Dinosaurs once roamed here. Their fantastic remains are still visibly embedded in the rocks. Today, the mountains, desert, and untamed rivers flowing in deep canyons support an array of life. Petroglyphs hint at earlier cultures. Later, homesteaders and outlaws found refuge here. You can see over 1,500 dinosaur fossils exposed on the cliff face inside the Quarry Exhibit Hall. The park also preserves traces left by earlier peoples who inhabited the area. Several petroglyph sites are easily viewed.