Petrified Forest National Park in northern Arizona, USA isn’t much of a forest right now, but back in the time of the dinosaurs, this flat prairie was covered in trees. The climate back then was much wetter than it is now, and streams and rivers flowed from a warm inland sea nearby. These trees, after their deaths, fell into the mineral-rich waters, becoming fossilized over the millions of years. Now they’re scattered all across the area, looking like strange elongated stones.
Photos are from autumn of 2008, on a day when I had the whole park nearly to myself.