The earliest-known fin whale, Balaenoptera physalus, from the Early Pleistocene of northern California, U.S.A. Tsai, Cheng-Hsiu ; Boessenecker, Robert W. Abstract Publication: Journal of Vertebrate Paleontology Pub Date: March 2017 DOI: 10.1080/02724634.2017.1306536 Bibcode: 2017JVPal..37E6536T