Publications by authors named "Michael H Marshall"

Climatic change is widely acknowledged to have played a role in the dispersal of modern humans out of Africa, but the timing is contentious. Genetic evidence links dispersal to climatic change ~60,000 years ago, despite increasing evidence for earlier modern human presence in Asia. We report a deep seismic and near-continuous core record of the last 150,000 years from Lake Tana, Ethiopia, close to early modern human fossil sites and to postulated dispersal routes.

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The Younger Dryas Stadial (YDS) was an episode of northern hemispheric cooling which occurred within the Last Glacial Interglacial Transition (LGIT). A major driver for the YDS climate was a weakening of the Atlantic Meridional Overturning Circulation (AMOC). It has been inferred that the AMOC began to strengthen mid-YDS, producing a bipartite structure of the YDS in records from continental Europe.

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Article Synopsis
  • Radiocarbon dating ((14)C) helps determine the age of carbon-containing materials, useful for studying up to 50,000 years old samples, and tracking the global carbon cycle.
  • The absence of detailed atmospheric (14)C records before 12.5 thousand years ago has hindered the dating of Last Glacial period samples.
  • New (14)C findings from Lake Suigetsu in Japan offer a complete timeline for terrestrial radiocarbon, enabling comparisons with other climatic data and revealing the relationship between global atmospheric and regional marine radiocarbon levels.
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