LOCATION SCIDMORE AK
Established Series
IRD. NDP/SCD
02/2022
SCIDMORE SERIES
Landscape--mountain valleys
Landform--pitted outwash plains
Slope--0 to 10 percent
Parent material--outwash
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--moderately well drained, well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Sandy, mixed Aquic Haplocryepts
TYPICAL PEDON: Scidmore sandy loam, forested, on a pitted outwash plain, on a slope of 1 percent at an elevation of 23 m (When described on August 7, 2013, the soil was moist from the surface layer to a depth of 50 cm and wet from a depth of 50 to 150 cm.)
Oe--0 to 3 cm; moderately decomposed plant material; moderately acid (pH 5.6); abrupt wavy boundary
A--3 to 9 cm; sandy loam, gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, coarse, and very coarse and many medium roots throughout; common very fine and fine irregular pores ; 5 percent rounded gravel; noneffervescent; neutral (pH 6.8); abrupt wavy boundary
Bw--9 to 31 cm; loamy sand, very pale brown (10YR 7/4) dry, yellowish brown (10YR 5/4) moist; 8 percent fine dark yellowish brown (10YR 4/6) mottles; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common fine, medium, coarse, and very coarse roots throughout; common very fine and fine interstitial pores; 6 percent rounded gravel; very slightly effervescent; moderately alkaline (pH 7.9); clear smooth boundary
C--31 to 50 cm; sand, light yellowish brown (2.5Y 6/3) dry, light olive brown (2.5Y 5/3) moist; single grain; soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots in upper part; common very fine and fine interstitial pores; 8 percent rounded gravel; slightly effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
Cg--50 to 150 cm; coarse sand, gray (2.5Y 6/1) dry, gray (2.5Y 5/1) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine interstitial pores; 8 percent masses of oxidized iron, dark yellowish brown (10YR 4/6) moist; 13 percent rounded gravel; slightly effervescent; moderately alkaline (pH 8.3)
TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.4555155, longitude -135.8327259, datum WGS84 (coordinates determined by a GPS unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic)
Thickness of cambic horizon --15 to 30 cm
Depth to redoximorphic features--more than 50 cm
Particle-size control section
*Clay content--1 to 5 percent
*Total rock fragment content--0 to 14 percent
Oe horizon
Thickness--0 to 10 cm
A horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--1 to 4 moist or dry
Fine-earth texture--sandy loam, coarse sandy loam
Clay content--3 to 8 percent
Total rock fragment content--0 to 10 percent
Gravel content--0 to 8 percent
Reaction (pH)--5.9 to 7.0
Thickness--2 to 15 cm
Bw horizon
Hue--7.5YR to 2.5Y moist or dry
Value--4 or 5 moist, 6 or 7 dry
Chroma--3 to 6 moist or dry
Fine-earth texture--loamy sand, loamy coarse sand
Clay content--3 to 5 percent
Sand content--82 to 85 percent
Total rock fragment content--0 to 10 percent
Gravel content--0 to 10 percent
Reaction (pH)--6.8 to 8.0
Effervescence--noneffervescent, very slightly effervescent
Thickness--15 to 30 cm
C horizon
Hue--10YR or 2.5Y moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--1 to 4 moist or dry
Fine-earth texture--sand, coarse sand
Clay content--1 to 5 percent
Sand content--91 to 98 percent
Total rock fragment content--0 to 13 percent
Gravel content--0 to 13 percent
Reaction (pH)--7.2 to 8.2
Effervescence--very slightly effervescent, slightly effervescent
Thickness--10 to 50 cm
Cg horizon
Hue--10YR or 2.5Y moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--1 or 2 moist or dry
Fine-earth texture--sand, coarse sand
Clay content--1 to 5 percent
Sand content--93 to 98 percent
Total rock fragment content--0 to 14 percent
Gravel content--0 to 14 percent
Reaction (pH)--7.5 to 8.3
Effervescence--very slightly effervescent, slightly effervescent
Thickness--80 to 110 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--0 to 40 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--850 to 3250 mm
Mean annual air temperature--0 to 9 degrees C
Frost-free period--90 to 154 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Gustavus--no aquic conditions within a depth of 150 cm (well drained); on similar landforms
Ibach--umbric epipedon; on adjacent moraines
Perouse--saturation and aquic conditions at or near the soil surface; on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained, well drained
Depth to saturation in normal years--more than 50 cm
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in A horizon, high or very high in Bw horizon, very high in C and Cg horizons
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--Sitka alder, kinnikinnick, bunchberry dogwood, black crowberry, splendid feather moss, heartleaf twayblade, sidebells wintergreen, lodgepole pine, Sitka spruce, Schreber's big red stem moss, western hemlock, oval-leaf blueberry
DISTRIBUTION AND EXTENT: Alexander Archipelago-Gulf of Alaska Coast, Alaska; MLRA 220; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; 2020.
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 9 to 31 cm
*Free carbonates--zone from 9 to 150 cm
*Redoximorphic concentrations--zone from 50 to 150 cm
*Reduced matrix--zone from 50 to 150 cm
*Aquic conditions--zone from 50 to 150 cm
*Particle-size control section--zone from 28 to 103 cm
A drained phase of this series is recognized in the soil survey area of Glacier Bay National Park and Preserve, Alaska.
National Cooperative Soil Survey
U.S.A.