How Sharks Lost Their Buzzsaws, Anvils, and Spikes

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Thank you to CyberghostVPN for supporting Public Media. You can take advantage of an 83% discount, i.e. $2.03 per month + 4 months free by clicking on this link: https://cyberghostvpn.com/PBSEons Long before the rise of the great whites and hammerheads we know today, sharks and their cartilaginous relatives ruled Earth’s oceans and rivers in astonishing variety. It was the golden age of sharks. But why did sharks get so incredibly diverse and odd during this period, only to lose most of that diversity forever? Also, special thanks to Joschua Knüppe for providing those gorgeous faunal overviews of the Bear Gulch and Cleveland Shale formations! https://www.deviantart.com/hyrotrioskjan ***** PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons ***** Eons is a production of Complexly for PBS Digital Studios. Super special thanks to the following Patreon patrons for helping make Eons possible: Perseus Bluejay, John Hildebrandt, AllPizzasArePersonal, Hugo van den Hoek, Alex Hackman, Travis Bauer, John H. Austin, Jr., Stephen Patterson, William Sunderland, Karen Farrell, Melodie Chen-Glasser, Casey Hague, Mary Sammartino , rene fuqua, Gizmo, Jason Rostoker, Nicholas Arger, Kerry Conneely, Susan Freund, Mary Tevington, Jonathan Rust, Lea Nisay, Josh L, Eric Younge, Irene Wood, CalamityBangs, Beth K, Elyssa, Derek Helling, Mark Talbott-Williams, Willie, Brian Clubb, Beth-Ann Cheney, John D Elias, Nomi Alchin, A.B. Heckert, Yu Mei, Annemiek Arkema, IAmHere, Duane Westhoff, Hillary Ryde-Collins, Nquiztor, Wookiee Henderson, Albert Folsom, lyric1981, SKS PHD, Eric Edwards, Dan Caffee, Steve Hill, Nathan Paskett, Nick Ryhajlo, Betsy Radley, Jennifer Courtemanche, Stephanie Schlea, Jeff Graham, Ruth Orr, raus , Eric Franklin, Randall George, Walter Ray-Dulany, Lianne Lairmore, Sarah Grunow-Mau, Deanna Hernandez, John Celio, Aaditya Mehta, Kevin Lacson, Christopher Samuel, Collin Dutrow, Steven Kern 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 Instagram - https://www.instagram.com/eonsshow/ Bluesky - https://bsky.app/profile/pbseons.bsky.social #Eons References: https://docs.google.com/document/d/1Ib7vLFWMjMZJhfxgUljCwhti5OIH3TAp-AL4vyIGm0g/edit?usp=sharing