Paleoenvironments of the earliest stone toolmakers, Gona, Ethiopia Quade, Jay; Levin, Naomi; Semaw, Sileshi; Stout, Dietrich; Renne, Paul; Rogers, Michael; Simpson, Scott Abstract Publication: Geological Society of America Bulletin Pub Date: 2004 DOI: 10.1130/B25358.1 Bibcode: 2004GSAB..116.1529Q