Breadcrumb Home Search Showing results for Language Content type Photo (4) Article (2) Slideshow (1) Article Type Article (1) Personal Perspectives (1) Topics (-) Ancient Seas (7) (-) Extinctions (7) At The Museum (2) Evolution (2) Extinctions (2) Marine Mammals (2) Plants & Algae (1) Tags Scientific illustrations (4) Ancient sea life (2) Fossils (2) Mussels, Oysters & Relatives (2) Paleobiology (2) Smithsonian scientists (2) Whales (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 Photo Ammonite January 2010 View Image Photo Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago) December 2009 View Image Article Whale fossils on the mainland, and into a CT scanner May 2012 Read the Full Article Article Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows August 2016 Read the Full Article