LOCATION LADERLY OREstablished Series
TAXONOMIC CLASS: Medial-skeletal, ferrihydritic, frigid Alic Hapludands
TYPICAL PEDON: Laderly very gravelly medial loam, woodland. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; partially decomposed needles, leaves, roots, and twigs.
A1--1 to 4 inches; very dark brown (7.5YR 2.5/2) very gravelly medial loam, dark brown (10YR 3/3) dry; moderate very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine roots; many very fine irregular pores; 40 percent gravel; very strongly acid (pH 4.8); clear wavy boundary.
A2--4 to 7 inches; dark brown (7.5YR 3/2) very gravelly medial loam, brown (10YR 4/3) dry; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common very fine and few coarse roots; many very fine irregular pores; 35 percent gravel; very strongly acid (pH 4.6); clear wavy boundary. ( Combined thickness of the A horizon is 4 to 14 inches)
AB--7 to 17 inches; dark brown (7.5YR 3/3) gravelly medial loam, brown (10YR 5/3) dry; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common fine and medium and few coarse roots; many very fine irregular pores; 30 percent gravel; very strongly acid (pH 4.6); gradual wavy boundary. (0 to 11 inches thick)
Bw1--17 to 22 inches; dark brown (7.5YR 3/4) very gravelly medial loam, brown (7.5YR 5/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common fine and medium roots; many very fine irregular pores; 40 percent gravel; very strongly acid (pH 4.6); clear wavy boundary. (4 to 15 inches thick)
Bw2--22 to 38 inches; dark brown (7.5YR 3/4) extremely cobbly medial loam, brown (7.5YR 5/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few medium and coarse roots; many very fine irregular pores; 25 percent gravel, 40 percent cobbles and 10 percent stones; very strongly acid (pH 4.6); gradual wavy boundary. (8 to 18 inches thick)
R--38 inches; fractured basalt.
TYPE LOCATION: Clatsop County, Oregon; about 0.6 miles south on military road from junction with Green Mountain road, about 100 feet northwest of road in the SE1/4 SE1/4 NW1/4 section 34, T. 5 N., R. 6 W., W.M.; Sunset Spring, OR USGS 7.5 minute quadrangle; NAD 1927.
RANGE IN CHARACTERISTICS: The soil is usually moist and is dry between the depths of 4 and 12 inches less than 45 consecutive days in the four month period following the summer solstice in most years. The mean annual soil temperature is 42 to 47 degrees F. and the mean summer soil temperature is above 47 degrees F. with an O horizon present. The solum has hue of 10YR to 5YR. The particle-size control section has moist bulk density of 0.75 to 0.90 g/cubic centimeter. It is estimated to have greater than 85 percent phosphate retention, 2.0 to 4.0 acid-oxalate extractable aluminum plus one-half iron, 2 to 15 cmol/kg of KCL extractable aluminum, and 15 to 30 percent 15-bar moisture (air-dried). It is weakly or moderately smeary. Depth to bedrock is 20 to 40 inches. The umbric epipedon is 10 to 20 inches thick. The particle-size control section has 15 to 27 percent clay content by field estimate, and averages 35 to 85 percent rock fragments.
The A horizon has value of 2 or 3 moist, 3 to 5 dry and chroma of 2 or 3 moist and 3 dry. Texture is a gravelly medial loam or very gravelly medial loam with 12 to 20 percent clay content by field estimate. It has 20 to 50 percent gravel and 0 to 10 percent cobbles. It has 5 to 12 percent organic matter. Reaction is strongly or very strongly acid.
The Bw horizon has value of 3 or 4 moist, 4 to 6 dry and chroma of 4 to 6 moist or dry. Texture is very gravelly medial loam, very cobbly medial loam, extremely gravelly medial loam, or extremely cobbly medial loam with 15 to 27 percent clay content by field estimate. It has 20 to 60 percent gravel, 0 to 50 percent cobbles and 0 to 15 percent stones. Reaction is strongly to extremely acid.
COMPETING SERIES: These are the Caterl, McGravey, and Sawpeak series. Caterl soils are over 40 inches deep to bedrock contact. McGravey soils have an ochric epipedon and are over 60 inches deep to bedrock contact. Sawpeak soils have an ochric epipedon and the particle-size control section contains 60 to 90 percent total rock fragments.
GEOGRAPHIC SETTING: Laderly soils occur on summits, shoulder slopes, and back slopes of mountains. Elevations are 1,500 to 3,000 feet. Slopes are 3 to 90 percent. The soils formed in loamy colluvium weathered from basalt and other igneous and volcanic rock types. The climate is characterized by cool, wet winters and warm, moist summers. The mean annual precipitation is 70 to 200 inches. The mean annual temperature is 41 to 46 degrees F. The frost-free period is 60 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Giveout, Murtip, Romanose, and the competing Caterl soils. These soils occur on mountains. Giveout and Murtip soils have less than 35 percent rock fragments in the particle-size control section. Giveout soils are 20 to 40 inches deep to a paralithic contact. Murtip soils are 40 to 60 inches deep to a paralithic contact. Romanose soils are 10 to 20 inches to a lithic contact. Caterl soils are 40 to 60 inches or more deep to a lithic contact.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used for timber production, recreation, wildlife habitat and watersheds. Native vegetation includes Douglas fir, western hemlock, red alder, red huckleberry, salmonberry, vine maple, western swordfern, salal, cascade Oregongrape, Pacific trillium, and Oregon oxalis. Scattered amounts of noble fir, Pacific silver fir, and tall blue huckleberry occur in some areas at the higher elevations within the frigid zone.
DISTRIBUTION AND EXTENT: Mountainous areas of the Coast Range in Oregon; MLRA 1. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clatsop County, Oregon; 1984.
REMARKS: Diagnostic horizons and features in this pedon include:
Umbric epipedon - from 1 to 17 inches (A1, A2, and AB horizons).
Cambic horizon - from 17 to 38 inches (Bw1 and Bw2 horizons).
Particle-size control section - from 1 to 38 inches
Medial-skeletal feature - from 1 to 38 inches dominated by andic soil properties and based on lab data from associated similar soils, and containing greater than 35 percent rock fragments by volume.
Depth to diagnostic horizons and features are measured from the top of the first mineral layer.
Classification revised 8/01 from medial-skeletal, ferrihydritic frigid Alic Fulvudands to medial skeletal, ferrihydritic frigid Alic Hapludands.