Brought back for its fourth year running, our popular annual wall calendar showcases a varied and beautiful photo tour around the state. We’re excited to share this next collection of photographs from our talented CGS staff members (both current and former). Designed to keep you visually “in-the-know” on colorful Colorado geology, it reveals special locations throughout the year with the changing of the seasons. Consider ordering one for yourself, or give as a unique gift. You can order your calendar for $15 on our Amazon storefront Cover of the 2026 CGS Geology Calendar. Porcupine Cone, West Elk Wilderness, Gunnison County. Photo credit: Andrew Giebel (CGS). Calendar drafting and design by Larry Scott (CGS). Crystal Mill, Gunnison County (June, 2026 CGS Geology Calendar). Photo credit: Jonathan Lovekin (CGS). Columnar jointing in igneous rocks, Moffat County (October, 2026 CGS Geology Calendar). Photo credit: Larry Scott (CGS). Costilla Crossing Bridge over the Rio Grande (April, 2026 CGS Geology Calendar). Photo credit: Nate Rogers (CGS). Header photo: The Flatirons, Chautauqua Park, Boulder, CO. Photo credit: Orna Buch-Leviatan (CGS).