That creates a chronology problem for creationists. Creation was around 4000BC, but the Flood was around 2500BC. In the Flood, the human race supposedly perished except for Noah's extended family.
The chronology problem is that there are civilizations whose records extend past 2500BC, like Sumeria, Egypt, Indian, etc. Written records spanning the time line, of large and vigorous civilizations.
Dunno. Maybe these artifacts survived the flood or maybe the accuracy of the artifact dating needs to be verified.