LOCATION CHINCHALLO ORTentative Series
TAXONOMIC CLASS: Loamy over ashy or ashy-pumiceous, mixed over glassy, superactive, nonacid Typic Cryaquents
TYPICAL PEDON: Chinchallo mucky silt, meadow. (Colors are for moist soil unless otherwise noted.)
A--0 to 8 inches; black (10YR 2/1) mucky silt, gray (10YR 5/1) dry; weak very thin platy parting to moderate very fine granular structure; friable, slightly sticky and nonplastic; many very fine roots; few very fine tubular pores; moderately acid (pH 5.8); abrupt smooth boundary. (1 to 10 inches thick)
AE--8 to 24 inches; very dark gray (10YR 3/1) diatomaceous silt, gray (10YR 6/1) dry; moderate very thin platy structure; firm, slightly sticky and slightly plastic; common very fine roots; few very fine tubular pores; slightly acid (pH 6.4); abrupt smooth boundary. (5 to 16 inches thick)
Eg1--24 to 32 inches; dark gray (10YR 4/1) diatomaceous silt, light gray (10YR 7/1) dry; common coarse faint gray (N 5/0) redox depletions; moderate very thin platy structure; firm, slightly sticky and slightly plastic; common very fine roots; few very fine tubular pores; neutral (pH 6.6); clear irregular boundary.
Eg2--32 to 38 inches; very pale brown (10YR 7/4) diatomaceous silt, white (10YR 8/1) dry; massive; slightly sticky and slightly plastic; few very fine roots; many very fine pores; neutral (pH 6.6); clear irregular boundary. (Combined thickness of the Eg horizon is 3 to 22 inches)
2C--38 to 60 inches; brown (7.5YR 5/3) very paracobbly ashy coarse sand, pinkish white (7.5YR 8/2) dry; single grain; loose; nonsticky and nonplastic; many very fine pores; 20 percent gravel-size pumice and 20 percent cobble-size pumice fragments; neutral (pH 6.6).
TYPE LOCATION: Klamath County, Oregon; southeast corner of SE1/4 NW1/4 section 17, T. 32 S., R. 8 E.; about 3 miles southwest of Little Wocus Bay on the Klamath Marsh.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 35 to 40 degrees F., mean summer soil temperature is 40 to 45 degrees F. and the mean winter soil temperature is 32 to 35 degrees F. The soils are wet throughout in spring and early summer. Depth to pumice and ash ranges from 20 to 40 inches. The silty upper part of the control section has estimated bulk density of 0.4 to 0.6 gm/cc and is diatomaceous earth. The ashy lower part has 10 to 25 percent phosphate retention, 0.2 to 0.4 percent acid oxalate extractable aluminum plus one-half iron, and less than 12 percent 15-bar moisture based on an air-dried sample. It has 50 to 90 percent glass. It is moderately acid to neutral. Some pedons have a thin O horizon up to 4 inches thick.
The A horizon has hue of 10YR or 2.5Y, value of 2 or 3 moist, 3 to 5 dry, and chroma of and 0 or 1 moist and dry. It is mucky diatomaceous silt or diatomaceous silt. The n value is assumed to be less than 0.7. It has 0 to 5 percent field estimated clay. It has 7 to 24 percent organic matter. Base saturation is 20 to 40 percent by ammonium acetate.
The Eg layers have hue of 10YR or 2.5Y, value of 3 through 7 moist, 6 through 8 dry and chroma of 0 through 4 moist and dry. Chroma is less than 2 to depths over 20 inches. The n value is assumed to be less than 0.7. It has 0 to 5 percent field estimated clay. Base saturation; is 20 to 40 percent by ammonium acetate. It has 1 to 3 percent organic matter.
The 2C or 2BC horizon has hue of 2.5Y, neutral, 10YR, 7.5YR and 5YR, value of 4 through 8 moist, 6 through 8 dry, and chroma of 0 through 8 moist, 0 through 3 dry. It is ashy coarse sand, ashy loamy sand, ashy loamy coarse sand, ashy coarse sandy loam or ashy sandy loam with 5 to 60 percent gravel-size pumice and 0 to 30 percent cobble-size pumice. Base saturation is less than 50 percent by ammonium acetate. Redoximorphic features when present consist of common fine black (2.5Y 2/1) manganese nodules and few fine strong brown (7.5YR 4/6) iron and manganese nodules.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Chinchallo soils are on margins of marshes and recent lake bottoms and floodplains at elevations of 4,150 to 5,630 feet. Slopes are 0 to 12 percent. The soils formed in recent diatomaceous sediments overlying pumice and ash from dacitic pumice flows. The climate is characterized by cold moist winters and cool dry summers. The mean annual precipitation is 16 to 32 inches. The mean January temperature is 25 to 26 degrees F., mean July temperature is 57 to 59 degrees F., and mean annual temperature is 41 to 45 degrees F. The frost-free period is 0 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Moyina, Kirk and Yamsey series. Moyina soils lack the ashy-pumiceous layer within the lower part of the particle-size control section and have an umbric epipedon. Kirk soils are ashy-pumiceous. Yamsey soils are comprised of organic soil material and vegetation is dominated by tules.
DRAINAGE AND PERMEABILITY: Poorly or very poorly drained; permeability is very slow in the silty upper part and is rapid through the pumiceous lower part. A water table occurs at 1 foot above to a depth of 3 feet below the surface from January to December.
USE AND VEGETATION: Chinchallo soils are used for pasture, wildlife, and recreation. Native wet meadow plants include tufted hairgrass, Nebraska sedge, widefruit sedge Baltic rush, bluegrass and clover.
DISTRIBUTION AND EXTENT: Marsh areas in colder portions of south-central Oregon; MLRA 6. The soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klamath County Area, Northern Part, Oregon, 1955.
REMARKS: Diagnostic horizons and features recognized in this pedon:
- Ochric epipedon
- Particle-size control section - from 10 to 40 inches and is based on the upper part from 10 to 38 inches being coarse-silty (diatomaceous earth) having a mixed mineralogy and the lower part from 38 inches or more being ashy-pumiceous and being glassy.
- As defined with ashy and pumice at 20 to 40 inches, some pedons will quality as Aquandic.
ADDITIONAL DATA: NSSL pedon id S03OR-035-014. The pedon sampled has color, thickness and base saturation; to qualify as umbric epipedon and a Humic Cryaquepts, with some pedons classifying as Aquandic.