LOCATION GREENPETER OR
Tentative Series
DCR/KMS
01/2017
GREENPETER SERIES
Landscape--western Cascade Mountains
Landform--bars on flood plains
Slope--0 to 8 percent
Parent material--alluvium
Depth class--very deep
Drainage class--somewhat excessively drained
Mean annual precipitation--about 1700 mm
Mean annual air temperature--about 9 degrees C
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Mollic Udifluvents
TYPICAL PEDON: Greenpeter gravelly loam under deciduous forest on a 2-percent slope at an elevation of 560 m (The soil was slightly moist throughout when described on June 6, 2016.)
Oi--0 to 2 cm; slightly decomposed plant material; abrupt wavy boundary
Oe--2 to 12 cm; moderately decomposed plant material, dark brown (10YR 3/3) dry, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; many very fine and common fine to coarse roots; many very fine interstitial pores; 4 percent gravel, 2 percent cobbles, and 1 percent stones; very strongly acid (pH 4.6); clear wavy boundary
A--12 to 28 cm; gravelly loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine subangular blocky structure parting to weak very fine granular; soft, very friable, slightly sticky and slightly plastic; common very fine, medium, coarse, and very coarse roots; many very fine interstitial pores and few fine tubular pores; 25 percent gravel, 5 percent cobbles, and 1 percent stones; strongly acid (pH 5.2); abrupt wavy boundary
C1--28 to 60 cm; very gravelly coarse sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; common very fine and medium and few fine and coarse roots; many very fine interstitial pores; 35 percent gravel, 8 percent cobbles, and 2 percent stones; strongly acid (pH 5.4); clear wavy boundary
C2--60 to 150 cm; extremely cobbly coarse sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; few very fine and medium roots; many very fine interstitial pores; 30 percent gravel, 25 percent cobbles, and 10 percent stones; strongly acid (pH 5.4)
TYPE LOCATION: Linn County, Oregon, 5 km southeast of Detroit Reservoir; 270 m south and 20 m west of the northeast corner of section 1, T. 11 S., R. 5 E.; Detroit, Oregon, U.S. Geological Survey 7.5-minute quadrangle; latitude 44.6525700, longitude -122.1340840, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Dry days--fewer than 45 consecutive days following summer solstice
Mean annual soil temperature--8 to 10 degrees C
Depth to sandy-skeletal material--15 to 24 cm below mineral soil surface
Reaction--5.1 to 6.0 throughout all mineral horizons
Particle-size control section
*Clay content--0 to 5 percent
*Total fragment content--35 to 90 percent
O horizon
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Cobble content--0 to 5 percent
*Stone content--0 to 5 percent
*Thickness--2 to 15 cm
A horizon
*Hue--10YR, 7.5YR
*Value--2 or 3 moist, 4 or 5 dry
*Chroma--2 or 3 moist or dry
*Clay content--18 to 27 percent
*Sand content--30 to 50 percent
*Total fragment content--15 to 35 percent
*Gravel content--10 to 35 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 5 percent
*Thickness--15 to 24 cm
C horizon
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--coarse sand, loamy coarse sand
*Clay content--0 to 5 percent
*Sand content--75 to 95 percent
*Total fragment content--35 to 90 percent
*Gravel content--20 to 50 percent
*Cobble content--5 to 40 percent
*Stone content--0 to 20 percent
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--200 to 700 m
Climate--warm, dry summers; cool, wet winters
Mean annual precipitation--1500 to 1900 mm
Mean annual air temperature--8 to 11 degrees C
Frost-free period--120 to 165 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Haflinger--umbric epipedon; on low terraces
Jimbo--greater than 100 cm deep to sandy-skeletal material; on stream terraces
Manlywham--water table at soil surface more than 30 consecutive days in normal years; frigid soil temperature regime; on flood plains and in depressions
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturation in normal years--none
Flooding--rare
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in epipedon, very high below
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--red alder, bigleaf maple, vine maple, Indian plum, youth on age, arctic sweet coltsfoot, bedstraw, Siberian springbeauty, false Solomon's seal; commonly supports a red alder/piggyback plant-Siberian miner's lettuce community
DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; 2016; name from local landmark
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 37 to 112 cm
*Ochric epipedon
9/2016--This series meets criteria 3b for the Fluvents suborder. It has an irregular decrease in organic carbon content (Holocene age) between depths of 25 and 125 cm below the mineral soil surface.
ADDITIONAL DATA: Type location user site ID--2016OR043761
National Cooperative Soil Survey
U.S.A.