In this article we present a synthetic overview and preliminary analysis of the data collected by members of the Sierra del Lacandón Regional Archaeology Project (SLRAP) during four field seasons of research from 2003 to 2007. We examine the growth, development, and transformation of the Classic Maya polities of Piedras Negras, Guatemala, and Yaxchilan, Mexico, located in the Middle Usumacinta Basin. This analysis uses a conjunctive approach, incorporating analyses of iconography, epigraphy, settlement patterns, ceramics, mortuary patterns, and architectural styles. During the Late Preclassic period (c. 250 B.C.-A.D. 350) settlement was scattered widely across the study region and Piedras Negras and Yaxchilan were only two of a number of other equally powerful Preclassic communities. In the Early Classic period (c. A.D. 350-600) royal dynasties were established at both Piedras Negras and Yaxchilan and the population of the region became concentrated at these two sites. During the Late Classic period (c. A.D. 600-810) the political frontier between Piedras Negras and Yaxchilan was repopulated and transformed into a contested border zone surrounding a political boundary. This territorial expansion culminated in endemic warfare by the eighth century A.D., which may have ultimately led to the demise of these two Maya polities.

Recent studies have promoted using soil phosphate analysis to detect ancient Maya sites by delimiting areas of occupation based on decomposed organic matter. Refuse associated with human activity increases organic matter around areas of ancient human habitation. Theoretically, the highest concentration of organic matter—detectable by phosphate analysis—should be directly associated with areas of refuse disposal. Thus, the objective of this study is to investigate the potential of phosphate analysis to detect residential middens in Piedras Negras, Guatemala. This paper presents the results of a sensitive, in‐field phosphate analysis method applied as a midden prospection tool in residential areas. Phosphate concentration is correlated with artifact data obtained from a total of 37 test pits excavated in areas of varying phosphate concentration in three residential sites. A positive correlation between phosphate concentration and ceramic density indicates the potential of this method in defining and orienting excavations of residential areas. © 2001 John Wiley & Sons, Inc.

In this article, we provide the results of preliminary archaeological and epigraphic research undertaken at the site of Lacanjá Tzeltal, Chiapas. Field research conducted in 2018, in collaboration with local community members, has allowed us to identify this archaeological site as the capital of a kingdom known from Classic period Maya inscriptions as “Sak Tz’i’” (White Dog). Because all previously known references to the kingdom came from looted monuments or texts found at other Maya centers, the location of the Sak Tz’i’ kingdom’s capital has been the subject of ongoing modeling and debate among scholars. Here we synthesize prior epigraphic and archaeological research concerning Sak Tz’i’, highlighting past efforts to locate the kingdom’s capital. We then discuss the results of preliminary survey, mapping, and excavations of Lacanjá Tzeltal, and present the first drawing and decipherment of Lacanjá Tzeltal Panel 1, the sculpture crucial for centering this “lost” Maya kingdom.