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@PeterBrannen1 @YearOnEarth The Silurian has some massive carbon isotope swings though (devastating to... uh, well, graptolites and that's about it) (from https://t.co/6ScCd4JRPI) https://t.co/XcYZTsFLaj
Revised correlation of Silurian Provincial Series of North America with global and regional chronostratigraphic units and δ13Ccarb chemostratigraphy
Overview of attention for article published in Lethaia, August 2010