LOCATION BOGUS CA+OREstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Pachic Ultic Argixerolls
TYPICAL PEDON: Bogus stony loam - on a north facing convex slope of 30 percent under ponderosa pine, Douglas-fir, incense cedar, black oak, deerbrush and Idaho fescue at 4,400 feet elevation. (Colors are for dry soil unless otherwise stated. When described July 31, 1975, the soil was dry above 4 inches and moist below).
O1 and O2--1 inch to 0; new and partially decomposed needles, leaves, twigs, bark and other organic debris.
A11--0 to 3 inches; very dark grayish brown (10YR 3/2) stony loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; 10 percent stones, 2 percent cobbles, 10 percent pebbles slightly acid (pH 6.2); abrupt smooth boundary. (3 to 6 inches thick)
A12--3 to 11 inches; dark grayish brown (10YR 4/2) clay loam, very dark brown (10YR 2/2) moist; strong medium granular structure; hard, friable, sticky and plastic; many very fine, fine, medium and coarse roots; few fine tubular pores; 2 percent cobbles, 5 percent pebbles; slightly acid (pH 6.2); abrupt smooth boundary. (8 to 10 inches thick)
B1t--11 to 20 inches; grayish brown (10YR 5/2) clay loam, dark brown (7.5YR 3/2) moist; strong fine angular blocky structure; very hard, firm, sticky and very plastic; common very fine, fine and many medium and coarse roots; common very fine tubular and fine vesicular pores; few thin clay films on peds and in pores; 10 percent cobbles and 5 percent pebbles; medium acid (pH 6.0); abrupt wavy boundary. (9 to 11 inches thick)
B21t--20 to 29 inches; yellowish brown (10YR 5/4) heavy clay loam, dark yellowish brown (10YR 4/4) moist; strong medium angular blocky structure; extremely hard, very firm, sticky and very plastic; few very fine and fine, and many medium and coarse roots; few very fine tubular pores; few moderately thick clay films on peds and common thin clay films on peds and in pores; 10 percent cobbles and 5 percent pebbles; medium acid (pH 5.8); clear wavy boundary. (7 to 11 inches thick)
B22t--29 to 39 inches; yellowish brown (10YR 5/4 and 5/6) clay, dark yellowish brown (10YR 4/4) moist; strong medium angular blocky structure; extremely hard, very firm, sticky and very plastic; few very fine and fine, and many medium and coarse roots; few very fine tubular pores; few moderately thick clay films on peds and common thin clay films on peds and in pores; 10 percent cobbles and 5 percent pebbles; medium acid (pH 5.8); clear wavy boundary. (7 to 11 inches thick)
B23t--39 to 53 inches; yellowish brown (10YR 5/4) clay, dark brown (10YR 4/3) rubbed, moist; strong medium prismatic structure; extremely hard, very firm, very sticky and very plastic; few very fine and fine, and common medium roots; few very fine tubular pores; appearance of dark yellowish brown (10YR 4.3) continuous thick clay films on peds or pressure faces; common large slickensides; about 10 percent soft saprolitic rock fragments; very strongly acid (pH 4.8); clear wavy boundary. (8 to 15 inches thick)
B3t--53 to 62 inches; yellowish brown (10YR 5/4) sandy clay, yellowish brown (10YR 4/4) ped faces, dark brown (10YR 4/4) rubbed, moist; strong medium angular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine and fine, and common medium roots; few very fine discontinuous tubular pores; appearance of continuous thick clay films on peds or pressure faces; common large slickensides; very strongly acid (pH 5.0). (6 to 15 inches thick
Cr--62 inches; soft weathered tuff.
TYPE LOCATION: Siskiyou County, California; about 14 miles northeast of Montague near Bogus Creek near a dirt road; about 600 feet west and 1,375 feet north of the southeast corner sec. 16, T. 46 N., R. 4 W.
RANGE IN CHARACTERISTICS: The soil is 60 to 80 inches deep to a paralithic contact of weathered tuff. The mean annual soil temperature is 50 to 53 degrees F. The soil temperature exceeds 41 degrees F from April 20 to December 25 and exceeds 47 degrees F from May 5 to November 5. The soil is dry, in most years, between the depth of 4 and 12 inches from mid-July until mid October and is moist in some or all parts the rest of the year. Organic matter is 1.5 to 4 percent to a depth of 20 to 25 inches. The base saturation is assumed to be 50 to 75 percent in some or all parts of the A horizon and upper part of the Bt horizon. There are few to many stones on the surface.
The A horizon is very dark gray, very dark grayish brown, dark brown, dark gray, dark grayish brown or brown (10YR 3/1, 3/2, 3/3, 4/1, 4/2, 4/3; 7.5YR 3/2, 4/2). Moist colors are black, very dark brown, very dark gray, very dark grayish brown, or dark brown (10YR 2/1, 2/2, 3/1, 3/2, 3/3; 7.5YR 3/2). It is clay loam, stony clay loam, very stony clay loam, stony loam, or very stony loam and averages 25 to 35 percent clay. Rock fragments are 0 to 35 percent. It is medium acid or slightly acid.
The B2t horizon has variegated colors and ranges from olive brown to reddish yellow (2.5Y 4/4, 5/4, 5/6, 6/4; 10YR 4/4, 5/4, 5/6, 6/4, 6/6, 7/4; 7.5YR 4/4, 5/4, 5/6, 6/4, 6/6). Moist colors range from olive brown to strong brown (2.5Y 4/4, 4/6, 5/4, 5/6; 10YR 3/4, 4/3, 4/4, 5/3, 5/4, 5/6, 6/3; 7.5YR 4/4, 5/4, 5/6). The variegated colors are dominantly lithochromic from strongly weathered rock fragments. It is heavy clay loam or clay and averages 35 to 60 percent clay. Rock fragments range from 2 to 15 percent in the upper part of the B2t horizon and from 0 to 5 percent in the lower part. It is very strongly acid to medium acid. When the soil dries, cracks from 5mm to 10mm wide are in some parts of the B2t horizon.
The B3 or B3t horizon has the same color and reaction range as the B2t horizon but the content of soft saprolite form the underlying tuff layers ranges from 10 to 35 percent. There are only a very few hard rock fragments or they are lacking. It is sandy clay loam, sandy clay, or clay loam and averages 27 to 40 percent clay.
COMPETING SERIES: These are the Jacket and Bertag, Deter, Medford, Mindego, Pinehurst and Top series in other families. Jacket soils have a large component of loess and a slightly acid to mildly alkaline B2t horizon. Bertag and Top soils have frigid soil temperatures. Deter, Medford and Mindego soils have greater than 75 percent base saturation throughout the upper 30 inches of the soil. Pinehurst soils have a fine-loamy argillic horizon and bedrock at a depth of 40 to 60 inches.
GEOGRAPHIC SETTING: Bogus soils are on uplands at elevations of 3,500 to 5,500 feet. Slopes are 15 to 50 percent. They formed in material weathered from Tertiary volcanic tuff or tuff breccia. There are a few cobbles and stones on the surface. The climate is continental, and subhumid with warm dry summers and cold moist winters. The mean annual precipitation is 18 to 30 inches. Seasonal snowfall is 12 to 36 inches. Mean January temperature is 27 to 33 degrees F; mean July temperature is 63 to 68 degrees F; mean annual temperature is 44 to 49 degrees F. Frost-free season is 60 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Iller, Jenny, Kuck, Lassen, Sheld and the competing Pinehurst soils. Iller and Sheld soils formed in volcanic ash over weathered tuff and have frigid soil temperatures. Jenny and Lassen soils have clay texture with wide cracks to the surface and have slickensides in the A horizon. Kuck soils have some cracks in the A horizon that do not extend to the surface and are underlain by a lithic contact at a depth of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; slow permeability.
USE AND VEGETATION: Used mainly for timber production with limited grazing. Native vegetation is ponderosa pine, Douglas-fir, incense cedar, black and white oak, white fir, deerbrush, serviceberry, needlegrass, Idaho fescue and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Cascade Range in north-central California and possibly south-central Oregon. The soil is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Siskiyou County, California, 1978.
REMARKS:
Last revised by the state on 9/78.