Emergence and submergence of Beringia Settlement of the Americas

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figure1. submergence of beringian land bridge post-last glacial maximum (lgm) rise in eustatic sea level


during wisconsin glaciation, varying portions of earth s water stored glacier ice. water accumulated in glaciers, volume of water in oceans correspondingly decreased, resulting in lowering of eustatic sea level. variation of eustatic sea level time has been reconstructed using oxygen isotope analysis of deep sea cores, dating of marine terraces, , high resolution oxygen isotope sampling ocean basins , modern ice caps. drop of eustatic sea level 60 m 120 m lower present-day levels, commencing around 30,000 years bp, caused revealing of beringia durable , extensive geographic feature connecting siberia alaska. rise of sea level after last glacial maximum (lgm), beringian land bridge again submerged. estimates of final re-submergence of beringian land bridge based purely on present bathymetry of bering strait , eustatic sea level curve place event around 11,000 years bp (figure 1). ongoing research reconstructing beringian paleogeography during deglaciation change estimate , possible earlier submergence further constrain models of human migration north america.








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