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Why Ammonoids Went Extinct at the End Cretaceous While Nautiloids Survived? GEO GIRL

Ammonites are beautiful & diverse fossilized mollusks! Unfortunately, the animal that created these remarkable fossils, ammonoids, went extinct along side the dinosaurs around 66 million years ago. Oddly, nautiloids, a very similar group of cephalopods, survived this extinction event and still exist today. The survival of nautiloids & extinction of ammonoids has puzzled many scientists given that, during their existence, ammonoids were much more diverse than nautiloids. Diversity normally makes animals more resilient during extinction events, but it did not save the ammonoids. Today, ammonite fossils are all we have left of these beautiful creatures, and in this video, I address the top 5 reasons ammonoids went extinct while nautiloids survived the KPg extinction event. References: Alvarez et al., 1980 (Extraterrestrial cause for the Cretaceous-Tertiary extinction): https://doi.org/10.1126/science.208.4... Klug et al., 2015 (Ammonoid paleobiology): https://doi.org/10.1007/978-94-017-96... Huber et al., 2002 (Extreme warmth during Cretaceous): https://doi.org/10.1130/0091-7613(200... Ward & Kirschvink, 2015 (A new history of life: The radical new discoveries about the origins and evolution of life on earth): https://amzn.to/43F5VyD Tajika et al., 2023 (Ammonoid extinction versus nautiloid survival: Is metabolism responsible?): http://dx.doi.org/10.1130/G51116.1 https://en.wikipedia.org/wiki/Ammonoidea https://www.nhm.ac.uk/discover/what-i... https://en.wikipedia.org/wiki/Evoluti... GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, & donate to support the channel if you'd like!) 0:00 Extinction Selectivity 0:46 K-Pg Extinction 1:18 What are Ammonoids & Nautiloids? 2:36 Ammonoid & Nautiloid Differences 4:40 Where/When Ammonoids & Nautiloids Lived 6:25 5 Reasons Ammonoids Went Extinct 8:37 Why Nautiloids Survived 9:17 Did Some Ammonoids Survive the KPg? 10:16 Were Ammonoids Inferior to Nautiloids? Hey there, Earth enthusiast! Check my favorite Earth-friendly products: Bamboo toilet paper: https://shrsl.com/3cvku Bamboo paper towels: https://shrsl.com/3cvkw Compostable tableware: https://shrsl.com/3cvkz Compostable trash bags: https://shrsl.com/3cvl0 Bamboo cutlery + straw! : https://shrsl.com/3cwfl Eco-Friendly Tote (great for grocery shopping!): https://shrsl.com/3cwfp Reusable straws + cleaning brushes (my fav!): https://shrsl.com/3cwft Eco-friendly laundry detergent: https://shrsl.com/3cwgo Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2 (Just click link, press get started, take the free C footprint quiz, then choose how much you want to reduce your footprint by donating to the C sequestration projects they're funding!) Non-textbook books I recommend: Oxygen by D. Canfield: https://amzn.to/3gffbCL Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I Life on young planet by A. Knoll: https://amzn.to/2RBMpny Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2 Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb Oxygen by N. Lane: https://amzn.to/3z4FgwZ Alien Oceans by K. Hand: https://amzn.to/3clMx1l Life's Engines: https://amzn.to/3w1Nhke Tools I use as a geologist/teacher/student: Geology field notebook: https://amzn.to/3lb6dJf Geology rock hammer: https://amzn.to/3DZw8MA Geological compass: https://amzn.to/3hfbdLu Geological hand lens: https://amzn.to/3jXysM5 Camera: https://amzn.to/3l6fGRT Carbon-neutral pencil bag: https://shrsl.com/3cvjv Carbon-neutral backpack: https://shrsl.com/3cvkc Disclaimer: Links included in this description might be affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel so I can continue to provide you with free content each week! And as always, let me know your topic suggestions in the comments down below!