Cathedral Mountain is a freestanding sandstone monolith in Capitol Reef National Park’s remote Cathedral Valley, rising prominently above the valley floor. An erosional remnant, it was left standing as surrounding rock wore away. The valley was named in 1945 by Charles Kelly, who thought its towering sandstone forms resembled Gothic cathedrals. John C. Frémont’s 1853 expedition passed through the area. The mountain is composed of Entrada Sandstone capped by the harder Curtis Formation, helping resist erosion. Its rocks formed about 160 million years ago on a tidal flat in the Jurassic, while the broader landscape was later shaped by uplift of the Colorado Plateau and the Waterpocket Fold.