LOCATION PERRYPARK CO
Established Series
Rev. GB/TWH
04/2016
PERRYPARK SERIES
The Perrypark series consists of very deep, well drained soils formed in locally transported alluvium from reddish brown arkose beds derived from sedimentary and granite bedrock. Perrypark soils are on alluvial fans and valley side slopes. Slopes range from 1 to 30 percent. The mean annual precipitation is about 19 inches and the mean annual temperature is about 43 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Perrypark coarse sandy loam - grassland. (Colors are for dry soil unless otherwise noted.)
A--0 to 7 inches; reddish gray (5YR 5/2) coarse sandy loam, dark reddish brown (5YR 3/2) moist; moderate fine granular structure; soft, very friable; 5 percent fine angular granite gravel; neutral (pH 6.8); clear smooth boundary. (5 to 10 inches thick)
BAt--7 to 12 inches; reddish gray (5YR 5/2) coarse sandy loam, dark reddish brown (5YR 3/2) moist; weak medium prismatic structure parting to medium subangular blocky; slightly hard, very friable; peds are very hard, very friable; thin clay films on some peds and in some root channels and pores; 5 percent fine angular granite gravel; neutral (pH 6.8); clear smooth boundary. (4 to 10 inches thick)
Bt--12 to 32 inches; reddish brown (2.5YR 5/4) coarse sandy clay loam, reddish brown (2.5YR 4/4) moist; moderate medium prismatic structure parting to medium and fine subangular blocky; hard, very friable, slightly sticky and slightly plastic; peds are extremely hard, very friable; nearly continuous clay films on peds and in root channels and pores; 5 percent fine angular granite gravel; neutral (pH 6.8); clear smooth boundary. (7 to 30 inches thick)
BC--32 to 40 inches; reddish brown (2.5YR 5/4) coarse sandy loam, reddish brown (2.5YR 4/4) moist; weak medium subangular blocky structure; extremely hard, friable; thin clay films on some peds and in some root channels and pores; 5 percent fine angular granite gravel; neutral (pH 6.8); gradual wavy boundary. (4 to 10 inches thick)
C--40 to 60 inches; light reddish brown (2.5YR 6/4) coarse sandy loam, reddish brown (2.5YR 5/4) moist; massive; extremely hard, very friable; 5 percent fine angular granite gravel; neutral (pH 6.8).
TYPE LOCATION: Douglas County, Colorado; about 7 miles north of Palmer Lake; 800 feet south and 400 feet east of the NW corner of the SW quarter of Sec. 31, T. 9 S, R. 67 W.; Larkspur USGS quad; lat. 39 degrees 13 minutes 22 seconds N. and long. 104 degrees 56 minutes 26 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section dries out in early summer and is intermittently moist in mid-summer through early fall; ustic moisture regime, typic subclass.
Mean annual soil temperature: 43 to 46 degrees F.
Mean summer soil temperature: 59 to 63 degrees F.
Perrypark soils typically are noncalcareous to depths of more than 60 inches but depth to uniformly calcareous material normally is 40 to 60 or more inches.
Base saturation: 60 to 100 percent; typically more than 80 percent
Depth to the base of the argillic horizon: 15 to 50 inches
A horizon
Hue: 10YR through 2.5YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 1 through 3.
Texture: sandy loam, coarse sandy loam, gravelly sandy loam
Rock fragment content: 0 to 20 percent; mainly gravel but cobble is included
Reaction slightly acid to slightly alkaline
Bt horizon
Hue: 5YR through 10R
Value: 5 through 7 dry, 3 through 7 dry, 3 through 6 moist
Chroma: 1 through 6
Texture: gravelly sandy clay loam, sandy clay loam, sandy loam
Clay content: 18 to 35 percent
Silt content: 5 to 30 percent silt
Sand content: 40 to 75 percent; more than 35 percent being fine or coarser sand. Within the sand fraction a large proportion is medium, coarse, and very coarse angular sand which has a high percentage of flat bearing surfaces between sand grains.
Rock fragment content: 0 to 20 percent; mainly gravel but cobble is included
Reaction slightly acid to slightly alkaline
C horizon
Hue: 5YR through 10R
Value: 5 through 7 dry, 4 through 6 moist
Chroma: 3 through 6
Texture: coarse sandy loam
Clay content: less than 18 percent
Rock fragment content: 0 to 20 percent; mainly gravel but cobble is included
Reaction slightly acid to slightly alkaline
COMPETING SERIES:
These are the
Absarook,
Archmesa,
Beartooth,
Beeno,
Bielenberg,
Bookcliff,
Burtoner,
Clancy,
Clasoil,
Dooley,
Doughty,
Empedrado,
Fairfield,
Farnuf,
Farside,
Felor,
Greenway,
Gurney,
Hangdo, High,
Hoppers,
Hyalite,
Jeffcity,
Kokoruda,
Livona,
Martinsdale,
Maudlin,
Meagher,
Moen,
Moento,
Pianohill,
Placerton,
Reeder,
Reedwest,
Sipple,
Snakejohn,
Sponseller,
Trag,
Tragmon,
Trazuni,
Trujillo,
Ulrant,
Vida,
Watne,
Watrous,
Williams, and
Yegen series.
Absarook,
Archmesa,
Beeno,
Bielenberg,
Bookcliff,
Burtoner,
Clancy,
Gurney,
Hoppers,
Jeffcity,
Maudlin,
Moen,
Moento,
Pianohill,
Placerton,
Reeder,
Reedwest,
Snakejohn,
Ulrant, and
Watrous soils: have a lithic paralithic contact within 60 inches.
Clasoil,
Greenway,
Hangdo,
Hyalite,
Trag,
Tragmon,
Trazuni soils have hue yellower than 2.5YR in the argillic horizon.
Beartooth,
Beeno,
Dooley,
Doughty,
Empedrado,
Fairfield,
Farnuf,
Felor,
Gurney, High,
Kokoruda,
Livona,
Martinsdale,
Meagher,
Sipple,
Trujillo,
Ulrant,
Vida,
Watne,
Williams, and
Yegen soils have secondary carbonate accumulations.
Sponseller soils have a cobble and cinder substratum.
GEOGRAPHIC SETTING: Perrypark soils are on alluvial fans and valley side slopes. Slopes range from 1 to 30 percent. The soil formed in parent materials locally transported from reddish brown arkose beds of the Lyons and Fountain formations. Elevation: 7,000 to 8,000 feet. Average annual precipitation is 18 to 22 inches, with peak periods of precipitation in the spring and summer. Average annual temperature: 42 to 47 degrees F. The frost-free period is less than 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Lonetree soils. Lonetree soils lack an argillic horizon and are coarse textured.
DRAINAGE AND PERMEABILITY: Well drained; medium to high runoff; moderate permeability.
USE AND VEGETATION: These soils are used as native range and as irrigated and dryland cropland. Native vegetation consists of mainly big and little bluestem, sandreed grass, blue grama, and needleandthread grass.
DISTRIBUTION AND EXTENT: The foothills and Black Forest areas of east-central Colorado; MLRA 48A and 49. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Douglas County, Colorado; Castle Rock Area; 1974.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 60 inches.
Particle-size control section: The zone from 12 to 32 inches. (Bt horizon)
Mollic epipedon: from 0 to 12 inches. (A and BA horizons)
Argillic horizon: from 12 to 32 inches. (Bt horizon)
The 01/2009 revision changes the classification from Aridic Argiustolls to Typic Argiustolls. The classification when established was fine-loamy, mixed Aridic Argiborolls.
National Cooperative Soil Survey
U.S.A.