the Spinosaurus roamed during the Cretaceous period and could exert a force of 4,200 lbs per square inch. This is similar to that of the modern Nile crocodile Spinosaurus speed is 15mph Spinosaurus, which was longer and heavier than Tyrannosaurus, is the largest known carnivorous dinosaur. It possessed a skull 1.75 metres (roughly 6 feet) long, a body length of 14–18 metres (46–59 feet), and an estimated mass of 12,000–20,000 kg (13–22 tons).