Breadcrumb Home Search Showing results for Language Content type Photo (29) Article (4) Video (2) Overview (1) Article Type Article (4) Topics (-) Through Time (36) Ancient Seas (3) At The Museum (3) Careers (2) Climate Change (2) Evolution (2) Human Connections (2) Invertebrates (2) Exploration (1) Ice (1) Poles (1) Reptiles (1) Sharks & Rays (1) Temperature & Chemistry (1) Tags Ancient sea life (4) Fossils (4) Paleobiology (3) Smithsonian scientists (3) Apex predator (2) Arctic (2) Geologic periods (2) National Museum of Natural History (2) Sea stars & Urchins (2) Sharks (2) Site Search Sort by RelevanceTitle SortAuthored on Order AscDesc Sort By RelevanceA-ZZ-ANewestOldest Video Life in the Ediacaran April 2019 Watch the Video Video Receding Ice Cover January 2011 Watch the Video Photo Jurassic Lagoon April 2019 View Image Photo A Mesozoic Ocean April 2019 View Image Photo Precambrian Timeline May 2019 View Image Photo Paleozoic Timeline May 2019 View Image Photo Mesozoic Timeline May 2019 View Image Photo Trilobite Shapes May 2019 View Image Photo Xiphactinus April 2019 View Image Photo Carboniferous Snails April 2019 View Image Photo Mesozoic Predators April 2019 View Image Photo Megalodons Throughout the World May 2019 View Image Pagination Current page 1 Page 2 Page 3 Next page