LOCATION ROMAN IDEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed Andic Dystrocryepts
TYPICAL PEDON: Roman extremely bouldery medial loam, open-burned, woodland; on a southwest-facing slope of 38 percent at 5,280 feet elevation. When described on June 27, 1994, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 0.5 inch; moss, needles, leaves, twigs, mixed with wood ash, Mt. St. Helen's volcanic ash, and charcoal. (0.5 to 1 inch thick)
Oe--0.5 to 1 inch; decomposed organic matter mixed with Mt. St. Helen's volcanic ash. (0.5 to 1 inch thick)
A--1 to 3 inches; grayish brown (10YR 5/2) medial loam, very dark grayish brown (10YR 3/2) moist; weak very fine subangular blocky structure parting to weak very fine granular; soft, very friable, nonsticky and slightly plastic; many very fine, few fine and medium roots; many very fine tubular pores; 5 percent gravel; slightly acid (pH 6.4); abrupt wavy boundary. (1 to 2 inches thick)
Bw1--3 to 6 inches; yellowish brown (10YR 5/4) cobbly medial loam, dark yellowish brown (10YR 3/4) moist; weak very fine and fine subangular blocky structure parting to weak very fine granular; soft, very friable, nonsticky and slightly plastic; many very fine, few fine and medium roots; many very fine tubular pores; 5 percent gravel, 10 percent cobbles; slightly acid (pH 6.4); clear wavy boundary. (3 to 6 inches thick)
Bw2--6 to 12 inches; light yellowish brown (10YR 6/4) cobbly medial loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, few fine and medium roots; many very fine tubular pores; 5 percent gravel, 15 percent cobbles, and 5 percent stones; slightly acid (pH 6.4); clear wavy boundary. (3 to 6 inches thick)
2Bw3--12 to 25 inches; yellow (2.5Y 7/6) very cobbly sandy loam, light olive brown (2.5Y 5/6) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine and medium roots; many very fine, few fine irregular pores; few fine faint iron stains that are dark yellowish brown (10YR 4/6) moist; few fine mica flakes; 10 percent gravel, 30 percent cobbles, and 15 percent stones; slightly acid (pH 6.2); gradual wavy boundary. (8 to 14 inches thick)
2BC--25 to 31 inches; pale yellow (2.5Y 7/4) very cobbly loamy sand, light olive brown (2.5Y 5/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine, fine, and medium roots; common very fine irregular pores; many very fine mica flakes; 20 percent gravel, 10 percent cobbles, and 5 percent stones; slightly acid (pH 6.2); clear wavy boundary. (0 to 6 inches thick)
2C1--31 to 44 inches; mixed light gray (2.5Y 7/2) and pale yellow (2.5Y 7/3) very cobbly loamy sand, mixed grayish brown (2.5Y 5/2) and light olive brown (2.5Y 5/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; common very fine irregular pores; many very fine mica flakes; 25 percent gravel, 10 percent cobbles, and 5 percent stones; slightly acid (pH 6.2); clear wavy boundary. (9 to 15 inches thick)
2C2--44 to 60 inches; mixed light gray (2.5Y 7/2) and yellow (2.5Y 7/6) very cobbly sand, mixed grayish brown (2.5Y 5/2) and light olive brown (2.5Y 5/6) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; common very fine irregular pores; few fine faint iron stains that are yellowish brown (10YR 5/6) moist; many very fine mica flakes; 30 percent gravel, 30 percent cobbles; moderately acid (pH 6.0).
TYPE LOCATION: Boundary County, Idaho; about 7.5 miles northwest of Naples, about 2,150 feet south and 750 feet east of the northwest corner of sec. 13, T. 61 N., R. 2 W; Latitude - 48 degrees, 38 minutes, 23 seconds North; Longitude - 116 degrees, 33 minutes, 03 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 39 to 43 degrees F.
Average summer soil temperature - 54 to 58 degrees F. without an O horizon
Moisture control section - dry mid August to September (15 to 30 days), moist mid September through July
Surface stones and boulders - 0.01 to 15.0 percent
Depth to sandy-skeletal material - 17 to 25 inches
Volcanic ash mantle - 8 to 13 inches thick
Volcanic glass content - 30 to 65 percent
Acid-oxalate extr. Al + 1/2 Fe - 1.0 to 3.0 percent
Phosphate retention - 55 to 90 percent
Reaction - moderately acid or slightly acid throughout
A horizon
Value - 4 to 6 dry, 2 to 4 moist
Chroma - 2 or 3 dry or moist
Texture - medial-loam, medial silt loam, gravelly medial loam
Clay content - 3 to 10 percent
Cobble content - 0 to 15 percent
Gravel content - 5 to 25 percent
Bulk density - 0.65 to 1.00 grams per cubic centimeter
Bw horizons
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 or 6 dry or moist
Texture - CB-L, GR-L, GR-SIL, L, SIL (all medial)
Clay content - 3 to 10 percent
Gravel content - 5 to 25 percent
Cobble content - 0 to 15 percent
Stone and Boulder content - 0 to 10 percent
Bulk density - 0.65 to 1.00 grams per cubic centimeter
2Bw3 horizon
Hue - 2.5Y or 10YR
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 to 6 dry or moist
Texture - CBV-SL, GRV-SL, GR-SL, CB-SL, STV-SL
Clay content - 3 to 10 percent
Gravel content - 10 to 30 percent
Cobble content - 5 to 35 percent
Stone and boulder content - 0 to 20 percent
2BC horizon
Hue - 2.5Y or 10YR
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 3 to 6 dry or moist
Texture - GRV-LS, CBV-LS
Clay content - 0 to 5 percent
Gravel content - 15 to 30 percent
Cobble content - 5 to 20 percent
Stone and Boulder content - 0 to 10 percent
2C horizons
Hue - 10YR, 2.5Y, variegated
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 2 to 6 dry or moist
Texture - GRV-LS, CBV-S, CBV-COS, GRV-COS, GRX-COS, CBX-COS, STX-LS, BYX-LCOS, STX-COS, CBV-LS
Clay content - 0 to 5 percent
Gravel content - 20 to 35 percent
Cobble content - 10 to 30 percent
Stone and Boulder content - 0 to 30 percent
COMPETING SERIES: This is the Lolopeak series. Lolopeak soils are ashy in the volcanic ash mantle.
GEOGRAPHIC SETTING: Roman soils are on mountains, footslopes, and ridgetops. Slopes range from 5 to 65 percent. They formed in glacial till derived from granite, gneiss, and schist rocks with a thin mantle of volcanic ash. Elevations range from 4,800 to 6,000 feet. The climate is cold, with cool moist summers and cold wet winters. The average annual air temperature is 38 to 42 degrees F. and average annual precipitation is 45 to 55 inches. The average frost-free period is 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Redraven and Rubycreek (T) soils. Redraven soils are on north-facing mountains and have a thick volcanic ash mantle. Rubycreek soils are on similar landscape positions and are loamy-skeletal in the control section.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; permeability is moderate and moderately rapid in the upper part and rapid to very rapid below.
USE AND VEGETATION: These soils are used for woodland, wildlife habitat, recreation, and watershed. Potential natural vegetation is mainly subalpine fir, Engelmann spruce, whitebark pine, western larch, and lodgepole pine, with an understory of common beargrass, big blueberry, Utah honeysuckle, myrtle pachystima, common yarrow, and pearly everlasting.
DISTRIBUTION AND EXTENT: Northern Idaho, and possibly northwestern Montana, and northeastern Washington. This series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Boundary County, Idaho, 2002.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the mineral soil surface to 7 inches (A, Bw1 and part of Bw2 horizons)
Cambic horizon - the zone from 3 to 25 inches (Bw1, Bw2 and 2Bw3 horizons)
Volcanic ash mantle - the zone from 1 to 12 inches (A and Bw1, Bw2 horizons)
Particle-size control section - the zone from 11 to 41 inches (part of the Bw2, 2Bw3, 2BC, and part of the 2C1 horizons)