Flagstaff, AZ – So many pages of geological history lie wide open at the Grand Canyon; it's hard to know where to begin reading. And it's even harder when it comes to the fine print. Flagstaff writer Scott Thybony brings us his latest commentary from deep within the Grand Canyon. Scott Thybony is a Flagstaff based writer. To see a slide show of the ancient tracks he found in the Canyon visit our Web site KNAU dot org. His Grand Canyon commentaries are funded by the Grand Canyon Association, supporting education and scientific research for Grand Canyon National Park since 1932. On the web at Grand Canyon dot org.