Other minerals can also enter the bone while it is buried and help to preserve it. Some dinosaur bones are easier to break than our bones, as the way they have been fossilised can often leave them very brittle. At Inverloch, the dinosaur bones are often so soft that you can break them just by touching them. That is why when we find fossils, often all we find are the teeth and bones. Some dinosaurs are pictured as having horns.
Horns do preserve, as they often grow on bony protrusions of a skull.