ABSTRACT This investigation aggregates intact or reconstructed Gahagan bifaces from the southern Caddo area and central Texas to test the hypothesis that Gahagan biface morphology differs between the regions. The Gahagan bifaces (n=102) were scanned, then analyzed using a novel landmarking protocol and the tools of geometric morphometrics. Results provide a preview of the significant differences in Gahagan biface morphology expressed between the southern Caddo area and central Texas regions. The size discrepancy represents an inversion of current theoretical constructs that posit a decrease in tool size thought to articulate with an increase in distance from the raw material source. It is posited that the contrasting morphologies represent two discrete communities of practice; one (emergent Caddo horticulturalists) where Gahagan bifaces were enlisted primarily for burial and ritualistic activities, and the other (central Texas hunter-gatherers) where Gahagan bifaces were utilized over a longer time span in more practical and utilitarian contexts.

中文翻译：

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对来自南卡多地区和德克萨斯州中部的 Gahagan 双面的种内形态变异的定量评估

摘要 本次调查汇总了来自卡多南部地区和德克萨斯州中部的完整或重建的 Gahagan 双面，以检验各地区之间 Gahagan 双面形态不同的假设。扫描 Gahagan 双面 (n=102)，然后使用新的地标协议和几何形态测量学工具进行分析。结果提供了在南部卡多地区和德克萨斯州中部地区之间表达的 Gahagan 双面形态的显着差异的预览。尺寸差异代表了当前理论结构的倒置，该理论结构假定工具尺寸减小，被认为与与原材料源的距离增加有关。假设对比鲜明的形态代表了两个离散的实践社区；