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  1. The chronology of the Inka Empire is poorly resolved, with most scholars utilizing apost hocethnohistoric reconstruction of imperial expansion as a common reference point. Radiocarbon-based analyses can now accomplish sufficient resolution for meaningful independent estimates of Inka chronology, however, and it is incumbent upon archaeologists to develop such appraisals. Here we produce a Bayesian analysis of radiocarbon data from the Upper Loa River area of northern Chile to estimate the timing of Inka incorporation of this region. In order to accurately associate samples with Inka rule, only radiocarbon dates from Inka sites without prior occupations are used (n = 34), producing a model for the onset of Inka rule of AD 1401–1437 (95% hpd) with a median date of AD 1420. This estimate is further used as a point of comparison for understanding diachronic imperial processes in the region. Site-level models of a variety of site types indicate that the Inka rapidly founded several administrative/mining bases at the onset, followed by the addition of smaller infrastructure components during a second pulse of activity near the middle of the 15th century. Date assemblages at the agricultural sites of Topaín and Paniri also indicate a decline in activity at the former and an increase in activity at the latter from early on in Inka rule. These results provide a high-resolution data point for reconstructing Inka imperial chronology, and expanding such studies will be essential to understanding processes of Inka imperialism at larger scales. 
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  2. La datation par le radiocarbone est rarement utilisée dans l'archéologie de l'Amérique du Nord, historique ou de l’époque des contacts, en raison des particularités de la courbe de calibration qui donnent lieu aux dates ambiguës pour le calendrier. Nous explorons le potentiel et les exigences pour les datations radiocarbone et d'analyses Bayésienne afin de créer un calendrier pour les sites de début de la période contact dans le nord-est de l'Amérique du Nord séparent des hypothèses et approximations impliquées dans les constructions temporelles basées sur les marchandises commerciales et d'autres corrélats archéologiques. Comme démonstration, nous utilisons la modélisation chronologique Bayésienne pour analyser les dates par le radiocarbone sur des échantillons éphémères et un poteau de quatre sites Huron-Wendat Arendarhonon (Benson, Sopher, Ball et Warminster) afin d’établir une chronologie indépendante. Nous trouvons que Warminster était probablement occupé pendant 1615–1616, ce qui en fait le candidat le plus probable pour le site de Cahiagué visité par Samuel de Champlain en 1615–1616, par rapport à l'autre alternative principale suggérée, Ball, qui est plus ancien, comme les sites Sopher et Benson. En fait, le site Benson semble dater d'environ cinquante ans (~50) plus tôt que prévu. Nous présentons les méthodes employées pour arriver à ces nouvelles estimations d’âge indépendant et affirmons qu'une re-datation absolue des sites de l'époque historique est nécessaire pour évaluer avec précision les interprétations existantes basées sur la datation relative et les récits régionaux associés. 
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  3. A time frame for late Iroquoian prehistory is firmly established on the basis of the presence/absence of European trade goods and other archeological indicators. However, independent dating evidence is lacking. We use 86 radiocarbon measurements to test and (re)define existing chronological understanding. Warminster, often associated with Cahiagué visited by S. de Champlain in 1615–1616 CE, yields a compatible radiocarbon-based age. However, a well-known late prehistoric site sequence in southern Ontario, Draper-Spang-Mantle, usually dated ~1450–1550, yields much later radiocarbon-based dates of ~1530–1615. The revised time frame dramatically rewrites 16th-century contact-era history in this region. Key processes of violent conflict, community coalescence, and the introduction of European goods all happened much later and more rapidly than previously assumed. Our results suggest the need to reconsider current understandings of contact-era dynamics across northeastern North America. 
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