Inside the Deadliest Ocean in Earth’s History

Few places in Earth’s history combined such extraordinary abundance and constant danger as the vast inland sea that once split North America in two. 🌊🦈 Journey back to the Late Cretaceous and discover the Western Interior Seaway, a lost ocean filled with giant mosasaurs, powerful sharks, enormous predatory fish, diving birds, flying reptiles, sea turtles, ammonites, and countless other creatures that shared one of the most competitive marine ecosystems ever known. Along the way, we'll uncover how warm greenhouse climates helped create this shallow sea, why oxygen-poor seafloors preserved remarkable fossils, how paleontologists reconstruct ancient food webs from bite marks and stomach contents, and what the fossil record reveals about life, death, survival, and extinction in a world unlike our own. From microscopic plankton drifting through sunlit waters to apex predators ruling the open sea, every creature was connected through a complex web of feeding relationships that evolved over millions of years. Yet even this thriving ecosystem would eventually face dramatic environmental changes before disappearing during one of the most famous mass extinctions in Earth's history. 🔎 Topics covered: • Western Interior Seaway • Mosasaurs and marine reptiles • Cretoxyrhina and ancient sharks • Xiphactinus giant predatory fish • Pteranodon and Hesperornis • Ammonites and marine ecosystems • Fossil evidence of predation • Cretaceous greenhouse climate • Chicxulub impact extinction • Evolution and ancient food webs If you enjoy deep-time science, prehistoric oceans, fossil discoveries, and relaxing educational documentaries, this journey is for you. 👍 If you enjoyed the video, please like and subscribe for more calm explorations into Earth's distant past. Become a supporter of this podcast: https://www.spreaker.com/podcast/snoozy-science--7446878/support . This episode includes AI-generated content.