Recounts the life and fossil discoveries of Barnum Brown, the paleontologist who, in 1908, discovered the largest and most complete Tyrannosaurus skeleton that had ever been found.

Tells how two amateur paleontologists, an English doctor and his wife, found a fossilized tooth that led to the discovery of a large species of dinosaurs known as Iguanodons.

Describes the efforts of Roland Bird to investigate footprints left in various sites across the American Southwest by dinosaurs millions of years ago.