Describes the formation and characteristics of igneous, metamorphic, and sedimentary rocks and how to recognize and collect them.

The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest.

"The year is 1876. Warring Indian tribes still populate America's western territories even as lawless gold-rush towns begin to mark the landscape. In much of the country, it is still illegal to espouse evolution. Against this backdrop, two monomaniacal paleontologists pillage the Wild West, hunting for dinosaur fossils while surveilling, deceiving, and sabotaging each other in a rivalry that will come to be known as the Bone Wars. Into this treacherous...