Breadcrumb Home Search Showing results for Language Content type Photo (4) Article (2) Slideshow (1) Video (1) Article Type Article (1) Personal Perspectives (1) Topics (-) Ancient Seas (8) (-) Extinctions (8) At The Museum (2) Evolution (2) Extinctions (2) Marine Mammals (2) Exploration (1) Plants & Algae (1) Tags Scientific illustrations (4) Fossils (3) Paleobiology (3) Smithsonian scientists (3) Whales (3) Ancient sea life (2) Mussels, Oysters & Relatives (2) National Museum of Natural History (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 Article Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows August 2016 Read the Full Article Video Excavating an Extinct Toothed Whale June 2011 Watch the Video Article Whale fossils on the mainland, and into a CT scanner May 2012 Read the Full Article Photo Elevator Rudists January 2018 View Image Photo Cretaceous-Paleogene Boundary (65 Million Years Ago) September 2011 View Image Photo Ammonite January 2010 View Image Photo Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago) December 2009 View Image