LOCATION PEROUSE                 AK

Established Series
IRD. DKM/NDP/SCD
02/2022

PEROUSE SERIES

Landscape--outwash plains
Landform--outwash deltas
Slope--0 to 5 percent
Parent material--outwash
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--very poorly drained, poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Sandy, mixed Typic Cryaquents

TYPICAL PEDON: Perouse sand on an outwash delta, on a slope of 0 percent at an elevation of 4 m (When described on August 13, 2013, the soil was moist from the surface layer to a depth of 9 cm and wet from a depth of 9 to 150 cm.)

Oe--0 to 4 cm; mucky peat; neutral (pH 7.3); abrupt smooth boundary

Oa--4 to 9 cm; muck; neutral (pH 6.8); abrupt smooth boundary

Cg1--9 to 40 cm; sand, gray (10YR 6/1) dry, dark gray (10YR 4/1) moist; single grain; loose, nonsticky and nonplastic; common fine and medium roots; common very fine and fine interstitial pores ; 5 percent gravel; slightly effervescent (HCL, 1N); moderately alkaline (pH 7.9); gradual smooth boundary

Cg2--40 to 60 cm; sand, grayish brown (2.5Y 5/2) dry, dark gray (N 4/0) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine interstitial pores; 2 percent gravel; strongly effervescent (HCL, 1N); moderately alkaline (pH 8.3); diffuse smooth boundary

Cg3--60 to 150 cm; sand, grayish brown (2.5Y 5/2) dry, dark gray (N 4/0) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine interstitial pores; 5 percent gravel; strongly effervescent (HCL, 1N); moderately alkaline (pH 8.3)

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.4515500, longitude -135.7895550, datum WGS84 (coordinates determined by a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Soil moisture control section--usually saturated at or near the soil surface year round

Particle-size control section
*Clay content--0 to 3 percent
*Total rock fragment content--0 to 10 percent gravel

Oe horizon
Thickness--0 to 8 cm

Oa horizon
Thickness--1 to 8 cm

Cg horizon
Hue--10YR to 5Y or gleyed moist, 10YR to 5Y dry
Value--2 to 4 moist, 3 to 6 dry
Chroma--0 to 3 moist or dry
Fine-earth texture--sand, coarse sand
Clay content--0 to 3 percent
Sand content--90 to 100 percent
Total rock fragment content--0 to 10 percent gravel
Reaction (pH)--7.9 to 8.5
Thickness--20 to 140 cm

COMPETING SERIES:
Abyss--25 to 50 cm (somewhat poorly drained) to aquic conditions; occasional flooding
Ashmun--lithologic discontinuity
Chilkoot--pH of 5.1 to 6.5 in particle-size control section
Monashka--O horizon composed of herbaceous material
Topsy--lithologic discontinuity

GEOGRAPHIC SETTING:
Elevation--0 to 20 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--850 to 1850 mm
Mean annual air temperature--0 to 9 degrees C
Frost-free period--90 to 154 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Gustavus--cambic horizon; on similar landforms
Oberlin--cambic horizon; on adjacent marine terraces
Scidmore--cambic horizon; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained, poorly drained
Saturation in normal years--at or near the soil surface year round
Flooding--none
Ponding--frequent, long periods to none
Saturated hydraulic conductivity (Ksat)--very high throughout

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, 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
*Aquic conditions--zone from the surface to a depth of 150 cm
*Reduced matrix--zone from 9 to 150 cm
*Free carbonates--zone from 9 to 150 cm
*Particle-size control section--zone from 34 to 109 cm

A frequently ponded phase of this series is recognized in the soil survey area of Glacier Bay National Park and Preserve, Alaska.

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National Cooperative Soil Survey
U.S.A.