Nano-porous pyrite and organic matter in 3.5-billion-year-old stromatolites record primordial life Baumgartner, Raphael J. ; Van Kranendonk, Martin J. ; Wacey, David ; Fiorentini, Marco L. ; Saunders, Martin ; Caruso, Stefano ; Pages, Anais ; Homann, Martin ; Guagliardo, Paul Abstract Publication: Geology Pub Date: November 2019 DOI: 10.1130/G46365.1 Bibcode: 2019Geo....47.1039B