LOCATION SILVERDOLLAR OR
Tentative Series
Rev. JFD/CEG
02/2025
SILVERDOLLAR SERIES
Landscape--pumice-mantled plateaus
Landform--drainageways, alluvial fans, open depressions, stream terraces, tephra volcanic fields
Slope--0 to 10 percent
Parent material--sandy alluvium derived from coarse pumiceous volcanic ash and pumiceous tephra over loamy alluvium
Mean annual precipitation--about 540 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, glassy, nonacid Typic Cryaquands
TYPICAL PEDON: Silverdollar paragravelly ashy loamy coarse sand, on an open depression on a tephra volcanic field with a slope of 2 percent and an elevation of 1570 m. When described on July 10, 2002, the soil was dry from 0 to 30 cm, moist from 30 to 110 cm and wet below 110 cm.
Oi--0 to 2 cm; slightly decomposed plant material, composed of needles, twigs and cones; abrupt smooth boundary
Oe--2 to 3 cm; moderately decomposed plant material, composed of needles, twigs and cones; abrupt smooth boundary
Oa--3 to 5 cm; highly decomposed plant material, composed of needles, twigs and cones; abrupt smooth boundary
A--5 to 12 cm; paragravelly ashy loamy coarse sand, brown (10YR 5/3) dry, dark brown (7.5YR 3/3) moist; massive; very friable, soft, nonsticky and slightly plastic; many very fine, common fine and medium, and few coarse roots throughout; 20 percent fine pumice paragravel; slightly acid (pH 6.2); abrupt smooth boundary
AB--12 to 30 cm; ashy coarse sand, pale brown (10YR 6/3) dry brown (10YR 4/3) moist; massive; very friable, soft, nonsticky and nonplastic; many very fine, few fine and medium, and few coarse roots throughout; 40 percent medium faint masses of oxidized iron in matrix, yellowish brown (10YR 5/4) dry, not visible moist; 5 percent fine pumice paragravel; slightly acid (pH 6.2); clear smooth boundary
Bw--30 to 90 cm; paragravelly ashy coarse sand, very pale brown (10YR 7/3) dry, brown (10YR 5/3) moist; massive; very friable, soft, nonsticky and nonplastic; many very fine and few fine and medium roots throughout; many fine irregular pores; 40 percent fine to coarse prominent irregular masses of oxidized iron in matrix, strong brown (7.5YR 5/8) dry, strong brown (7.5YR 5/6) moist; 20 percent fine pumice paragravel; slightly acid (pH 6.2); clear smooth boundary
Bc--90 to 110 cm; very paragravelly ashy loamy coarse sand, pale yellow (2.5Y 7/3) dry, light olive brown (2.5Y 5/3) moist; massive; very friable, slightly hard, nonsticky and nonplastic; few very fine, fine, and medium roots throughout; many very fine and common fine irregular pores; 15 percent coarse faint irregular iron depletions in matrix, yellowish brown (10YR 5/8) dry, light gray (2.5Y 7/2) moist; 20 percent medium distinct irregular iron-manganese masses in matrix, brown (7.5YR 5/4) dry, reddish brown (5YR 4/4) moist; 15 percent coarse (5 to 20 mm) prominent irregular weakly to moderately coherent iron-manganese nodules throughout, black (7.5YR 2.5/1) moist; 20 percent fine pumice paragravel; 1 percent andesite cobbles; neutral (pH 6.8); abrupt smooth boundary
2Bcg--110 to 200 cm; loam, pale brown (10YR 6/3) dry, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; friable, slightly hard, slightly sticky and slightly plastic; few fine roots throughout; common very fine and few fine dendritic tubular pores; 5 percent fine prominent moderately coherent manganese masses throughout, black (7.5YR 2.5/1) moist; 30 percent fine distinct irregular masses of oxidized iron in matrix, brown (7.5YR 4/3) moist, and brown (7.5YR 5/4) dry; 7 percent medium and coarse (2 to 20 mm) prominent irregular strongly coherent iron-manganese nodules throughout, black (7.5YR 2.5/1) moist; neutral (pH 6.8)
TYPE LOCATION: Klamath County, Oregon; about 10 miles north and 30 miles east of the town of Chiloquin, Oregon; about 2400 m south and 550 m east of the northwest corner of Section 16, Township 33 S, Range 12 E; Willamette Meridian; Silver Dollar Flat, Oregon U. S. Geological Survey quadrangle; latitude 42.7108000 degrees north, longitude 121.3040000 degrees west, datum WGS 84 (coordinates derived from GPS unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- 5 to 8 degrees C
Mean summer soil temperature-- 9 to 12 degrees C
Mean winter soil temperature-- 3 to 6 degrees C
Soil moisture control section--30 to 90 cm, saturated in some part for 30 to 60 days from April through July; dry or moist in all parts between October and January
Depth to aquic conditions--20 to 50 cm
Depth to lithologic discontinuity (when present)--greater than 100 cm
Particle-size control section
*Clay content--0 to 7 percent
*Pararock fragment content, weighted average--5 to 30 percent fine to medium pumice paragravel
*Rock fragment content, weighted average--0 to 5 percent strongly coherent iron-manganese nodules or indurated andesite gravel or cobbles
Estimated properties (A, AB, Bw, and Bc horizons)
*Glass content--30 to 70 percent in the 0.02 to 2.0 mm fraction
*Acid-oxalate extractable Al+1/2 Fe--0.4 to 1.0 percent
*P-retention--25 to 50
*15-bar water, dry--3 to 12 percent
Oi horizons (where present)
*Thickness--0 to 4 cm
Oe horizons (where present)
*Thickness--0 to 5 cm
Oa horizons (where present)
*Thickness--0 to 3 cm
A horizons
Hue--7.5YR or 10YR dry or moist
Value--5 or 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand
Clay content--1 to 7 percent
Pararock fragment content--15 to 30 percent fine to medium pumice paragravel
Reaction--moderately acid or slightly acid (pH 5.6 to 6.5)
Organic matter content--2 to 10 percent
Thickness--5 to 20 cm
AB horizons
Hue--7.5YR or 10YR dry, 7.5YR, 10YR, or 2.5Y moist
Value--6 or 7 dry, 4 or 5 moist
Chroma--3 or 4 dry, 2 to 6 moist
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand
Clay content--0 to 7 percent
Pararock fragment content--5 to 30 percent fine to medium pumice paragravel
Reaction--moderately acid or slightly acid (pH 5.6 to 6.5)
Organic matter content--0.5 to 4 percent
Thickness--15 to 45 cm
Bw horizons (when present)
Hue--10YR or 2.5Y dry or moist
Value--6 to 8 dry, 4 to 6 moist
Chroma--2 to 4 dry or moist
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand
Clay content--0 to 7 percent
Total fragment content--5 to 30 percent
Pararock fragment content--5 to 30 percent fine to medium pumice paragravel
Rock fragment content--0 to 5 percent andesite gravel or cobbles
Reaction--moderately acid or slightly acid (pH 5.6 to 6.5)
Organic matter content--0.5 to 2 percent
Thickness--0 to 80 cm
Bc horizons
Hue--10YR or 2.5Y dry or moist
Value--6 to 8 dry, 4 to 6 moist
Chroma--2 to 4 dry or moist
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand
Clay content--0 to 7 percent
Total fragment content--10 to 55 percent
Pararock fragment content--5 to 30 percent fine to medium pumice paragravel; 5 to 20 percent fine weakly or moderately coherent iron-manganese nodules
Rock fragment content--0 to 5 percent andesite gravel or cobbles
Reaction--moderately acid to neutral (pH 5.6 to 7.3)
Organic matter content--0.5 to 2 percent
Thickness--50 to 100 cm
2Bcg horizons (or 2Bw or 2Bg horizons, present in some pedons)
Hue--7.5YR or 10YR dry or moist
Value--4 to 8 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Fine-earth texture--loam, clay loam
Clay content--18 to 35 percent
Total fragment content--2 to 20 percent
Pararock fragment content--1 to 10 percent fine weakly or moderately coherent iron-manganese nodules
Rock fragment content--0 to 15 percent andesite gravel, 0 to 5 percent andesite cobbles
Reaction--slightly acid to neutral (pH 6.1 to 7.3)
Organic matter content--0 to 1.0 percent
COMPETING SERIES:
Chock--medial loam surface horizon 12 to 50 cm thick with 15-bar water, dry, of 12 to 20 percent; chroma of 1 or less, moist, in the particle-size control section
Chocknott--umbric epipedon
Tonata--ashy silt loam textures throughout the profile; mollic epipedon
Tutni--greater than 35 percent pumice parafragments in the thickest part of the particle-size control section (note: Tutni currently competes with Silverdollar, but only because Tutni is incorrectly classified as having an ashy particle-size class; the typical pedon classifies as ashy-pumiceous)
GEOGRAPHIC SETTING:
Elevation--1250 to 2375 m
Climate--cold moist winters, cool dry summers
Mean annual air temperature--3 to 7 degrees C
Mean annual precipitation--340 to 1610 mm
Frost-free period--5 to 35 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Lapine--on volcanic fields and ash-mantled lava plains, hills, and cinder cones; formed in coarse pumiceous volcanic ash and pumice parafragments; ashy-pumiceous particle-size class; no redoximorphic features (excessively drained)
Maklak--on pyroclastic flows; formed in coarse pumiceous volcanic ash and pumice parafragments; ashy-pumiceous particle-size class; no redoximorphic features (excessively drained)
Steiger--on ash flows on volcanic fields and lava plains; formed in pumiceous volcanic ash; no redoximorphic features (somewhat excessively drained)
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturated hydraulic conductivity--very high
USE AND VEGETATION:
Use--timber, wildlife habitat, recreation
Vegetation--lodgepole pine, small amounts of ponderosa pine, kinnikinnick, squirreltail, timber oatgrass
DISTRIBUTION AND EXTENT: Cascade Mountains, Eastern Slope, Oregon; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Klamath County, Oregon, 2004
Origin of the name--name derived from USGS topo quad name, Silver Dollar Flat
REMARKS:
Diagnostic horizons and features in this pedon
*Ochric epipedon
*Particle-size control section for this pedon--the zone from 5 to 105 cm
*Andic soil properties--the zone from 4 to 110 cm
*Aquic conditions--the zone from 30 to 200 cm
*Depth to lithologic discontinuity--110 cm (top of 2Bcg horizon)
*Redoximorphic concentrations--the zone from 30 to 200 cm
*Redoximorphic depletions--the zone from 90 to 200 cm
ADDITIONAL DATA:
NASIS Site ID--04-jfd-16
NASIS Pedon ID--04OR683016
Laboratory data from KSSL on one horizon (2Bw2 horizon, 86 to 125 cm) from a similar profile (Silverdollar taxadjunct) sampled in Klamath County, Oregon, July 8, 2002:
*NASIS Site ID--02-jfd-04
*NASIS Pedon ID--02OR035005
*Lab Sample Number: 09N0458, KSSL, Lincoln, NE
National Cooperative Soil Survey
U.S.A.