The superintendent of Woodlawn Cemetery in Elmira said today the 12-by-12-inch likeness of the American writer was likely stolen between Christmas and New Year's Day.
The plaque showing Twain's image was one of two on a 12-foot-tall, 78-year-old granite monument commissioned by Twain's daughter Clara. The other plaque, of Clara's husband, was untouched.
Twain was born Samuel Langhorne Clemens and grew up in Hannibal, Missouri.
The author of such classics as "The Adventures of Huckleberry Finn" and "Tom Sawyer" married Olivia Langdon of Elmira and had a summer home in the upstate city.