LOCATION NECANICUM OR+WAEstablished Series
TAXONOMIC CLASS: Medial-skeletal, ferrihydritic, isomesic Typic Fulvudands
TYPICAL PEDON: Necanicum gravelly medial loam, timber. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 2 inches; duff, roots, moss.
A1--2 to 9 inches; dark reddish brown (5YR 3/2) gravelly medial loam, dark reddish gray (5YR 4/2) dry; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic and weakly smeary; many very fine and fine roots; many fine and medium irregular pores; 25 percent gravel; very strongly acid (pH 4.6); gradual smooth boundary.
A2--9 to 14 inches; dark reddish brown (5YR 3/3) very gravelly medial loam, reddish brown (5YR 5/3) dry; moderate fine and medium granular structure; slightly hard, friable, slightly sticky and slightly plastic and weakly smeary; many very fine and fine roots; many fine and medium irregular pores; 35 percent gravel; extremely acid (pH 4.4); clear wavy boundary. (combined A horizon is 3 to 20 inches thick)
Bw1--14 to 22 inches; dark brown (7.5YR 4/4) very gravelly medial loam, brown (7.5YR 5/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic and weakly smeary; many very fine and fine roots; common tubular and medium irregular pores; 30 percent gravel and 10 percent cobbles; very strongly acid (pH 4.6); gradual wavy boundary.
Bw2--22 to 37 inches; dark yellowish brown (10YR 4/4) very gravelly medial loam, light brown (7.5YR 6/4) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic and weakly smeary; common fine roots; common fine tubular pores; 45 percent gravel and 10 percent cobbles; very strongly acid (pH 4.6); gradual wavy boundary. (combined Bw horizon is 9 to 40 inches thick)
BC--37 to 50 inches; yellowish brown (10YR 5/4) extremely cobbly medial loam, light brown (7.5YR 6/4) dry; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic weakly smeary; few fine roots; common medium irregular pores; 50 percent cobbles, 25 percent gravel and 5 percent stones; extremely acid (pH 4.4); gradual wavy boundary. (0 to 25 inches thick)
R--50 inches; fractured basalt.
TYPE LOCATION: In a road cut on 31-35 line, NE1/4 NW1/4 sec. 10, T. 6 N., R. 9 W. south of Youngs River Mainline, Clatsop County, Oregon.
RANGE IN CHARACTERISTICS: The soil is usually moist and dry between the depths of 4 and 12 inches for less than 45 consecutive days following the summer solstice. The mean annual soil temperature is 47 to 52 degrees F. The difference between the mean summer and mean winter soil temperature is 5 to 9 degrees F. Depth to a lithic or paralithic contact is 40 to 60 inches or more. The solum is weakly to moderately smeary and has a moist bulk density of 0.75 to 0.90 g/cubic centimeter. It has acid oxalate aluminum plus one-half iron of 2 to 4 percent, phosphate retention of 90 to 100 percent and over 2 meq. of aluminum per 100 grams of soil. It is extremely acid or very strongly acid. The umbric epipedon, when present, is 10 to 20 inches or more thick; some pedons have an ochric epipedon with moist chromas of 4 above 10 inches.
The A horizon has hue of 10YR, 7.5YR or 5YR, value of 2 or 3 moist and 3 through 5 dry, and chroma of 2 or 3 moist and dry. It has 10 to 20 percent clay by field estimate; 20 to 50 percent gravel, 0 to 10 percent cobbles, and 0 to 5 percent stones. It has 10 to 15 percent organic matter.
The Bw horizon has hue of 10YR, 7.5YR, or 5YR, value of 3 or 4 moist, 4 through 7 dry and chroma of 4 through 6 moist and dry. It has 12 to 27 percent clay by field estimate; it is medial loam or medial silt loam 20 to 60 percent gravel and 0 to 50 percent cobbles. Pararock fragments range from 0 to 25 percent. It has 1 to 10 percent organic matter with less than 7 percent below 20 inches.
The BC horizon, when present, has hue of 10YR, 7.5YR, or 5YR, value of 3 through 5 moist, 4 through 6 dry and chroma of 4 or 6 moist and dry. It is extremely cobbly medial loam or extremely gravelly medial loam. It has 8 to 20 percent clay by field estimate; 0 to 50 percent cobbles, 20 to 80 percent gravel and 0 to 10 percent stones. Pararock fragments range from 0 to 25 percent.
COMPETING SERIES: These are the Ascar, Klone, Mudcreek, Southshore and Traham series. Ascar soils are 20 to 40 inches to bedrock. Klone soils are 40 to 60 inches to a 2C horizon derived from glacial outwash. Traham soils are 24 to 36 inches to bedrock. Mudcreek soils have a densic contact at 20 to 40 inches. Southshore soils are 40 to 60 inches deep to cemented till.
GEOGRAPHIC SETTING: Necanicum soils are on mountains at elevations of 50 to 1800 feet. Slopes are 0 to 90 percent. The soils formed in mixed colluvium from basalt. The climate is characterized by cool wet winters and cool moist summers. The mean annual precipitation is 70 to 170 inches. The mean annual temperature is 44 to 52 degrees F. The frost-free period is 100 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Ascar and the Ecola, Klootchie, Skipanon and Templeton soils. Ecola soils are 20 to 40 inches deep to bedrock. Ecola and Templeton soils are fine-silty. Klootchie soils are medial. Skipanon soils are fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; permeability is moderate.
USE AND VEGETATION: These soils are used mainly for timber. Native vegetation is western hemlock, Sitka spruce, Douglas fir, western redcedar, red alder, salmonberry, red huckleberry, false huckleberry, red elderberry, cascade Oregongrape, salal and western swordfern.
DISTRIBUTION AND EXTENT: These soils occur in the fog belt areas along the northern part of the Coast Range, Oregon and Washington; MLRA 1. They are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clatsop County, Oregon; 1984.
ADDITIONAL DATA: Lincoln Laboratory Reference Samples 82T7125 and 7126.
REMARKS: Diagnostic horizons and features of this pedon include:
Umbric epipedon - from the 2 to 14 inches (A1 and A2 horizon).
Cambic horizon - from 14 to 37 inches (Bw1 and Bw2 horizon).
The series allows for ochric epipedons with the series range.
Fulvic feature - from 0 to 12 inches having value of 3 and chroma of 2 or 3, with a weighted average of 6 percent or more organic carbon (A1 and A2 horizons).
Medial-skeletal - from 0 to 50 inches (A1, A2, Bw1, Bw2, and BC horizons).
All depths to diagnostic horizons and features are measured from the top of the first mineral horizon.