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ABSTRACTTechnological, metric, and microscopic use-wear analyses of the chipped chert and obsidian artifacts from the Chaa Creek chultun present a complex use-history in this underground space. Most, if not all, of the lithics are secondary refuse deposited at this location from other areas of initial production and use. The lithic sub-assemblages within the chultun represent at least two discrete deposition events of expediently produced flakes of local chert used for various domestic/household tasks. The lithics from the construction core of the platform on the surface appear to be secondary refuse that is the product of different formation processes. The number of large whole chert flakes with use wear resulting from contact with wood and stone from the platform construction core suggests an origin from a location or locations in which crafting occurred. By focusing on the stone tools from discrete stratigraphic deposits, it is possible to provide more detailed reconstructions of the various episodes of chultun use.