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This study obtained calendar dates by radiocarbon accelerator mass spectrometry (14C AMS) dating sequential tree-rings of wooden support posts from the buried remains of traditional Kitkahahki Pawnee earthlodges preserved at an archaeological site on the Central Great Plains, USA. The tree-ring segments from the site were dendrochronologically analyzed prior to this study, but the cross-matched site chronology could not be definitively cross-dated and was thus “floating” in time. Our study represents the first floating tree-ring chronology from the Great Plains to be anchored in time by means of independent radiocarbon analysis. Three specimens were analyzed and dated to 1724–1774 CE (82.0% probability), 1774–1794 CE (95.4% probability), and 1800–1820 CE (95.4% probability). These dates correspond to the hypothetical timing of Kitkahahki ethnogensis, the main phase of village growth in the area, and a later reoccupation during a turbulent period in regional history. The results of this study conform to a scenario in which chaotic social conditions correspond to an increase in residential mobility between the core of Pawnee territory and a southern frontier in the Republican River valley.

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During the seventeenth and eighteenth centuries, Puebloan women (if not entire families) were incorporated into Apache Dismal River communities in western Kansas. In at least one site (14SC1), Puebloan people lived in a small masonry pueblo. We evaluate the timing and nature of the Puebloan occupation at 14SC1 and its relationship to the Dismal River population at the site. We use a Bayesian analytical framework to evaluate different models of the pueblo's use history, constraining 12 radiocarbon dates by their stratigraphic data and then comparing this framework with different temporal models based on the historical record. We conclude that Dismal River people lived at 14SC1 prior to the appearance of Pueblo migrants, sometime between cal AD 1490 and 1650. Construction and early use of the pueblo by migrants from the Rio Grande valley occurred between cal AD 1630 and 1660, and the pueblo was closed by burning sometime between cal AD 1640 and 1690. Site 14SC1 lacks Rio Grande Glaze Ware, and its residents seem rarely to have engaged with the groups in the Southern Plains Macroeconomy. Our results contribute to studies of indigenous community formation and Puebloan residential mobility during the Spanish colonial period.