image: Close-up view of typical outcrop of the ancient continental crust on the eastern coast of Hudson Bay showing a complex history of re-melting. This material relates to a paper that appeared in the March 17, 2017, issue of Science, published by AAAS. The paper, by J. O'Neil at University of Ottawa in Ottawa, ON, Canada, and colleagues was titled, "Building Archean cratons from Hadean mafic crust." view more
Credit: Witold Ciolkiewicz