Thanks for playing, Michael! You guessed that the fossil in the Friday Fossil Guessing Game was of a mastodon tooth. It is indeed the tooth of a Columbian mammoth (story). You win this
lovely interesting cobbled-together banner! You can just enjoy its niceness, or you can post it on your website. Or tile it as your desktop background. No, I'm not holding my breath for you to do that. Oh, and if you're not Michael, check out his blog "The Deeps of Time," to which I subscribe.
Should I impose more contests, trivia games, and such on the blogosphere? Because I can't be serious all the time, and I am inclined to keep occasionally doing these things.