Paleobiogeography of the Cretaceous Western Interior Seaway of North America: the vertebrate evidence Nicholls, Elizabeth L. ; Russell, Anthony P. Abstract Publication: Palaeogeography Palaeoclimatology Palaeoecology Pub Date: July 1990 DOI: 10.1016/0031-0182(90)90110-S Bibcode: 1990PPP....79..149N