Test of Martin's overkill hypothesis using radiocarbon dates on extinct megafauna

Area of Science:

• Paleontology
• Archaeology
• Quaternary Science

Background:

• The timing of human arrival in the New World is a long-standing debate.
• Investigating ecological impacts on Pleistocene megafauna offers a novel approach to assess human colonization timing.

Observation:

• Radiocarbon dates from North and South American megafauna fossils were compiled.
• The study examined the temporal and spatial patterns of megafauna extinctions.

Findings:

• Megafauna extinction commenced first in Beringia between 13,300–15,000 BP.
• Extinctions in the contiguous United States (12,900–13,200 BP) and South America (12,600–13,900 BP) occurred later but were closely clustered.
• These extinction patterns align with the predicted spread of human populations and the overkill hypothesis.

Implications:

• The findings support the hypothesis that human presence drove Pleistocene megafauna extinctions.
• This research provides a framework for understanding human-environment interactions during early colonization events.
• The study refines the timeline of human entry into the Americas and its ecological consequences.