LOCATION LARMINE OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Lithic Haploxerepts
TYPICAL PEDON: Larmine gravelly loam, forested. (Colors are for moist soil unless otherwise noted.)
A--0 to 3 inches; dark grayish brown (10YR 4/2) gravelly loam, light brownish gray (10YR 6/2) dry; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium roots; many very fine tubular and irregular pores; 30 percent fine gravel; slightly acid (pH 6.4); clear wavy boundary. (3 to 5 inches thick)
Bw1--3 to 12 inches; yellowish brown (10YR 5/4) very gravelly loam, very pale brown (10YR 7/3) dry; weak medium and coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine to medium roots; many very fine to medium tubular pores; 45 percent gravel and 10 percent cobbles; moderately acid (pH 5.6); clear wavy boundary. (7 to 12 inches thick)
Bw2--12 to 19 inches; yellowish brown (10YR 5/4) extremely gravelly loam, very pale brown (10YR 7/4) dry; weak medium granular structure; hard, friable, slightly sticky and slightly plastic; common very fine, medium and coarse roots; common very fine to medium irregular pores; 50 percent gravel and 20 percent cobbles; neutral (pH 6.6); gradual wavy boundary. (0 to 7 inches thick)
R--19 inches; fractured sandstone,
TYPE LOCATION: Douglas County, Oregon; about 6 miles north of the community of Umpqua on Blm road 29.0; 2,625 feet north and 560 feet west of the southeast corner of section 25, T. 24 S., R. 7 W.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry from 45 to 60 days during the summer. The mean annual soil temperature ranges from 52 to 57 degrees F. Depth to hard bedrock is 10 to 20 inches.
The A horizon has value of 3 to 5 moist, 6 or 7 dry and chroma of 2 to 4 moist and dry. Rock fragments range from 15 to 30 percent gravel and 0 to 5 percent cobbles.
The B horizon has hue of 7.5YR or 10YR, value of 4 or 5 moist, 6 or 7 dry and chroma of 3 to 6 moist and dry. It is loam or silt loam and has 10 to 18 percent clay. Rock fragments range from 30 to 50 percent gravel and 5 to 25 percent cobbles.
The bedrock is massive to fractured sandstone and siltstone.
COMPETING SERIES: These are the Goulding and Vermisa series. Goulding soils have 20 to 30 percent clay in the B horizon and contains more than 50 percent coarse and very coarse sand and the clay is dominated by kaolinite and vermiculite. The Vermisa soils have 18 to 27 percent clay in the B horizon and are dry in the soil moisture control section for 60 to 80 days. Vermisa soils are derived from metavolcanic rocks.
GEOGRAPHIC SETTING: Larmine soils are on very narrow ridgetops, steep sideslopes and headwalls in mountainous areas. They have slopes of 12 to 90 percent. Elevations range from 250 to 3,000 feet. The soils formed in colluvium weathered from sandstone and siltstone of the Tyee, Flournoy and Lookingglass formations. The climate is characterized by cool moist winters and dry warm summers with precipitation ranging from 30 to 60 inches. Mean January temperature is 39 degrees F., the mean July temperature is 66 degrees F., and the average temperature is 50 to 55 degrees F. The frost-free season is about 160 to 235 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Atring, Bateman, Bellpine, Kanid, Rosehaven and Windygap series. Atring soils are 20 to 40 inches deep to a paralithic contact. Bateman, Bellpine and Windygap soils have a fine textured argillic horizon. Kanid soils are greater than 40 inches to a paralithic contact and average greater than 18 percent clay in the control section. Rosehaven soils are fine-loamy and are 40 to 60 inches deep to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Timber production some grazing, wildlife and watershed. Natural vegetation is Douglas-fir, Oregon white oak, western swordfern and tall Oregon-grape.
DISTRIBUTION AND EXTENT: Eastern side of the Coast Range in northern Douglas County, Oregon. MLRA 2. The series is moderately extentive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Douglas County, Oregon, 1994.