Hell Creek, Montana, USAWhere the Dinosaurs ArePaleontologist Jack Horner strides swiftly across the mountainous terrain overlooking Montana’s Hell Creek Formation. He knows these rugged hills well, having spent the past 11 years here unearthing the remains of Tyrannosaurus rex, Triceratops, and various duck-billed dinosaurs. On this hot summer morning, he is guiding four women under an unrelenting sun—initially along the main trail, then through ravines and down a steep gully. The group comes upon a patch of bones protruding from the clay, and Horner casts an expert eye. “Juvenile triceratops,” he says after a brief examination.
Exploring with Horner is part rugged outdoor workout, part evolutionary adventure, which helps explain why some 40 people trek to this remote part of Montana each summer to join him on his fossil hunts. This year’s team—mostly twentysomethings dressed in dinosaur T-shirts or sporting dino tattoos—has set up camp on a private ranch about ...