Mount Saint Peter
Around 1765 the skull of a "Mosasaurus" was discovered here in a limestone quarry, one of the first recognised reptile fossils, which was later acquired by the Teylers Museum in Haarlem. A more famous "Mosasaurus" fossil was found between 1770 and 1774 but was confiscated by the French in 1794 and is now in the Muséum national d'Histoire naturelle in Paris. Later dinosaur remains were discovered here as well, belonging to "Betasuchus" and "Orthomerus", as well as turtles and fossils of smaller creatures of the sea.
Jack Horner (paleontologist)
In Montana during the mid-1970s, Horner and his research partner Bob Makela discovered a colonial nesting site of a new dinosaur genus which they named "Maiasaura", or "Good Mother Lizard". The dinosaur bones, originating from a juvenile, were first discovered by Marion Brandvold. Horner then studied the bones, and at first, there was a refusal to return the bones to Brandvold. It contained the first dinosaur eggs in the Western hemisphere, the first dinosaur embryos, and settled questions of whether some dinosaurs were sociable, built nests and cared for their young. The discovery established Horner's career. He has named several other species of dinosaur (including "Orodromeus makelai," in memory of his late friend Bob Makela) and has had three named after himself: "Achelousaurus horneri", "Anasazisaurus horneri", and "Daspletosaurus horneri".
Within the paleontological community, Horner is best known for his work on dinosaur growth research. He has published numerous articles in collaboration with Berkeley paleontologist Kevin Padian, and French dinosaur histologist Armand de Ricqlès, on the growth of dinosaurs using growth series. This usually involves leg bones in graduated sizes from different individuals ranging in age from embryos to adults. Horner also revitalized the contested theory that "Tyrannosaurus rex" was an obligate scavenger, rather than a predatory killer. While this theory has been widely discussed by the popular press, it has never been a major research focus for Horner. He claimed that he never published the scavenger hypothesis in the peer reviewed scientific literature, stating that it was mainly a tool for him to teach a popular audience, particularly children, of the dangers of making assumptions in science (such as assuming "T. rex" was a hunter) without using evidence. In 2000, teams led by Horner discovered five specimens of "T. rex" and three more the following summer, including one larger than the specimen nicknamed "Sue". The new fossil was 10–13 tons in weight and 10% larger than other specimens. The Museum of the Rockies, as the result of continuing fieldwork, now exhibits the largest "Tyrannosaurus rex" collection in the world. Currently, Horner is working on the developmental biology of dinosaurs.