Back for the third year running, our popular annual calendar showcases a varied and beautiful photo tour around the state. We’re excited to share this next collection of photographs from current and former CGS staff members. Designed to keep you visually “in-the-know” on colorful Colorado geology, it reveals special locations throughout the year! Consider ordering one for yourself, or give as a unique gift. You can order your calendar on our Amazon storefront 2025 Colorado Geology Calendar Cover. Photo credit: Orna Buch-Leviatan for the CGS. “The Purgatoire River Tracksite is associated with strata of the Morrison Formation. This geologic strata, dating from the Late Jurassic Epoch—about 150-million years ago—is one of the most famous dinosaur-bearing deposits in the world, containing well-known fossil sites such as Dinosaur National Monument.” –Excerpt from Dinosaur Lake: The Story of the Purgatoire Valley Tracksite by Martin Lockley. Photo credit: Jeremy Boak for the CGS. Royal Gorge, carved by the Arkansas River over the course of 3 million years, is a 1,250-foot-deep canyon in Precambrian rock west of Cañon City. Spanning the gorge is the Royal Gorge Bridge, once the world’s tallest suspension bridge, with a length of 1,260 feet and standing about 1,000 feet above the river. Photo credit: Larry Scott for the CGS. This view from Mueller State Park shows the eastern side of the Sangre de Cristo Mountains in the distance. The Laramide Orogeny from the Late Cretaceous into the Eocene epochs resulted in today’s prominent topographic relief. These mountains are influenced by the Rio Grande rift on their western side, where normal faulting still impacts the area today. Photo credit: Jonathan Lovekin for the CGS. Header photo: Wolf Creek Pass overlook. Photo credit: Nate Rogers for the CGS.