A Cryogenian chronology: Two long-lasting synchronous Neoproterozoic glaciations Rooney, A. D. ; Strauss, J. V. ; Brandon, A. D. ; Macdonald, F. A. Abstract Publication: Geology Pub Date: May 2015 DOI: 10.1130/G36511.1 Bibcode: 2015Geo....43..459R