LOCATION IPSOOT                  OR

Established Series
Rev. RPM/TDT
03/2011

IPSOOT SERIES

The Ipsoot series consists of moderately deep to cinders, excessively drained soils that formed in volcanic ash over basaltic cinders. The Ipsoot soils are on cinder cones. Slopes range from 15 to 65 percent. The mean annual temperature is about 42 degrees F and the mean annual precipitation is about 20 inches.

TAXONOMIC CLASS: Ashy over pumiceous or cindery, glassy Xeric Vitricryands

TYPICAL PEDON: Ipsoot very paragravelly ashy loamy coarse sand, on a north-facing, convex, 30 percent slope under conifers at an elevation of 5500 feet. (Colors are for moist soil unless otherwise noted. When described on November 10, 1993, the soil was dry throughout.)

Oi--0 to 1 inch; slightly decomposed plant material consisting of pine needles and litter.

A--1 to 5 inches; dark brown (10YR 3/3) very paragravelly ashy loamy coarse sand, yellowish brown (10YR 5/4) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many fine roots; many fine interstitial pores; 40 percent pumice paragravel; 50 percent sand-size (0.5 - 2.0 mm.) ash, brown (10YR 5/3); neutral (pH 6.8); clear smooth boundary. (3 to 9 inches thick)

AC1--5 to 8 inches; brown (10YR 4/3) very paragravelly ashy loamy coarse sand, yellowish brown (10YR 5/4) dry; weak medium granular structure; soft, very friable, nonsticky and nonplastic; common fine roots; many fine interstitial pores; 40 percent pumice paragravel; 50 percent sand-size (0.5 - 2.0 mm.) ash, brown (10YR 5/3); neutral (pH 6.8); clear smooth boundary. (0 to 10 inches thick)

AC2--8 to 18 inches; brown (10YR 4/3) very paragravelly ashy loamy coarse sand, yellowish brown (10YR 5/4) dry; single grain; loose, nonsticky and nonplastic; few fine roots; many fine interstitial pores; 40 percent pumice paragravel; 70 percent sand-size (0.5 - 2.0 mm.) ash, light gray (10YR 7/2); neutral (pH 6.8); clear wavy boundary. (5 to 12 inches thick)

C--18 to 31 inches; brown (10YR 5/3) ashy coarse sand, pale brown (10YR 6/3) dry; single grain; loose, nonsticky and nonplastic; few fine roots; many fine interstitial pores; 10 percent pumice paragravel; 70 percent sand-size (0.5 - 2.0 mm.) ash, very pale brown (10YR 8/2); neutral (pH 7.0); abrupt smooth boundary. (6 to 15 inches thick)

2C--31 to 61 inches; dark yellowish brown (10YR 3/4) cinders, yellowish brown (10YR 5/4) dry; single grain; few fine roots; many medium vesicular pores; about 90 gravel size and 10 percent cobble size cinders; neutral (pH 7.2).

TYPE LOCATION: Lake County, Oregon; on the Deschutes National Forest about one mile northwest of Green Butte, approximately 1700 feet east and 400 feet north of the southwest corner of section 20, T. 23 S, R. 12 E.; USGS Spring Butte quadrangle; latitude 43 degrees, 33 minutes, 40 seconds north and longitude 121 degrees, 18 minutes, 18 seconds west NAD27.

RANGE IN CHARACTERISTICS: The mean annual soil temperature is 40 to 45 degrees F and the mean summer soil temperature without an O horizon is 52 to 59 degrees F. These soils are usually moist, but are dry in all parts of the moisture control section for 45 to 90 consecutive days within the four months that follow the summer solstice. Depth to bedrock is greater than 60 inches. Depth to basaltic cinders is 20 to 40 inches. Thickness of the zone having andic soil properties is 14 to 25 inches. The upper part (ash mantle) of the particle-size control section contains 70 to 100 percent glass and glass-coated aggregates, phosphate retention of 25 to 50 percent, acid oxalate extractable aluminum plus one-half the acid oxalate iron of 0.4 to 0.9 percent, 15 bar water content of 4 to 7 percent on both dried and undried samples and moist bulk density of 0.75 to 0.90 grams per cubic centimeter. The ash mantle has field estimated clay content of 0 to 5 percent. The upper part of the particle-size control section contains 20 to 35 percent pumice paragravel fragments and the lower part contains 90 percent or more gravel and cobble size basaltic cinders. Reaction is neutral throughout.

The A and AC horizons have value of 3 or 4 moist and 5 or 6 dry. Chroma is 2 through 4 moist and dry. It contains 35 to 50 percent pumice paragravel and 40 to 70 percent sand-size (0.5 - 2.0 mm.) ash.

The C horizon has value of 4 through 8 moist, 6 through 8 dry and chroma of 1 through 4 moist and dry. It is ashy coarse sand, paragravelly ashy coarse sand, very paragravelly ashy coarse sand and very paragravelly ashy loamy coarse sand. It contains 5 to 45 percent pumice paragravel. It contains 60 to 90 percent sand-size (0.5 - 2.0 mm.) ash.

The 2C horizon has hue of 10YR and 7.5YR. It has value of 3 or 4 moist, 5 through 7 dry, with chroma of 3 or 4 moist and dry. It contains 90 to 100 percent gravel and cobble size cinders of which 50 to 90 percent are gravel size and 10 to 50 percent are cobble size.

COMPETING SERIES: This is the Kweo series. The Kweo soils have a particle-size control section that contains 5 to 15 percent field-estimated clay in the ash mantle.

GEOGRAPHIC SETTING: Ipsoot soils are on cinder cones and have slopes of 15 to 65 percent. The soils formed in volcanic ash over basaltic cinders. Elevations are 4,550 to 6,230 feet. The climate is characterized by cold, wet winters and cool, dry summers. The mean annual precipitation is 15 to 35 inches. The mean annual temperature is 39 to 43 degrees F. The frost-free period is 10 to 50 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Shukash and Shanahan soils. Shukash soils are on surrounding lava plains and are ashy over loamy-skeletal. Shanahan soils are on surrounding lava plains and are ashy over loamy.

DRAINAGE AND PERMEABILITY: Excessively drained; very rapid permeability

USE AND VEGETATION: These soils are used for timber production and wildlife habitat. Potential native vegetation is dominated by ponderosa pine, sugar pine, antelope bitterbrush, greenleaf manzanita, snowbrush, and western needlegrass.

DISTRIBUTION AND EXTENT: Cinder cones of south-central Oregon; MLRA 6. Series is of limited extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Lake County, Oregon, Northern Part, 2006.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - The zone from the soil surface to 5 inches (Oi and A horizons). Color is strongly contrasting within the fine earth fraction. Soil material less than 0.5 millimeters in size has mollic colors and material greater than or equal to 0.5 millimeters in size has high values and high chroma.

Andic soil properties - from a depth of 1 to 18 inches (A and AC horizons). Data for andic soil properties are from S87OR-035-001 (Steiger Series).

Particle-size control section - The upper part (1 to 31 inches) averages 27 percent pumice paragravel fragments and the lower part (31 to 41 inches) contains over 90 percent gravel and cobble size basaltic cinders.

Ash deposit is from Mt. Mazama.

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National Cooperative Soil Survey
U.S.A.