A cave near Sitovo

This impressive inscription was made about 6,500 years ago on the wall of a cave near Sitovo (next to Plovdiv, Bulgaria).
The written signs are in two lines and each row is 3,4 meters long. The signs are 40 cm. tall. You can distinguish many signs of the Old European Script .
In the cave itself, besides the inscription, Neolithic ceramics was found as well with characteristics of the Vinca group.

References:

Merlini M., Was Writing Born in Europe? Searching for a Sacred Script, Rome (in preparation)
Todorovic J., "Written signs in the Neolithic cultures of Southeastern Europe", in Archaeologia Iugoslavica, X, Societas archaeologica Iugoslaviae, Beograd, 1971