Thanks for the quick responses to the fossil horse tooth mystery. It seems
that there was a large horse in pre-historic times but it became extinct
before the Conquistadores replenished them (and made human groups extinct
or nearly so).
--David K.

>
>Apparently some fossils of the genus Equus, which is a genus of modern
>day horses, were found in the Eocene.  This is the same fossil stratum
>as the 4-toed horses.
>
>Andrew D.
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