In the 1940's and dated at 2500 bc based on associated charcoal, not the corn itself. Squash at Bat Cave dates to 1500-2000bc.
Storage pits contain wild seeds, but also corn.
Crude pottery has been found at the site, also figurines and shell fron the Sea of Cortez. Up until now, it was thought people were living in the highlands. Thought the site was contemporary with Paquime, but didn't find any pottery. Paleoethnobotanical analysis indicated amaranth seed had thin seed coat, was not a wild plant. Amaranth was probably domesticated in Mexico and spread with corn to the southwest.