A Spinosaurus foot bone peeks out from red sandstone at the Moroccan dig site. The dinosaur fossil unearthed here is the most complete Cretaceous theropod ever found in North Africa. Described ...

But so far, not a single trace of dinosaur remains has been found in rocks younger than about 66 million years. At that point, as the Cretaceous period yielded to the Paleogene, it seems that all ...