Ammonites are perhaps the most widely known fossil, possessing the typically ribbed spiral-form shell as pictured above. These creatures lived in the seas between 240 - 65 million years ago, when they became extinct along with the dinosaurs. and textures
I love the natural feeling Andy has gave this picture. He has broken rocks almost perfectly through the middle to create a path. The white layer near the crack also make the picture even more appealing.