Jean M. Auel wrote The Valley of Horses. The Valley of Horses has genre Historical novelThe Valley of Horses has genre Speculative fiction
[Human]: Could you recommend other authors similar to Jean M. Auel? [Assistant]: Jean M. Auel wrote The Valley of Horses, which is historical fiction.  Do you like this genre? [Human]: Somewhat. Are there more books in The Valley of Horses series? 
You can check out The Clan of the Cave Bear, in the same series.  Have you read it?