Find Your Park Activity Source: Adapted with permission by National Park Service. A park can be many different things to many different people. For many people, Canyonlands National Park is a favorite showcase of geology. In each of the park’s districts, you can see the remarkable effects of millions of years of erosion on a landscape of sedimentary rock. The Green River has carved a channel out of rock layers deposited nearly 300 million years ago creating an open book for earth science enthusiast of all ages. [Read More]