Agriculture can't be traced back further than 9,400 BC? what makes SLATE's reviewer think that

a.) There are no remains that haven't been found yet, that indicate that agriculture goes back further than 10,000 BC, and that

b.) "10,000 BC" is close enough to 9,400 BC for a movie title?

And as for the fact that we do't know of any pyramids that size that can be traced back to 10,000 BC, what if the movie depicts one of the civilizations that was drowned by the melting of the Ice Age ice caps about 10,000 years ago? (I forget exactly when the Straits of Gibraltar were supposed to have burst open, flooding an amazingly wide area of what had been the Mediterranian shore in a short time.)

The thing is, while the movie is probably just a politically-correct fairy tale we can't be completely certain about the way things were back then.