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Evolving in Shadows: The Oxygen-Poor Origins of Complex Life

A recent study presents an innovative use of dolomite U-Pb geochronology, offering fresh insights into the development of ancient marine ecosystems. Through identifying variations in the U-Pb ratios of dolomite samples, researchers have established a dependable method for estimating the oxygen level

Israel , Hebrew-university , Yerushalayim , Lylel-nelson , Andrew-rc-kylander-clark , Michal-ben , Emilyf-smith , Institute-of-earth-sciences , Israel-science-foundation , Nature-communications , Johns-hopkins-university , Dolomite-sample-from

New Geology articles published online ahead of print in April

reconstructed from sub-ice shelf and offshore sediments
J.A. Smith; C.-D. Hillenbrand; C. Subt; B.E. Rosenheim; T. Frederichs ...
Abstract:
Because ice shelves respond to climatic forcing over a range of time
scales, from years to millennia, an understanding of their long-term
history is critically needed for predicting their future evolution. We
present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS),
eastern Antarctic Peninsula (AP), based on data from sediment cores
recovered from below and in front of the ice shelf. Sedimentologic and
chronologic information reveals that the grounding line (GL) of an expanded
AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53

Hawaii , United-states , Mount-sharp , Queensland , Australia , Mauritania , Henrys-fork , Idaho , Chicxulub , Yucatámx , Mexico , Pacific-ridge