stone size fragments: 0 to 5 percent
Reaction: slightly acid to strongly acid
Lower Bt horizon:
Hue: 10R to 5YR
Value: 3 or 4
Chroma: 6 or 8
Texture: loam, clay loam, silty clay loam, or clay
Clay content: 35 to 60 percent
Rock fragments: 35 to 90 percent
Gravel size fragments: 10 to 80 percent
Cobble size fragments: 10 to 35 percent
Stone size fragments: 0 to 5 percent
Reaction: slightly acid to strongly acid
2Bt horizon (where present):
Hue: 10R to 5YR
Value: 3 or 4
Chroma: 6 or 8
Texture: clay
Clay content: 35 to 60 percent
Rock fragments: 35 to 85 percent
Gravel size fragments: 2 to 60 percent
Cobble size fragments: 0 to 40 percent
Stone size fragments: 0 to 5 percent
Reaction: strongly acid to very strongly acid
Some parts of pedons have a weakly expressed B and A'2 horizon.
COMPETING SERIES: There are no other series in this family. Closely related series are:
Clareson soils are underlain by limestone bedrock between depths of 20 to 40 inches and average more than 35 percent clay in the upper 20 inches of the Bt horizon
Craig soils have base saturation between 35 and 50 percent in the upper part of the Bt horizon and average more than 35 percent clay in the upper 20 inches of the Bt horizon
Newtonia soils have less than 35 percent chert fragments in the upper 20 inches of the Bt horizon.
Olpe soils average more than 35 percent clay in the upper 20 inches of the Bt horizon.
Riverton soils have less than 50 percent base saturation in the Bt horizons.
GEOGRAPHIC SETTING:
Landscape: Uplands
Landform: Hills
Slope: 1 to 25 percent
Parent material: residuum weathered from chert limestone
Comments: many areas have a few inches of soil from chert free limestones or chert free sediments
Average annual precipitation: 37 to 43 inches
Annual Thornthwaite P-E index: 64 to 80
Average annual temperature: 58 degrees to about 62 degrees F.
Frost Free Days: 200 to 220.
GEOGRAPHICALLY ASSOCIATED SOILS:
Bates soils contain little or no chert and are 20 to 40 inches thick over sandstone bedrock.
Dennis soils are more clayey, have wetness mottles and contain little or no chert.
Parsons soils lack mollic epipedons and are more clayey, have wetness mottles and contain little or no chert.
Maplegrove soils are fine and are moderately well drained.
Newtonia soils are fine-silty.
DRAINAGE AND PERMEABILITY:
Drainage: well
Runoff: medium to high
Permeability: moderate
USE AND VEGETATION: The main use is for native range. The gentler slopes of less cherty areas are mainly cultivated to small grains and sorghums. The native vegetation is tall prairie grass, such as big bluestem.
DISTRIBUTION AND EXTENT: Northeastern Oklahoma, southwestern Missouri, northwestern Arkansas, and southeastern Kansas. The soil is moderately extensive.
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Cedar County, Missouri; 1909.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 20 to 40 inches. (Bt1 and Bt2 horizons)
Mollic epipedon: The zone from o to 20 inches. (A1 and A2 horizons)
Argillic horizon: The zone from 20 to 60 inches. (Bt1 and Bt2 horizons)
Remarks: The Eldorado soils were formerly classified in the Reddish Prairie great soil group. The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
7/19/01 - reformatted to semi tab. Added lithological discontinuity information
Taxonomic Version: Keys to Soil Taxonomy, Eighth Edition, 1998
ADDITIONAL DATA: