In 1985, hikers in the mesa country near Albuquerque, New Mexico, found enormous bones later identified as a new species of dinosaur, Seismosaurus , meaning "earthshaker," a reference to the size of a 50-ton Jurassic Period creature. Paleontologist David Gillette gained the opportunity to name the newly discovered remains, but he and others were also challenged to remove them without damage. Absorbing reading about sophisticated technology linked with continuing study is expanded by color photos of field excavations and an artist's reconstructions. (Ages 5-10)