Stephen Plog

For societies with writing systems, hereditary leadership is documented as one of the hallmarks of early political complexity and governance. In contrast, it is unknown whether hereditary succession played a role in the early formation of prehistoric complex societies that lacked writing. Here we use an archaeogenomic approach to identify an elite matriline that persisted between 800 and 1130 CE in Chaco Canyon, the centre of an expansive prehistoric complex society in the Southwestern United States. We show that nine individuals buried in an elite crypt at Pueblo Bonito, the largest structure in the canyon, have identical mitochondrial genomes. Analyses of nuclear genome data from six samples with the highest DNA preservation demonstrate mother–daughter and grandmother–grandson relationships, evidence for a multigenerational matrilineal descent group. Together, these results demonstrate the persistence of an elite matriline in Chaco for ∼330 years.

We review some of the most significant research trends as well as emerging issues in the archaeology of the American Southwest and Northwest Mexico. Among the many topics being studied that we could discuss, we have chosen to focus on engaged archaeology, “big data”, the research potential of museum collections, agriculture, social organization, regional connectivity, and culture history.

Significance: New accelerator mass spectrometer (AMS)¹⁴C dates of scarlet macaw (Ara macao) skeletons from Chaco Canyon in northwestern New Mexico reveal the earliest (A.D. 900–975) direct evidence for procurement of this Neotropical species by Pueblo people from Mesoamerica. By directly dating the macaws, we demonstrate the existence of long-distance acquisition networks throughout much (A.D. 900–1150) of Chaco’s history. In contrast to models of societal evolution that attribute procurement of macaws to the 11^th-century peak of Chacoan influence and architectural expansion, most¹⁴C dates significantly predate this period. We propose that access to and control of these important status markers from Mesoamerica before A.D. 1040 was thus linked to the early formalization of social hierarchy in Chaco.

Chaco Canyon in northwestern New Mexico has been the focus of much recent archaeological research on Pueblo groups who lived during the 9th through 12th centuries in the American Southwest. Here, we examine variation in mortuary patterns in the canyon, focusing in particular on one mortuary crypt, to address questions of social differentiation and the chronology of important sociopolitical processes. Based on new radiocarbon dates as well as reanalysis of the stratigraphy and spatial distribution of materials in the mortuary crypt, we conclude that significant social differentiation began in Chaco ca . 150–200 y earlier than suggested by previous research. We argue that social inequality was sanctified and legitimized by linking people to founders, ancestors, and cosmological forces.

One of the common design characteristics on black-on-white pottery from the eleventh and twelfth centuries in the northern American Southwest is the use of thin, parallel lines (hachure) to fill the interior of bands, triangles, or other forms. This essay explores a proposal offered by Jerry Brody that hachure was a symbol for the color blue-green. Brody's proposal is examined by exploring colors and color patterns used to decorate nonceramic material from the Chaco Canyon region of northwestern New Mexico. His proposal is supported and the implications of this conclusion for Chaco Canyon and for future studies of this nature are discussed.