The lowland is underlain by post-accreted Quaternary sands and silts to unknown depth. Basalt flows and cinder cones of Tertiary and Quaternary age exist. Other bedrock consists of Cenozoic sedimentary rocks with inclusions of various other assemblages. Soil Taxa . Dominant soils are Histic Pergelic Cryaquepts and Pergelic Cryofibrists.
Soils are shallow over permafrost and consistently wet.
Potential Natural Vegetation . Wet tundra communities consisting primarily of sedge mats, moss, and low growing shrubs predominate. Alder, willows, and scattered, stunted spruce and birch grow along the major streams. The lakes, streams, and tidal flats interspersed with tundra and sedge flats make this Section exceptional habitat for waterfowl, shorebirds, and furbearers. All of North America's cackling Canada geese are produced in these coastal lowlands.