When Sharks Swam the Great Plains

PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons ↓ More info below ↓ If you’ve ever been to, or lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic. Thanks to Dmitry Bogdanov, Nobu Tamura, C.R. Scotese, NASA and the many others listed throughout the video for making their images available to use. Produced for PBS Digital Studios. Super special thanks to the following Patreon patrons for helping make Eons possible: Katie Fichtner, Anthony Callaghan, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Anel Salas, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, John Vanek, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Sapjes, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ruben Winter, Ron Harvey Jr, Jacob Gerke, Alex Yan If you d like to support the channel, head over to http://patreon.com/eons and pledge for some cool rewards! Want to follow Eons elsewhere on the internet? Facebook - https://www.facebook.com/eonsshow Twitter - https://twitter.com/eonsshow Instagram - https://www.instagram.com/eonsshow/ References: Oceans of Kansas: A Natural History of the Western Interior Seaway (Second Edition) by Michael J. Everhart. https://www.tandfonline.com/doi/abs/10.1080/02724634.2014.838573?journalCode=ujvp20#.U8BQ-61OURY https://www.researchgate.net/publication/259517413_Cretaceous_Eustasy_Revisited https://www.researchgate.net/profile/Joshua_Slattery/publication/280641436_EARLY_CRETACEOUS_TO_PALEOCENE_PALEOGEOGRAPHY_OF_THE_WESTERN_INTERIOR_SEAWAY_THE_INTERACTION_OF_EUSTASY_AND_TECTONISM/links/55c0927208aed621de13c50d/EARLY-CRETACEOUS-TO-PALEOCENE-PALEOGEOGRAPHY-OF-THE-WESTERN-INTERIOR-SEAWAY-THE-INTERACTION-OF-EUSTASY-AND-TECTONISM.pdf https://www.researchgate.net/publication/321632109_The_Late_Cretaceous_Western_Interior_Seaway_as_a_model_for_oxygenation_change_in_epicontinental_restricted_basins https://www.tandfonline.com/doi/abs/10.1080/02724634.2011.601714 https://www.jstor.org/stable/1306568 https://www.sciencedirect.com/science/article/pii/003101829090110S https://pubs.er.usgs.gov/publication/pp1561 http://rspb.royalsocietypublishing.org/content/278/1706/681.short https://link.springer.com/article/10.1007%2FBF02990187 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/44/11/903/195080/temperature-and-salinity-of-the-late-cretaceous?redirectedFrom=fulltext https://www.rushcounty.org/PostRockMuseum/PostRockMuseum2.htm