LOCATION HOLLOW                  AK

Established Series
Rev. JWM/JPM
05/2022

HOLLOW SERIES

The Hollow series consists of very deep, somewhat poorly drained soils that formed in alluvium. Hollow soils occur on floodplains and outwash plains. Slopes range from 0 to 5 percent. The mean annual temperature is about 41 degrees F., and the average annual precipitation is about 47 inches.

TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Cryofluvents

TYPICAL PEDON: Hollow gravelly sandy loam - on a nearly level floodplain at 150 feet elevation under forest vegetation. (All colors are for moist soil unless otherwise stated).

Oi--1 inch to 0; mat of slightly decomposed leaves and roots; abrupt smooth boundary. (1 to 3 inches thick)

A--0 to 1 inch; dark brown (10YR 3/3) gravelly sandy loam; weak fine granular structure; friable; nonsticky and nonplastic; many very fine, fine, medium, and coarse roots; 25 percent gravel; slightly effervescent; neutral (pH 7.2); clear smooth boundary. (1 to 4 inches thick)

Cl--1 to 16 inches; dark grayish brown (10YR 4/2) very gravelly sand stratified with thin lenses of silt; single grain; loose; nonsticky and nonplastic; few fine roots; 35 percent gravel, 10 percent cobble; slightly effervescent; neutral (pH 7.2); clear smooth boundary. (0 to 60 inches thick)

C2--16 to 60 inches; dark grayish brown (10YR 4/2) extremely gravelly sand stratified with thin lenses of silt; single grain; loose; nonsticky and nonplastic; few fine roots; 55 percent gravel, 15 percent cobble; strongly effervescent; neutral (pH 7.2).

TYPE LOCATION: Haines Area, Alaska; NE 1/4, SE 1/4, Section 2, T.29S., R.56 E., Copper River Meridian.

RANGE IN CHARACTERISTICS: Texture of the 10 to 40 inch control section is sand stratified with lenses of loamy sand and silt loam. Coarse fragment content in the control section ranges from 35 to 70 percent. Depth to the water table is commonly below 40 inches but will raise to within 20 to 30 inches of the soil surface for more than two weeks during the growing season. Reaction throughout the profile is slightly acid to moderately alkaline.

The A horizon, when present, has hue of 2.5Y, 10YR, or 7.5YR, value from 3 through 5 moist, and chroma from 2 through 4 moist. Texture is silt loam or sandy loam. Coarse fragment content ranges from 0 to 35 percent with 0 to 35 percent gravel and 0 to 10 percent cobble.

The C horizons have hue of 5Y, 2.5Y, or 10YR, value from 3 through 5 moist, and chroma from 2 through 4 moist. Texture is sand stratified with lenses of loamy sand and silt loam. Coarse fragment content ranges from 35 to 70 percent, with 20 to 60 percent gravel and 0 to 30 percent cobble. Reaction to 10 percent HCl ranges from slightly to strongly effervescent.

COMPETING SERIES: These are the Jarvis, Niklason, and Tonowek series in the same subgroup. These soils all have coarse-loamy material in the upper part of the control section.

GEOGRAPHIC SETTING: The Hollow soils occur on floodplains and outwash plains. The soils formed in alluvium consisting of calcareous sand and gravels. The climate is humid maritime with the average annual precipitation ranging from 21 to 65 inches. Mean annual temperature ranges from 40 to 43 degrees F. The frost free season is 90 to 150 days. Slopes range from 0 to 5 percent. Elevations range from sea level to 1000 feet.

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Ashmun, Funter, Lutak, Skagway, and Tsirku soils. Ashmun, Skagway, and Tsirku soils occur on adjacent floodplains. Ashmun soils are poorly drained, Skagway soils contain less than 20 percent gravel in the control section, and Tsirku soils have a coarse-loamy control section. Funter soils consist of peat and occur in muskegs. Lutak soils occur on alluvial terraces and moraines and have a spodic horizon.

DRAINAGE AND PERMEABILITY: Somewhat poorly drained; rapid permeability; slow runoff; these soils are subject to frequent flooding.

USE AND VEGETATION: The Hollow soils are used for wildlife habitat, recreation and some timber production. The native vegetation is dominantly cottonwood with an understory of Sitka alder, devil's club, horsetail, and mosses.

DISTRIBUTION AND EXTENT: Southeastern Alaska. The series is of minor extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Haines Area, Alaska. 1985

REMARKS: Based on stratification and colors, there is assumed to be an irregular decrease in organic carbon content. Sandy skeletal material extends from 1 to 60 inches.

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National Cooperative Soil Survey
U.S.A.