PBS Eons has a new episode. This one is about the “Age of Sharks” or should it be the “Age of Weird Sharks”.

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