The Bat Creek inscription (also called the Bat Creek stone or Bat Creek tablet) is an inscribed stone collected as part of a Native American burial mound excavation in Loudon County, Tennessee, in 1889 by the Smithsonian Bureau of Ethnology's Mound Survey, directed by entomologist Cyrus Thomas . The inscriptions were initially described as Cherokee, but in 2004, similarities to an inscription that was circulating in a Freemason book were discovered. Hoax expert Kenneth Feder says the peer reviewed work of Mary L. Kwas and Robert Mainfort has "demolished" any claims of the stone's authenticity. Mainfort and Kwas themselves state "The Bat Creek stone is a fraud."
In a 1991 reply, archaeologists Robert Mainfort and Mary Kwas, relying on a communication from Semitist Frank Moore Cross, concluded that the inscription is not genuine paleo-Hebrew but rather a 19th-century forgery, with John W. Emmert, the Smithsonian agent who performed the excavation, the most likely responsible party.
Mainfort and Kwas published a further article in American Antiquity in 2004, reporting their discovery of an illustration in an 1870 Masonic reference book giving an artist's impression of how the Biblical phrase "holy to Yahweh" would have appeared in Paleo-Hebrew, which bears striking similarities to the Bat Creek inscription. They conclude that Emmert most likely copied the inscription from the Masonic illustration, in order to please Thomas with an artifact that he would mistake for Cherokee.
More information, including a bibliography, on the Wikipedia page