Prehistoric giant shark discovered 290 million years ago in

History of Sharks: Earliest Ones. Dinosaur-Era Ones and Megalodon

In the late Devonian the sharks Stethacanthus and Cladoselache try to avoid becoming lunch for a much bigger arthrodire fish (by raptoryx13) : r/Naturewasmetal

Researchers find 'Queen of the Ocean' ancient great white shark off Nova Scotia coast

Prehistoric Megafish Ate Ocean's Tiniest Critters : NPR

New 326-Million-Year Old Shark-like Fossil Species Named

What is the largest extinct shark? - Quora

For the Belt and Road--Seetao

Rare and 'horrific': Frilled shark startles fishermen in Australia

Megalodon: The Biggest Shark To Ever Live

Giant Sharks Through Time, Maduro Dive