LOCATION TINYTOWN COEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Aridic Haplustolls
TYPICAL PEDON: Tinytown gravelly coarse sandy loam - grassland. (Colors are for dry soil unless otherwise noted.)
A11--0 to 6 inches; weak red (2.5YR 4/2) gravelly coarse sandy loam, very dusky red (2.5YR 2/2) moist; moderate fine granular structure, slightly hard, very friable; 20 percent fine and very fine angular granite gravel; neutral; clear smooth boundary. (4 to 10 inches thick)
A12--6 to 12 inches; reddish brown (2.5YR 5/3) gravelly coarse sandy loam, dark reddish brown (2.5YR 3/3) moist; moderate medium subangular blocky structure that parts to fine granules; hard, very friable, slightly sticky, slightly plastic; 20 percent fine and very fine angular granite gravel; neutral; clear smooth boundary. (6 to 10 inches thick)
B2--12 to 20 inches; weak red (10R 5/4) gravelly coarse sandy loam, weak red (10R 4/4) moist; weak medium prismatic structure that parts to medium subangular blocks; very hard, very friable; peds are extremely hard, very friable; 30 percent fine and very fine angular granite gravel; neutral; gradual smooth boundary. (7 to 20 inches thick)
C--20 to 60 inches; reddish brown (2.5YR 5/4) gravelly coarse sandy loam, reddish brown (2.5YR 4/4) moist; massive; extremely hard, very friable; 30 percent fine and very fine angular granite gravel; neutral.
TYPE LOCATION: Douglas County, Colorado; 1,200 feet north and 300 feet east of the S1/4 corner of Sec. 32, T. 10 S., R. 67 W.
RANGE IN CHARACTERISTICS: Tinytown soils typically are noncalcareous to depths of more than 60 inches but depth to uniformly calcareous material ranges from 40 to more than 60 inches. Base saturation typically is more than 80 percent and range from 60 to 100 percent. The control section is usually gravelly coarse sandy loam and has 5 to 18 percent clay, 5 to 35 percent silt, and 50 to 80 percent sand with more than 35 percent being fine or coarser sand. A large proportion of the sand fraction is medium, coarse, and very coarse angular granite sand which has a high percentage of flat bearing surfaces between sand grains. Rock fragments range from 15 to 35 percent by volume in the major part of the solum and are mainly less than 3 inches in diameter but range from 1/8 to 10 inches in diameter. The solum and C horizon range from slightly acid through mildly alkaline. The mean annual soil temperature is 45 degrees F., and the mean summer soil temperature is 63 degrees F.
The A horizon has hue of 10YR through 2.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 through 3.
The B2 horizon has hue of 5YR through 10R, value of 5 through 7 dry, 4 through 6 moist, and chroma of 1 through 6.
The C horizon has hue of 5YR through 10R.
COMPETING SERIES: These are the Chinook, Cozberg, Pring, and Rhame series. Chinook and Cozberg soils are calcareous above depth of 40 inches and have continuous subhorizons of secondary calcium carbonate accumulation. Pring soils have hue of 7.5YR or yellower. Rhame soils are calcareous above depth of 40 inches, and have hue yellower than 5YR.
GEOGRAPHIC SETTING: Tinytown soils are on alluvial fans or valley side slopes. Slope gradients range from 1 to 30 or more percent. The soils formed in material derived principally from reddish-brown arkose beds of the Fountain and Lyons formations. At the type location the average annual precipitation is about 17 inches, with peak periods of precipitation occurring in the spring and summer.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cheeseman and Garber soils. Cheeseman soils have sandy clay loam argillic horizons. Garber soils have more than 35 percent rock fragments and have mollic epipedons more than 16 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used principally as native pastureland; however, they are tilled in some small areas. Native vegetation is mainly big bluestem, little bluestem, sandreed grass, needleandthread grass, and blue grama.
DISTRIBUTION AND EXTENT: The foothill areas of east-central Colorado. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Douglas County, Colorado, 1974.
REMARKS: OSED scanned by NSSQA and cleaned up by Colorado. Last revised by state on 8/74.