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The vertical lines represent the actual time ranges of equid genera or clades.
For example, a thoroughbred is a type of a horse, which is an equid , which is a mammal and so on.
Hippidion was so distinctly different from other horses that it was considered to have diverged from the equid lineage about 10 million years ago.
It is the closest living relative of the domestic horse, and despite a difference in chromosome number, the two species are the only members of the equid family still capable of producing fertile offspring if interbred.
The equid and mammoth remains came from the upper unit and the mastodon and edentate material came from the middle unit.
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