 Excavators identified six soil layers, the uppermost being the plowzone and the others labeled Strata I-V, with Stratum V being the deepest.The plowzone and Stratum I contained artifacts that were predominantly associated with a Late Archaic people known as the Big Sandy culture, who occupied the Eva site roughly 2000-1000 BC (and possibly as late as 500 BC).Stratum II contained artifacts associated with a Middle Archaic people known as the Three Mile culture, who occupied Eva around 4000-2000 BC.