Right after finishing The Clan of the Cage Bear I wanted to read this second book The Valley of Horses.
But for me it missed something. Ayla has left the people she grew up with and in search of The Others, but mainly she's just sitting in a cave, personally inventing all kinds of stuff. (It is almost as if she herself invents both the wheel and fire)
I thought it was a bit too much, I liked her better when she wasn't all this perfect.
As for Jondalar, I don't like him either.
The Valley of Horses is the second book in the Earth's Children series
Note: I read a Dutch translation of this book.