From the Wikipedia page 
The Heavener Runestone is an inscribed stone located in Heavener, Oklahoma. The land on which it sits is now a state park on Poteau Mountain, just outside the town limits. The origin of the stone's runic carvings is disputed.
The inscription has been rejected by Scandinavian philologists and runologists, who consider it most likely modern (19th or early 20th century). The reading of the "Elder Futhark" style runes is probably "GNOMEDAL" (meaning "Gnome Valley", or perhaps a personal name "G. Nomedal").
The difficulty of using the Heavener Runestone to demonstrate Viking exploration of the area is that the Elder Futhark had become obsolete by the 8th century, long before the Viking expeditions to Greenland and Vinland. Also, only six of the eight characters are correct Elder Futhark runes. A transliteration would read "G [rough backwards N] O M E D A [backwards L]".
The Heavener Runestone Park Wikipedia page is .
See also Poteau Runestone