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Recent geomorphic history in the area of experimental watersheds 1, 2, 3, 9, and 10, H. J. Andrews Forest

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  • Studies in the lower Lookout Creek-Blue River area have revealed a geomorphic history including glaciation and the development of three alluvial surfaces, presently active alluvial cones and older, deeply dissected cone remnants. Results are based on landform mapping, analysis of the types and distributions of surficial sediments, and the distribution of Mazama ash. Presence of the ash makes it possible to date geomorphic features relative to a time horizon about 8,000 years in age. This work has served to identify individual cones which will be studied further to learn the erosional histories of specific watersheds.
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