This is Reader's Digest prehistory, though at least director Chapman (cameraman on Raging Bull) makes sure the murky caves look nice.

The filmmakers made no effort to empathize with their prehistoric characters, to imagine what it might have really been like back then.

A goofy and ill-made movie that wants to be deadly serious and acts incredibly daft, and the average between these two points is of a joyless, dull nothing.

As the cave wall says, stay with the book.