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Geomorphic Surfaces and Soils in the Camas Prairie Area, Washington
Author(s) -
Goldin Alan,
Parsons R. B.
Publication year - 1983
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1983.03615995004700020021x
Subject(s) - geology , tephra , landform , colluvium , radiocarbon dating , alluvium , paleosol , alluvial fan , soil water , eluvium , horizon , volcanic ash , archaeology , sedimentary depositional environment , geomorphology , geochemistry , volcano , paleontology , loess , soil science , geography , sedimentary rock , physics , astronomy , structural basin
The geomorphic surfaces and soils in the Camas Prairie Area, Washington, are described for the first time. Volcanic ash from Mount St. Helens and Mount Mazama has mantled the landforms and has influenced the original soils, which formed primarily in alluvial, colluvial, and lacustrine deposits. The presence of amorphous material and contrasting sediments in several of the soils has modified the usual reflection of geomorphic age in the degree of soil development. The radiocarbon age of 10,210 ± 90 y.a. of huried material in the Conboy soil and the identification of tephra from Mount St. Helens and Mount Mazama indicate a depositional sequence on surfaces ranging in age from 500 to < 13,000 years. Topographic position, tephra identification, and relative and absolute ages are used to identify the five geomorphic surfaces. These relationships, along with horizon sequences and landform features, are used to correlate the surfaces with those of similar age in western Oregon.