One of the great mysteries of the ancient past lies within a small quarry in the American southwest, and concerns a carnivorous dinosaur, coelophysis, that was no bigger than a large dog. More than a thousand fossilized remains have been found, and evidence suggests that ten times that amount may still be buried. Why are there so many of these little dinosaurs in one small area? The author of this work discusses the 40-year-old history of the excavations at Ghost Ranch, the quarry in Northern Arizona where these remains were discovered, and the million-year-old prehistory of coelophysis. A series of photographs and illustrations, accompanied by George Colbert's detailed maps, chronicle the search for the truth about coelophysis. A colour insert features the panoramic paintings of Margaret Colbert, giving readers a visual approximation of the prehistoric world.