I found what I guess is an Ammonite fossil in my garden. I was very excited about this before I knew what it was and that it is fairly common but still I was chuffed! I live about half a mile north of the Thames and know that this area was under sea water many moons ago.
Anyway what I noticed and am curiouse about is the markings on the back. I wonder how they got there?
The long markings on the back could just be scratches, but if they are part of the rock rather than scratches on the surfaces, they could be marks from the ancient burrows in the sea bed where the ammonite was fossilised. If there are small holes on the back, these are likely to be from modern boring organisms boring into the rock, things like sponges.