Before Adam - Jack London - Bog

A young man in modern America is terrorized by visions of an earlier, primitive life. Across the enormous chasm of thousands of centuries, his consciousness has become entwined with that of Big-Tooth, an ancestor living at the dawn of humanity. Big-Tooth makes his home in Pleistocene Africa, a ferocious, fascinating younger world torn by incessant conflict between early humans and protohumans.