Accelerated mass spectrometry (AMS) and carbon isotope analyses provide strong tandem methodologies used by archaeologists to evaluate and reevaluate the histories of maize use in the Midwest. In this article, we present newly obtained AMS dates and carbon isotope assays of alleged maize samples from the Icehouse Bottom (40MR23) and Edwin Harness sites (22RO33). Based on original studies, samples were thought to date to the Middle Woodland period (ca. 300 BC–AD 400). The results show that samples either were not maize or date to post-AD 900. As of this finding, there are no longer any securely dated Middle Woodland macrobotanical remains of maize from the Eastern Woodlands of North America.

加速质谱 (AMS) 和碳同位素分析为考古学家提供了强大的串联方法，用于评估和重新评估中西部玉米使用历史。在本文中，我们展示了来自冰库底部 (40MR23) 和 Edwin Harness 站点 (22RO33) 的据称玉米样品的新获得的 AMS 日期和碳同位素分析。根据原始研究，样本被认为可以追溯到中林地时期（约公元前 300 年至公元 400 年）。结果表明，样品要么不是玉米，要么可以追溯到公元 900 年之后。根据这一发现，不再有任何确定日期的北美东部林地玉米的中部林地大型植物遗骸。