The first occurrence of a toxodont (Mammalia, Notoungulata) in the United States Lundelius, Ernest L., Jr. ; Bryant, Vaughn M. ; Mandel, Rolfe ; Thies, Kenneth J. ; Thoms, Alston Abstract Publication: Journal of Vertebrate Paleontology Pub Date: January 2013 DOI: 10.1080/02724634.2012.711405 Bibcode: 2013JVPal..33..229L