You can see how the animals get larger as time, and presumably evolution, goes on. Initially the animal was about the size of a dog but ends up being much bigger.
Also the bones of the fore leg change from being three separate bones into being one large bone with the hoof of today's horse on the end.
However fossils are 'flukes'. We have only got fossils when an animal or plant died, fell into a suitable substance and then didn't decay quickly.
Most animals or plants at that time would have died where they would decay quickly. In that case we would have no fossil!