01581nas a2200205   4500008004100000022001400041245007400055210006900129260001200198300001400210490000700224520095900231653001501190653001501205653001001220653001601230100001701246700001901263856009301282       2022                        eng d  a0033-822200aAccelerator Mass Spectrometry Dating of Meadowcroft Rockshelter Maize0 aAccelerator Mass Spectrometry Dating of Meadowcroft Rockshelter   c04/2022  a265–2770 v643 a<p>The Meadowcroft Rockshelter in southwestern Pennsylvania is best known for its pre-Clovis occupation. Potentially important for later times is the recovery of maize macrobotanical remains from higher strata dating as early as the 4th century BC based on radiometric radiocarbon (14C) dates on wood charcoal. These remains have been considered to be potentially as old as the earliest microbotanical evidence for maize in Michigan, New York and Québec recovered from directly dated charred cooking residues adhering to pottery. The results of accelerator mass spectrometry (AMS) dating 17 samples from maize specimens from all Meadowcroft strata producing maize, indicate that the specimens originated from historical use of the shelter, most likely after AD 1800. These results further emphasize the need to obtain direct dates on maize macrobotanical remains recovered from early contexts prior to the development and common use of AMS dating.</p>
10aAMS dating10achronology10amaize10apaleobotany1 aHart, J., P.1 aAdovasio, J, M  uhttps://www.cambridge.org/core/product/identifier/S0033822222000182/type/journal_article