Free high resolution photo of fossilized ripple marks. Ripple marks are a feature of sedimentary rocks formed where there used to be a beach or other water. This picture was taken at Dakota Ridge or Dinosaur Ridge near Morrison Colorado. It shows ripple marks in the Dakota sandstone layers. Great background, wallpaper, or texture image for a website, blog, computer, phone, scrapbooking or Photoshop. Free image for any use.