Breadcrumb Home Search Showing results for Language Content type Photo (2) Article (1) Slideshow (1) Article Type Article (1) Topics (-) Ancient Seas (4) (-) Extinctions (4) Evolution (2) At The Museum (1) Extinctions (1) Marine Mammals (1) Plants & Algae (1) Tags Scientific illustrations (2) Site Search Sort by RelevanceTitle SortAuthored on Order AscDesc Sort By RelevanceA-ZZ-ANewestOldest Slideshow The Ocean Throughout Geologic Time, An Image Gallery September 2011 See the Full Slideshow Photo Cretaceous-Paleogene Boundary (65 Million Years Ago) September 2011 View Image Photo Elevator Rudists January 2018 View Image Article Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows August 2016 Read the Full Article