Paleontologist Richard Forrest measures the jaw bone of a fossilized pliosaur found on the southern coast of England in Dorchester, England Tuesday Oct. 27, 2009. A local council says the fossilized skull of a giant sea monster has been found off the southern coast of England. The fossil came from a pliosaur, a ferocious predator that lived in the oceans 150 million years ago. The skull was discovered in Dorset by a collector and measures 2.4 meters (8 feet) in length. The discovery was announced Tuesday. Scientists believe the creature would have been some 16 meters (52 feet) long.