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Combined data suggest continuous occupation of the landform with periods of more intensive use and highlight taphonomic biases resulting from inundation. Calibrated radiocarbon dates using a Kernel Density Estimation model, an updated shell calibration curve, and georeferenced historic aerials and maps shed light on the timing of the formation of Cassimer Bar as a landform, and on changes in the bar’s habitation patterns over the Holocene. This study reevaluates the chronology of the Wells project area, focusing on Cassimer Bar, by examining radiocarbon dates acquired in the project area since the last major synthetic study of the region over 30 years ago. A key aspect of models developed for the area has been tied to apparent occupational hiatuses in the regional record. The Wells Dam Project area of the Upper-Middle Columbia River has been central to developing our understanding of long-term use of the central Washington Plateau and the development of Plateau land-use models as well as to understanding complex sedentary -foragers more broadly. We conclude that the oldest demonstrated occupation of Cooper’s Ferry dates to ∼11,500 calendar years ago, although ambiguous evidence might (but probably does not) indicate an earlier episode of occupation at ∼14,600–14,100 calendar years ago.
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is incompatible with emerging paleogenomic evidence. We also show that the coastal migration theory proposed by Davis et al. They claim that initial occupation of this site dates from ∼16,000 calendar years ago, that the first inhabitants came from northern Japan, and that this site conclusively demonstrates that “humans initially migrated into the Americas along the Pacific coast.” Here, we critically examine the chronological, geoarchaeological, and artifactual evidence for the claimed antiquity of the Cooper’s Ferry site and show that this evidence remains inconclusive.
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“Late Upper Paleolithic Occupation at Cooper’s Ferry, Idaho, USA, ∼16,000 Years Ago.” Science 365: 891–897.,, , ) recently presented the results of excavations at the Cooper’s Ferry site, located beside the Salmon River in Idaho. , David B.Madsen, LorenaBecerra-Valdivia, ThomasHigham, David A.Sisson, Sarah M.Skinner, DanielStueber, et al.
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