This article discusses the evolution of the late Ychsma style. Recent excavations in pyramid complex no III have uncovered a fine corpus of ceramic material which includes complete vessels as well as diagnostic sherds. Radiocarbon dates place the Late Ychsma style from the end of the 14th century to the arrival of the Incas on the central coast. There appear to be two phases in the style, the first of which precedes the Inca regime. The second phase refers to the period under the Incas who introduced new forms and decorative techniques. Manufacturing techniques as well as the evolution of forms and their decoration are given full discussion. Finally a new method of seriation is proposed, which confirms the placement of certain forms and decorative features within these phases.

Pachacamac, covering an area of about 600 hectares (ha) near the Pacific shore, is one of the largest and most important archaeological sites in Peru. Most of the monumental adobe-made buildings of the later pre-Inca period (or Late Intermediate Period, about 10th–15th century AD) are so-called pyramids with ramps (the role of the ramps has been interpreted in different ways). Precise dating of the pyramids appears as a crucial step in defining the functions of Pachacamac in pre-Inca times. In this paper, we present the results obtained from 3 field campaigns at Pyramid III, one of the biggest buildings of the site. A total of 24 radiocarbon datasets from 4 different laboratories will help us to place the various steps of development of Pyramid III on a timescale, defined on the basis of the excavations. More absolute dates are available from another pyramid with ramps, which allow us to make comparisons and propose a new model of interpretation for the Pachacamac site during the Late Intermediate Period (LIP).

This is a study of the historical, archaeological, and anatomical/pathological evidence for human sacrifice at the Peruvian coastal site of Pachacamac during the Late Intermediate and Late Horizon Periods (A.D. 1000-1475 and 1475-1533). It highlights the problems associated with the identification of archaeological sacrifice, then goes on to summarize the pathological and cultural evidence from the site. The significance of this evidence is evaluated using not only traditional paradigms but also the notion of “deviant” burial; this is proposed as a formalized means of identifying archaeological sacrifice in collaboration with—and in the absence of—other indicators. Comparisons are carried out with selected sites and periods, and in both coastal and inland regions. Supplementary evidence from international contexts is also considered. The anatomical and contextual findings from Pachacamac reflect a shift from the somewhat sanguineous cultures such as the Nasca and the Moche, to the perfection-obsessed sacrificial modality of the Incas. The former seems to be concerned primarily with retainer burials and the punishment of enemies or opponents, which were offered to an uncertain eternity as a gesture to some higher power. The iconographic, archaeological, and anatomical evidence for sacrifice in these groups is commensurately dramatic. In the case of the Incas, the sacrifices were intended to bless objects or missions, give thanks, or to appeal for supernatural favors or assistance. We go on to propose—for the first time in Latin America—a theoretical framework for identifying and interpreting “deviant” burials in the Andean archaeological record.

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Guinea pigs (Cavia spp.) have a long association with humans. From as early as 10,000 years ago they were a wild food source. Later, domesticated Cavia porcellus were dispersed well beyond their native range through pre-Columbian exchange networks and, more recently, widely across the globe. Here we present 46 complete mitogenomes of archaeological guinea pigs from sites in Peru, Bolivia, Colombia, the Caribbean, Belgium and the United States to elucidate their evolutionary history, origins and paths of dispersal. our results indicate an independent centre of domestication of Cavia in the eastern colombian Highlands. We identify a peruvian origin for the initial introduction of domesticated guinea pigs (Cavia porcellus) beyond South America into the caribbean. We also demonstrate that peru was the probable source of the earliest known guinea pigs transported, as part of the exotic pet trade, to both Europe and the southeastern United States. Finally, we identify a modern reintroduction of guinea pigs to Puerto Rico, where local inhabitants use them for food. This research demonstrates that the natural and cultural history of guinea pigs is more complex than previously known and has implications for other studies regarding regional to global-scale studies of mammal domestication, translocation, and distribution. The use of ancient DNA (aDNA) in studies of animal domestication and subsequent translocation has radically improved our ability to identify spatially, temporally, and culturally variable processes of domestication and the diversity of social networks behind domestic species distribution (e.g. 1,2). Increasingly, aDNA studies are revising previous assumptions of geographically conscripted animal domestication and dispersal events to reveal multiple centers, timings, and processes of domestication of the world's most prominent domestic animals (e.g. pigs, chickens, cattle, dogs 3-6). Because domestic animals are exemplar proxies for investigating past human migration and interaction, understanding long-term, diachronic patterns of when and where species domestication and