Abstract
Fresnal Shelter is one of few known preceramic sites in southern New Mexico with evidence of early agriculture. Recent tandem accelerating mass spectrometer (TAMS) radiocarbon determinations on corn and bean samples indicate that cultigens were used at this site as early as 2945 ± 55 B.P. In addition to providing more evidence of Late Archaic agriculture in the desert regions of the American Southwest, these new data and other previously unpublished radiocarbon dates from the site also illustrate the problem of relying on wood charcoal dates in association with cultigens to determine the age of early agriculture.