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North America Archives - DRI
New Study Traces Indigenous Population Shifts in North America Before Europeans

New Study Traces Indigenous Population Shifts in North America Before Europeans

DRI’s Erick Robinson, Associate Research Professor of Climate and Archaeology, co-authored a new study that provides insight into North America’s Indigenous communities prior to European contact. The research found that although Indigenous populations varied regionally, the continent saw a population peak around 1150 A.D. before experiencing declines, likely stemming from drought, disease, emigration and warfare. A brief recovery around 1500 A.D. was followed by a sharp decrease upon the arrival of Europeans.

First-ever layered lake-sediment sample extracted from subglacial Antarctica

First-ever layered lake-sediment sample extracted from subglacial Antarctica

Since the discovery 50 years ago of subglacial lakes in Antarctica — some of the least accessible geological features on Earth — scientists have attempted to extract lake bed sediment to learn about the formation, movement, and past conditions of the ice sheet. Now, a team of researchers with the NSF-funded project Subglacial Antarctic Lakes Scientific Access (SALSA) has successfully done so, recovering the first layered sediments from beneath the modern Antarctic ice sheet.