Abstract
A calcium-rich paleosol, preserved on buried till and buried colluvial surfaces, was discovered at several locations in the central Lemhi Mountains. The strati-graphic and pedologic characteristics of the paleosol assign its formation to the Interglacial between the Pinedale and Bull Lake Glaciations, between about 127,000 and 50,000 years before present. Pollen extracted from the paleosol reveal, in association with pedologic data, the horizons above the B2t level were decapitated by subsequent glacial and colluvial erosion. Interpretation of the pollen assemblage reveals that the lower treeline rose a minimum of 120–150 m during the interglacial, which must have been considerably warmer and drier than at present. [Key words: paleosol, Pinedale/Bull Lake Interglacial, paleoenvironmental reconstruction, pollen analysis, Lemhi Mountains, Idaho.]
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