The oldest fossil classified as being in the Family Felidae (the true cats) is called Proailurus. These fossils appear from 20-30 million years ago.
The next step in cat history is called Pseudaelurus. It appears in the fossil record from 20-30 million years ago.
Some time after that there was a split between what we call the Subfamily Machairodontinae (the saber-toothed cats) and the Subfamily Felinae (the conical-toothed cats).
All modern cats are in the Subfamily Felinae, the conical-toothed cats.
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