If you read the article more carefully you'd see that area in question was a mar...

TSiege on Oct 10, 2022 | parent | context | favorite | on: Archaeologists dig up 1,400-year-old Native Americ...

If you read the article more carefully you'd see that area in question was a marsh, making it difficult to carry. It was only used in wetter seasons. And the people who lived there did not practice agriculture