There are 4 books in the The Saga of Pliocene Exile series. The newest book is The Adversary which came out in 1984.

1
The Many-Colored Land

Book cover of The Many-Colored Land

In the year 2034, Theo Quderian, a French physicist, made an amusing but impractical discovery: the means to use a one-way, fixed-focus time warp that opened into a place in the Rhone River valley during the idyllic Pliocene Epoch, six million years ago. But, as time went on, a certain…

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2
The Golden Torc

The Golden Torc

A small group journeyed through a time-gate into Europe's prehistoric past. Yet this supposedly unspoilt sanctuary holds two alien races locked in combat. In a world where the human-like Tanu have the upper hand, Elizabeth Orme soon encounters trouble. When they find she possesses rare mind powers, they want her…

3
The Nonborn King

Book cover of The Nonborn King

Following an immense cataclysm, Tanu civilization is in ruins. Now the humans who passed through the gate to prehistoric Earth can finally seek power. Aiken Drum names himself King, but faces great opposition. The Firvulag are hellbent on wiping out every group but their own. Felice Landry, possibly the most…

4
The Adversary

The Adversary
The rule of Aiken Drum, a human time-traveller from the twenty-second century, who has restored order following a catastrophe in the Pliocene Epoch, is threatened by the dwarfish Firvulag, who seek general annihilation