A controlled blast sprung a layer of limestone loose from shale, and scattered chunks of rock bearing a detailed impression of an ichthyosaur fin across the site. According to Lindgren and his colleagues, the fossil is the first-ever soft tissue impression found from Temnodontosaurs. Plus, strategic stealth may not explain everything about the fossil fin. Schmitz says It’s possible the unique features were driven by something more direct: speed and maneuverability. Now that these soft tissue features have been identified on one ichthyosaur, paleontologists can revisit other fossils to see what’s potentially been overlooked.