What does the fossil record – the observable, objective facts – tell us about these animals. The first – the sea reptiles – existed as more than 500 species and are found solely as fossils in sedimentary rocks that are dated, by conventional methods, older than 65 million years old. Young-earth creationists all agree these rocks formed during a global Flood. Hence, for the creationist, the evidence strongly suggests that the Flood caused the extinction of hundreds of species of great sea reptiles.