These shark teeth are from California's famous Sharktooth Hill, a tract of marginal rangeland near Bakersfield that was a richly productive shallow sea in the middle Miocene Epoch. A paper in the June 2009 Geology explains the factors that led to this great fossil bed.
Coins like the 19-millimeter U.S. penny are easy to use for small objects. But not everyone in the world is American. (more below)
Photo (c) 2007 Andrew Alden, licensed to About.com
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