[https://edition.cnn.com/travel/article/grand-canyon-cliff-collapse-fossil-footprints-scn-trnd/index.html](https://edition.cnn.com/travel/article/grand-canyon-cliff-collapse-fossil-footprints-scn-trnd/index.html) Finding fossil footprints at the Grand Canyon isn't particularly unusual. The expansive stretch of red rock is home to an array of formations containing preserved remains of the past. geology professor find the oldest vertebrate fossil tracks ever found at Grand Canyon National Park -- about 313 million years old.