Thanks for the direction - I began reading through the information - my initial thoughts (I must admit) are: O no, not another horse evolution sequence. I also noticed a fair amount of "making it likely", "it is known only from fragmentary skull remains" and "probably also had a tail fluke" kinds of phraseology.
I'll check into it a little closer later. Thanks.
The point is that we find things that fit. All of life appears to be in a nested hierarchy that evolves over time. The fossil record crushingly supports this conclusion as Darwin predicted it would (the record was much less complete 150 years ago). Millions of finds have failed to break the pattern of a nested hierarchy of being. But that is just one prediction of many. Take some time to think about these; many of these predictions are simultaneously impressive, easy to understand, and irrefutably correct, even though this wasn't known at the time the prediction was made.