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There is a long time gap between these mammoths and dinosaurs, which went extinct 66 million years ago. There is some evidence, though, that genetic material may survive in fossils even on these timescales.Paul Davidson (February 21, 2006). " Jurassic Park IV Script Ready". IGN. Archived from the original on December 7, 2006 . Retrieved December 10, 2014. Medd, James (June 10, 2018). "Where 'Jurassic World: Fallen Kingdom' was filmed in Hawaii". CN Traveller . Retrieved June 8, 2022. It's a Dino-riffic Week in Toy News". Gizmodo Australia. March 19, 2022 . Retrieved April 17, 2022. Ryfle, Steve (1998). Japan's Favorite Mon-star: The Unauthorized Biography of "The Big G". ECW Press. pp.15–17. ISBN 9781550223484. Whitbrook, James (September 10, 2019). "Out of Nowhere, a New Jurassic World Short Film Is Hitting FX This Weekend". io9. Archived from the original on September 11, 2019 . Retrieved September 11, 2019.

Scientists have yet to find evidence, however, that actual DNA can survive for tens of millions of years. Ancient proteins O'Brien, Lucy (March 29, 2018). "Jurassic World Evolution Wants to Show You The Best Dinosaurs You've Ever Seen". IGN . Retrieved May 5, 2023. Jurassic Park 4 Gets a Director (Hint: It's Not Steven Spielberg)". E! Online. March 14, 2013. Archived from the original on March 17, 2013 . Retrieved March 15, 2013. Jurassic Park IV Update". TheZReview.co.uk. June 12, 2002. Archived from the original on November 2, 2002.Knightley Confirms JP4 Talks?". CountingDown.com. July 14, 2003. Archived from the original on July 3, 2004. There were actually two roles in Jurassic Park IV Steven thought I might fit. First there was the granddaughter part, which wasn't all that big a role, she was only in it at the beginning. The other part he was considering for me was substantially larger, but I won't go into any details in case I make Steven angry (laughs). Frank Marshall On Eight Below, Indy IV and Jurassic Park". Empire. April 2006. Archived from the original on July 8, 2006.