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Tryon Creek (35WA288) is an ancestral Nez Perce dwelling within Hells Canyon National Recreation Area in northeastern Oregon. The site consists of several household features located on an alluvial terrace west of the Snake River, dating between 1600-500 B.P. Here various flake attributes, abundance of heat-treatment, and raw material composition are compared across occupation levels. The spatial distribution of raw materials and heat-treatment across the site are quantitatively explored using measures of abundance and autocorrelation. The overall abundance of heat-treatment changes significantly through time, reflecting concomitant curation and lithic preparation. Clusters of heat-treated material, separated by raw material type and positioned away from fire-cracked rock (FCR), are also present through time, perhaps reflecting differences in activity zones. Overall, these methods provide a clearer picture of lithic preparation within the household and across time. [ABSTRACT FROM AUTHOR]