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Political aspects of imperial architecture are usually evaluated in terms of the symbolism of specific buildings as opposed to overall site planning and layout. This reflects a shortcoming in our understanding of imperial tactics, as provincial site layouts were likely politically calculated. Here we present an architectural study of the Inka provincial capital of Turi, a well-preserved local population center in northern Chile co-opted for Inka imperial administration of the Atacama Desert area. We reevaluate layout planning at the site using concepts of building coordination and inter-site standardization to identify potentially planned features, and add to this a chronological study of surface architecture based upon wall-abutments and radiocarbon dates associated with a sample of building events. Results indicate significant Inka-era remodeling took the pre-existing site’s layout in a more coordinated and monumental direction, serving to increase site symmetry, reference political ideas through inter-site standardization, and focus greater attention upon Inka political buildings. Political buildings themselves grew more formalized and monumental over the course of the imperial occupation, culminating in the construction of a large kallanka state building near the end of the 15th century. Overall, we argue that layout remodeling was used to form increasingly strong architectural pronouncements of state legitimacy over time, and that moving past a ‘planned’ versus ‘unplanned’ conceptual binary will aid in gleaning more information from imperial sites in future research. 

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.