Boasting archaeology dating from the end of the last Ice Age, the park contains the largest Iron Age hill-fort in the North of England, Roman Forts, castles and abbeys, moorland crosses and important early industrial sites.[15] Its ancient and varied geology includes the evidence left behind of ancient oceans, huge river deltas and great ice sheets. The evidence left behind by these events has brought geologists to the area for over a century, including figures such as William Smith, 'the father of English geology'. The area is also famous for its fossils, from ammonites to dinosaur footprints