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      Settling down at Ceibal and Cuello: variation in the transition to sedentism across the Maya lowlands

      Frontiers in Human Dynamics
      Frontiers Media SA

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          Abstract

          During the Middle Preclassic period (c. 1000–350 BCE), the people of the Maya lowlands transitioned from a mobile horticulturalist to sedentary farming lifestyle, exemplified by permanent houses arranged around patios and rebuilt over generations. Early evidence of this change has been found in northern Belize, in the Belize Valley, and at Ceibal, Guatemala. At Cuello and other sites in northern Belize, mortuary rituals tied to ancestor veneration created inequality from the beginning of sedentary life. There, relatively dense populations facilitated the emergence of competitive sociopolitical strategies. However, Maya communities in different regions adopted different aspects of sedentism at different times and employed different power strategies. Unlike Cuello, Ceibal was founded as a ceremonial center by semi-mobile people. Middle Preclassic ritual practices at Ceibal and in the Belize Valley were associated with more collective leadership. At the end of this period, increased population densities contributed to a shift to more exclusionary rituals and political strategies throughout the lowlands.

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          THE INTCAL20 NORTHERN HEMISPHERE RADIOCARBON AGE CALIBRATION CURVE (0–55 CAL kBP)

          Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14 C concentration. Although calibration curves are constructed from independently dated archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume the international 14 C calibration curves for both the Northern and Southern Hemispheres, as well as for the ocean surface layer, have been updated to include a wealth of new data and extended to 55,000 cal BP. Based on tree rings, IntCal20 now extends as a fully atmospheric record to ca. 13,900 cal BP. For the older part of the timescale, IntCal20 comprises statistically integrated evidence from floating tree-ring chronologies, lacustrine and marine sediments, speleothems, and corals. We utilized improved evaluation of the timescales and location variable 14 C offsets from the atmosphere (reservoir age, dead carbon fraction) for each dataset. New statistical methods have refined the structure of the calibration curves while maintaining a robust treatment of uncertainties in the 14 C ages, the calendar ages and other corrections. The inclusion of modeled marine reservoir ages derived from a three-dimensional ocean circulation model has allowed us to apply more appropriate reservoir corrections to the marine 14 C data rather than the previous use of constant regional offsets from the atmosphere. Here we provide an overview of the new and revised datasets and the associated methods used for the construction of the IntCal20 curve and explore potential regional offsets for tree-ring data. We discuss the main differences with respect to the previous calibration curve, IntCal13, and some of the implications for archaeology and geosciences ranging from the recent past to the time of the extinction of the Neanderthals.
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            Radiocarbon Calibration and Analysis of Stratigraphy: The OxCal Program

            People usually study the chronologies of archaeological sites and geological sequences using many different kinds of evidence, taking into account calibrated radiocarbon dates, other dating methods and stratigraphic information. Many individual case studies demonstrate the value of using statistical methods to combine these different types of information. I have developed a computer program, OxCal, running under Windows 3.1 (for IBM PCs), that will perform both 14C calibration and calculate what extra information can be gained from stratigraphic evidence. The program can perform automatic wiggle matches and calculate probability distributions for samples in sequences and phases. The program is written in C++ and uses Bayesian statistics and Gibbs sampling for the calculations. The program is very easy to use, both for simple calibration and complex site analysis, and will produce graphical output from virtually any printer.
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              Ritual Theory, Ritual Practice

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                Author and article information

                Journal
                Frontiers in Human Dynamics
                Front. Hum. Dyn.
                Frontiers Media SA
                2673-2726
                January 25 2024
                January 25 2024
                : 6
                Article
                10.3389/fhumd.2024.1354725
                bb9c34f0-ae51-499d-886c-80fc8621a9ed
                © 2024

                Free to read

                https://creativecommons.org/licenses/by/4.0/

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