Abstract
This paper discusses the use of soils as indicators of environmental change in the alpine and sub-alpine zones of the Colorado Rocky Mountains. Textural, miner-alogical, and chemical properties of soils developed on Quaternary glacial moraines are examined. A clear discontinuity in soil properties is observed between surface and subsurface horizons. Surface horizons are commonly finer grained and less strongly weathered than subsurface horizons. The soil-property discontinuity is interpreted to be a reflection of parent-material change. Surface horizons are interpreted to have developed in eolian sediments, while subsurface horizons have developed in glacial till. The duplex soils are believed to reflect alternating changes from cold moist climates and glacial advance to cold dry climates and loess deposition. [Key words: alpine soils, alpine weathering, alpine loess, climate change.]
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