Media type: E-Article Title: Age constraints on the proposed Plio–Pleistocene boundary stratotype at Vrica, Italy Contributor: Obradovich, John D.; Naeser, Charles W.; Izett, Glen A.; Pasini, Giancarlo; Bigazzi, Giulio imprint: Springer Science and Business Media LLC, 1982 Published in: Nature Language: English DOI: 10.1038/298055a0 ISSN: 0028-0836; 1476-4687 Keywords: Multidisciplinary Origination: Footnote: