Archaeology News Network: Secrets of the Paleo diet - Archaeological discovery reveals plant-based menu of prehistoric humans.

Slightly misleading. No, they weren't vegetarian. This is just one pillar of the tripod (fish and mammals as well). Interesting to contrast against what they found over the way at the historic Arroyo Hondo Pueblo. Remains of something like 96 different species of animals, in addition to farmed plant foods. Basically if it walked, flew or slithered within reach, it got eaten. The variety is greater than today's, and quite astonishing.