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  • and sediment organic matter was included. These regional results yield information on vegetation change, fire history, and herbivore impacts, which is sorely needed given the paucity of regional pollen records.
  • This article provides new data and synthesizes earlier findings on the carbon isotope ratios of the humin part of soil organic matter from a range of sites in the central Maya Lowlands (ancient Maya wetland fields, upland karst wetlands, ancient