LOCATION TISHAR OREstablished Series
TAXONOMIC CLASS: Clayey-skeletal, mixed, active, mesic Typic Haploxerults
TYPICAL PEDON: Tishar very gravelly silty clay loam - forested. (Colors are for moist soil unless otherwise noted.)
0i--1 inch to 0; lichens, moss and twigs.
A--0 to 6 inches; dark brown (7.5YR 3/2) gravelly silty clay loam, light brown (7.5YR 6/4) dry; weak fine granular stucture; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium roots; many very fine and medium irregular pores; 20 percent gravel; moderately acid (pH 5.8); clear wavy boundary. (4 to 8 inches thick)
AB--6 to 13 inches; dark brown (7.5YR 4/4) gravelly silty clay loam, light brown (7.5YR 6/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and plastic; many very fine, fine, and medium roots; many very fine to medium tubular pores; 20 percent gravel; strongly acid (pH 5.4); clear wavy boundary. (0 to 8 inches thick)
BAt--13 to 22 inches; yellowish red (5YR 4/6) very gravelly silty clay, pink (7.5YR 7/4) dry; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common fine medium and coarse roots; few very fine tubular pores; common faint clay films on faces of peds; 40 percent gravel, 10 percent cobbles; strongly acid (pH 5.4); gradual smooth boundary. (0 to 10 inches thick)
Bt1--22 to 40 inches; yellowish red (5YR 4/6) very gravelly clay, reddish yellow (5YR 6/6) dry; moderate medium subangular blocky structure; very hard, firm, sticky and plastic; few fine and medium roots; few very fine tubular pores; many distinct clay films on faces of peds; 40 percent gravel, 10 percent cobbles; strongly acid (pH 5.2); gradual smooth boundary. (20 to 30 inches thick)
Bt2--40 to 52 inches; yellowish red (5YR 4/6) very gravelly clay, reddish yellow (7.5YR 6/6) dry; moderate medium subangular blocky structure; very hard, firm, sticky and plastic; few fine roots; few very fine tubular pores; many distinct clay films on faces of peds; 40 percent gravel, 10 percent cobbles; strongly acid (pH 5.2); clear wavy boundary. (10 to 30 inches thick)
Cr--52 inches; weathered and fractured siltstone.
TYPE LOCATION: Douglas County, Oregon; about 9 miles south of Camas Valley; 1,000 feet north and 350 feet west of the SE corner of section 5, T. 31 S., R. 8 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 52 to 57 degrees F. The soils are usually moist and dry for 60 to 80 consecutive days during the 120-period following the summer solstice. The solum thickness and depth to soft bedrock range from 40 to 60 inches.
The A horizon has hue of 7.5YR or 5YR, value of 3 through 5 moist, 6 or 7 dry, and chroma of 2 through 4 moist and dry. It has 20 to 30 percent gravel and 0 to 5 percent cobbles.
The Bt horizon has hue of 7.5YR, 5YR or 2.5YR, value of 4 or 5 moist, 5 through 7 dry, and chroma of 6 through 8 moist or dry. It is very gravelly clay, or very gravelly silty clay, averaging 40 to 50 percent clay. Coarse fragments range from 35 to 50 percent gravel and 0 to 10 percent cobbles.
COMPETING SERIES: This is the McGinnis series in the same family and the Dumont and Pollard series. Dumont and Pollard soils have less than 35 percent rock fragments in the particle-size control section. McGinnis soils are 20 to 40 inches deep to a paralithic contact.
GEOGRAPHIC SETTING: Tishar soils are on footslopes and mountainsides and have slopes of 3 to 80 percent. Elevations range from 600 to 4,000 feet. The soils formed in colluvium and residuum weathered from metasedimentary, metavolcanic and sedimentary rocks. The climate is characterized by cool moist winters and warm dry summers. The mean January temperature is 40 degrees F.; the mean July temperature is 67 degrees F.; the mean annual temperature is 47 to 55 degrees F. The mean annual precipitation is 30 to 60 inches. The frost-free season is 120 to 220 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Beekman, Jory, Kanid, and Vermisa soils, and the competing Pollard and McGinnis soils. Beekman, Kanid, and Vermisa soils are loamy-skeletal. Jory soils have less than 35 percent rock fragments in the particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: Timber production, grazing, wildlife habitat, and watershed. Native vegetation is Douglas fir, incense cedar, ponderosa pine, sugar pine, grand fir, Pacific madrone, salal, cascade Oregongrape, whipplevine, western swordfern, creambush oceanspray, and mountain brome.
DISTRIBUTION AND EXTENT: Southwestern part of Oregon in the Coast Range and Siskiyou Mountains. MLRA 2 and 5. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Douglas County, Oregon, 1995.
REMARKS: The activity class was added to the classification in March of 2003. Competing series were not checked at that time. - ET