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    Cross-comparison of last glacial radiocarbon and OSL ages using periglacial fan deposits
    (Elsevier, 2020-10-08)
    Two cores from a Weichselian periglacial alluvial fan were dated using 14C and OSL, to verify the reliability of both methods and check the upper dating limit of the 14C method. Both dating methods yielded a similar chronology for core Eerbeek-I, with infinite 14C dates for the lower part where OSL dates indicated ages of over 45 ka. Finite 14C dates were obtained throughout the core for Eerbeek-II, despite stratigraphic and OSL evidence suggesting ages beyond 14C limits. Apparently, additional chemical pre-treatment to remove younger carbon fractions did not work adequately for samples from this core. We hypothesize that this may be related to a larger influence of younger-age humin fractions in the mainly sandy Eerbeek-II deposits compared to those buffered by a thick peat layer of Eerbeek-I. We suggest that (local) stratigraphy, percolation and humification processes may impact 14C ages of organic deposits more than commonly assumed, and should receive more attention. In addition, we introduce a new method to assess robustness and validity of OSL dates and demonstrate the applicability of OSL dating methods in this setting. Our results highlight that the 14C method requires additional verification methods, such as OSL, for deposits older than 30 ka.
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    Visiones y versiones decimonónicas de la Independencia peruana
    (Pontificia Universidad Católica del Perú, 2022-10-03)
    This article examines the chronology-building of Peruvian Independence based on calendars published between 1821 and 1840. It also analyzes different approaches to the Independence process by authors like Valdez y Palacios, Pruvonena (Riva Agüero), S. Távara, C. Lissón, S. Lorente, M. F. Paz Soldán, and Rodríguez. Their writings show a diversity of solutions to the ambiguity that marked the process and their efforts to enclose it within an unambiguous and continuous temporal sequence.
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    Moche chronology of ancient Peru: Bayesian assessment of radiocarbon dates and ceramic styles from north to south
    (Elsevier Ltd, 2024-09-01)
    In the last decade Bayesian analysis of radiocarbon dates has become commonplace for archaeologists grappling with regional chronologies. Here we present Bayesian analysis for radiocarbon dates from Moche cultural contexts from the north coast of Peru with the aim to understand the duration of the phenomenon and to compile all known dates in a single location for future analysis and use. The analysis demonstrates that the long-standing Moche ceramic sequence does not provide a perfect proxy for tracking the timing of all social interactions. However, our results show general agreement with traditional relative Moche chronologies. Finally, our study shows that Moche was a shorter cultural phenomenon than has been previously argued, with the current data indicating that it began between the late 4th and early 6th centuries CE and lasted until the 9th century CE.