"The Stoer Group in northwest Scotland is one of the oldest well-preserved sedimentary successions in Europe and includes the Stac Fada Member, an impact ejecta deposit. ...Our new age constrains the Stoer Group to the early Tonian and suggests a new Neoproterozoic plate tectonic context for these rocks. These data revise the age of some of the oldest known nonmarine microfossils in the UK and their role for timing the eukaryotic colonization of land."

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