Snorkeling Teen Finds Shark Tooth

David Wentz, 16, holds a fossilized shark tooth, Wednesday, March 26, 2008, inside his home in Port Huron, Mich. Wentz found the tooth while snorkeling with his brother Shaun, 21, off Marysville (Michigan) beach at the end of summer last year. (AP Photo/Times Herald, Melissa Wawzysko)

(AP) -- David Wentz was snorkeling off Marysville Beach in the St. Clair River last August when what he thought was an odd-looking rock caught his eye. "I didn't know what to think," the 16-year-old Port Huron resident said.

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