>>13428319CORRECT!
research the Morrison formation. Its where the big wave of the biblical flood dropped all the dinosaurs. That is why you have megaladon sharks mixed with t-rex and other land creatures, etc.
>The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone, and limestone and is light gray, greenish gray, or red.