Final answer:
The Sevier Orogeny occurred during the Jurassic period, a geologically active era known for the rise of dinosaurs after a mass extinction event at the end of the Triassic.
Step-by-step explanation:
The Sevier Orogeny occurred during the Jurassic period. This was a time of significant geological activity, including mountain-building events. The Jurassic period spanned 56 million years from the end of the Triassic Period 201.3 million years ago (Ma) to the beginning of the Cretaceous Period 145 Ma. It was marked by volcanic activity and the mass extinction at the end of the Triassic that subsequently allowed dinosaurs to thrive during the Jurassic era.