LOCATION PROVIG OREstablished Series
TAXONOMIC CLASS: Clayey-skeletal, smectitic, mesic Typic Argixerolls
TYPICAL PEDON: Provig very gravelly loam, rangeland. (Colors are for moist soil unless otherwise noted.)
O--1 to 0 inch; duff layer of leaves.
A1--0 to 3 inches; very dark brown (10YR 2/2) very gravelly loam, very dark grayish brown (10YR 3/2) dry; moderate fine subangular blocky structure parting to moderate very fine granular; soft, very friable, slightly sticky and nonplastic; many fine and very fine roots; many irregular pores; 35 percent gravel; slightly acid (pH 6.1); clear smooth boundary. (2 to 5 inches thick)
A2--3 to 9 inches; very dark grayish brown (10YR 3/2) very gravelly loam, dark grayish brown (10YR 4/2) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few roots; many very fine tubular pores; 50 percent gravel and 5 percent cobbles; neutral (pH 6.6); clear smooth boundary. (4 to 8 inches thick)
Bt--9 to 15 inches; dark brown (7.5YR 3/2) very gravelly clay loam, dark brown (10YR 3/3) crushed, brown (7.5YR 4/2) dry; moderate fine subangular blocky structure; hard, friable, sticky and plastic; many very fine tubular pores; common moderately thick clay films on peds and in pores; common clay bridges; 45 percent gravel and 5 percent cobbles; neutral (pH 6.6); abrupt smooth boundary. (6 to 8 inches thick)
2C--15 to 60 inches; variegated dark reddish brown (5YR 3/3) and
(5YR 3/4) and reddish brown (5YR 4/4) and (5YR 5/4) extremely gravelly clay with lenses of coarser texture; massive; very hard, firm, very sticky and very plastic; common black stains; 70 percent gravel and 5 percent cobbles; neutral (pH 6.8).
TYPE LOCATION: Jackson County, Oregon; 3 1/2 miles north of Central Point, approximately 2,000 feet west and 2,320 feet north of the southeast corner of sec. 21, T. 36 S., R. 2 W., Willamette Meridian.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry throughout between 4 and 12 inches for 80 to 110 consecutive days during the summer. The mean annual soil temperature ranges from 54 to 56 degrees F. Depth to bedrock is more than 60 inches. Solum thickness ranges from 14 to 20 inches. Rock fragments in the control section average 35 to 60 percent, of which 30 to 45 percent are gravel and 5 to 15 percent are cobbles. It is slightly acid or neutral.
The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist and 3 or 4 dry and chroma of 2 or 3 moist and dry.
The Bt horizon has value of 3 moist and 4 or 5 dry and chroma of 2 or 3 moist and dry. It is very gravelly clay loam or very gravelly clay with 35 to 45 percent clay.
The 2C horizon has variegated colors and stratified textures from extremely gravelly clay to extremely gravelly sandy loam. Rock fragments range from 55 to 70 percent gravel and 5 to 20 percent cobbles.
COMPETING SERIES: These are the Hiibner and Immig series. Hiibner soils have sola 45 to 60 inches or more thick and have a mean annual soil temperature of 48 to 52 degrees F. Immig soils are 20 to 40 inches to a lithic contact.
GEOGRAPHIC SETTING: Provig soils are on dissected fan terraces. Elevations range from 1,100 to 1,750 feet. Slopes range from 3 to 35 percent. The soils are formed in poorly sorted gravelly old stream alluvium. The summers are hot and dry and the winters warm and wet. The mean annual precipitation ranges from 18 to 30 inches. The mean annual temperature is 52 to 54 degrees F. The frost-free period is 150 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agate and Winlo soils. Both these soils have duripans. Winlo soils are somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; runoff is medium; permeability is slow.
USE AND VEGETATION: This soil is used for homesites, grazing and wildlife habitat. The native vegetation commonly consists of ponderosa pine, Oregon white oak, California black oak, Idaho fescue, bluebunch wheatgrass, and prairie junegrass.
DISTRIBUTION AND EXTENT: Rogue and Bear Creek Valleys in Jackson County, Oregon. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Jackson County Area, Oregon, 1988.
ADDITIONAL DATA: Oregon State University; profile number 72 Oreg. 15-2.