I am trying to find this out also.
I have tried a few cites and it says that it is really not known that well. There is very few amount of history on the horse I believe it was in the Precambrian era I am not sure though
Equus is the genus name for the modern horse and its close relatives. The first representatives of this genus arose roughly four million years ago. Thus Equus has lived during the Neogene and Quaternary periods of the Cenozoic era.
They first evolved in the mid to early eocene epoch as creatures about the size of a cat.
In Cenozoic era , during Neogene or Quaternary period
We live in the cenozoic era. The Quarternary period. Also in the 5th era.
The Cenozoic.
We live in the Cenozonic Era and the Holocene Epoch.
We live in the Holocene Epoch, of the Quaternary Period, in the Cenozoic Era
Cretaceous period
The Cenozoic Era.
The current period is the Quaternary. It began 2.588 million years ago. The Quaternary is the third geological period in the Cenozoic era.
Geologically speaking, we are in the Quaternary Period.
pre historic era
In Mesozoic Era .
Carnotaurus lived in the Cretaceous period of the Mesozoic era.