LOCATION BANDON OREstablished Series
TAXONOMIC CLASS: Coarse-loamy, isotic, isomesic, ortstein Typic Haplorthods
TYPICAL PEDON: Bandon sandy loam, on a 5 percent convex west-facing slope in a forested area. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; partially decomposed litter of leaves and needles; moss on surface; smooth boundary. (1 to 3 inches thick)
E--1 to 6 inches; dark grayish brown (10YR 4/2) sandy loam, yellowish brown (10YR 5/4) dry; random dark gray (10YR 4/1) uncoated sand grains, very dark gray (10YR 3/1) dry; black (10YR 2/1) worm casts, very dark gray (10YR 3/1) dry; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine, and common medium and coarse roots; many very fine and fine tubular pores; extremely acid (pH 4.4); abrupt wavy boundary. (3 to 6 inches thick)
Bs1--6 to 13 inches; dark reddish brown (5YR 3/4) sandy loam, reddish brown (5YR 4/4) dry; dark reddish brown (5YR 3/2) stains; dark reddish brown (5YR 3/4) dry; flecks of black (5YR 2/1) charcoal; moderate fine and medium subangular blocky structure; hard, firm (brittle), slightly sticky and nonplastic; common very fine and fine roots; common very fine tubular and few very fine irregular pores; strongly acid (pH 5.2); clear wavy boundary.
Bs2--13 to 23 inches; dark reddish brown (5YR 3/4) loam, reddish brown (5YR 4/4) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine to medium roots; common very fine tubular and few fine irregular pores; contains 5 percent of 2 to 20 millimeter nodules and hardpan fragments; strongly acid (pH 5.4); gradual wavy boundary.
Bs3--23 to 31 inches; dark reddish brown and reddish brown (5YR 3/4, 4/4) loam, brown (7.5YR 4/4) dry; weak medium subangular blocky structure; friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine and fine tubular pores; strongly acid (pH 5.3); clear wavy boundary. (Combined Bs horizons are 15 to 30 inches thick)
Bsm--31 to 44 inches; pale brown (10YR 6/3) cores and strong brown and brown (7.5YR 5/6), 4/4) rinds of cemented sandy material; brown (7.5YR 4/4) material in pores and fractures; massive; extremely firm, nonsticky and nonplastic; few very fine roots; few very fine and fine tubular pores; strongly acid (pH 5.5); abrupt wavy boundary. (12 to 17 inches thick)
C--44 to 60 inches; yellowish brown (10YR 5/6) loam, massive; very friable, slightly sticky and nonplastic; few very fine and fine tubular pores; strongly acid (pH 5.4).
TYPE LOCATION: Coos County, Oregon; 8 miles northeast of Bandon; 900 feet north, 100 feet east of the SW corner of section 22, T. 27 S., R. 14 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 50 to 55 degrees F. The difference between mean summer and mean winter soil temperature varies from 5 to 9 degrees F. The soil has a udic moisture regime, but has a short dry period of less than 45 days during the four-month period following the summer solstice. Depth to the cemented Bsm horizon is 20 to 36 inches. Depth to bedrock is greater than 60 inches. The particle-size control section is sandy loam or loam and averages 5 to 15 percent clay.
The E horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 1 or 2. Mixed A and E colors are typical with a thin A horizon in some pedons. It is fine sandy loam or sandy loam.
The Bs horizon has hue of 5YR or 7.5YR, value of 3 or 4, and chroma of 3 through 6. It is sandy loam or loam and has thin layers in some pedons of 5 to 30 percent fine iron cemented nodules ranging from 2 to 10 millimeters. The Bsm horizon has hue of 5YR through 10YR, value of 4 through 6, and chroma of 3 through 8. It is weakly cemented or strongly cemented.
The C horizon has hue of 7.5YR or 10YR, value of 4 to 6 moist, 6 through 8 dry, and chroma of 2 through 6. It is fine sand through loam. It is usually massive and compacted but is single grained and loose and contains thin (5-15 millimeters) weakly cemented wavy horizontal layers in some pedons; these are strong brown, brown, and light yellowish brown in color.
COMPETING SERIES: There are no competing series. The Bullards and Nelscott soils are in similar families. Bullards soils lack the cemented portion of the spodic horizon. Nelscott soils are fine-loamy.
GEOGRAPHIC SETTING: Bandon soils are on elevated marine terraces at elevations of 25 to 400 feet. Slopes range from 0 to 50 percent. The soils formed in sandy alluvial and eolian deposits on old sand dune and back beach deposits. The climate is characterized by cool wet winters and cool moist summers. The mean annual precipitation is 55 to 90 inches. The mean annual temperature is 50 to 53 degrees F. The frost-free period is about 180 to 300 days. Bandon soils occur on the Pioneer geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Bullards and Nelscott soils and the Blacklock and Depoe soils. Blacklock and Depoe soils are poorly drained and have an ortstein layer at 12 to 20 inches.
DRAINAGE AND PERMEABILITY: Well drained; slow permeability through the cemented horizon.
USE AND VEGETATION: Bandon soils are used primarily for pasture, timber production, crop production (cranberries), homesite development, and wildlife habitat. The natural vegetation is Douglas fir, Port Orford cedar, grand fir, shorepine, Sitka spruce, western hemlock, evergreen huckleberry, salal, Pacific rhododendron, Pacific madrone, red alder, western swordfern, and oxalis.
DISTRIBUTION AND EXTENT: Bandon soils are on the coastal marine terraces in Oregon; MLRA 1. They are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lane County Area, Oregon, 1981.
REMARKS: This draft represents a change in classification from mesic to isomesic Typic Haplorthods.
Diagnostic horizons and features in this pedon include:
Albic horizon - from 1 to 6 inches (E).
Spodic horizon - from 6 to 31 inches underlain by a strongly cemented horizon from 31 to 44 inches that has a sandy matrix.
All diagnostic horizons and features are measured from the to of the first mineral layer.
ADDITIONAL DATA: Characterization data for three pedons (S74 Oreg. 11-1, 11-2, and 11-26) from Coos County; data on computer printout sheets; Lincoln SCS Soil Survey Laboratory.