Project Mastodon

Project Mastodon is a sci-fi story by Clifford D. Simak. What if time travel was achieved by a group of civilians, without any assistance from government or industry? What would you do if you could go back by some 150,000 years, to a time when mastodons and saber toothed tigers roamed North America? A humorous, and twistedly ironic story of time travel and it's repercussions!