Mammoth by John Varley

Not content with investing his fortune and watching it grow, multibillionaire Howard Christian buys rare cars that he actually drives, acuires collectible toys that he actually plays with, and builds buildings that defy the imagination. But now his restless mind has turned to a new obsession: cloning a mammoth…

In a barren province of Canada, a modern mammoth financed by Christian has made the discovery of a lifetime: an intact frozen wooly mammoth. But what he finds during the painstaking process of excavating the huge creature baffles the mind. Huddled next to the mammoth is the mummified body of a Stone Age man around 12,000 years old. And he is wearing a wristwatch.

It looks like Howard Christian is going to get his wish-and more….