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- W2056529255 abstract "We present 12 accelerator mass spectrometry (AMS) 14C and five quartz single-grain optically stimulated luminescence (OSL) ages from three Early Agricultural period irrigation canals recently discovered in the floodplains of the Santa Cruz River and Rillito Creek in Tucson, Arizona. Significant discrepancies in the AMS 14C ages are associated with fluvial redeposition of charcoal, producing at times, age overestimates of ∼1000 years. Single-grain OSL ages on canal sediments and application of a minimum age model accurately date the final operation of the canals but have relatively large standard errors of several hundred years. Based on single-grain OSL, one canal dates 730–310 B.C. and the other two date 560–100 B.C. This corresponds with a period of predominant floodplain aggradation (∼500 B.C.–A.D. 1) conducive to water control and irrigation agriculture. Stratigraphic evidence of uncontrolled flooding and rapid sedimentation is present in all three canals and marks the abandonment of two canals. Determining the age of the earliest canals is important for understanding the origins of water management and the transition from foraging to intensive agriculture in the North American Southwest. Due to potential problems with reworked organic material for 14C dating and partial bleaching (resetting) of luminescence signals in fluvial settings, we recommend a combined AMS 14C and single-grain OSL approach for dating early canals." @default.
- W2056529255 created "2016-06-24" @default.
- W2056529255 creator A5007348487 @default.
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- W2056529255 date "2014-01-01" @default.
- W2056529255 modified "2023-10-01" @default.
- W2056529255 title "Combining radiocarbon and single-grain optically stimulated luminescence methods to accurately date pre-ceramic irrigation canals, Tucson, Arizona" @default.
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- W2056529255 doi "https://doi.org/10.1016/j.jas.2013.08.003" @default.
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