Bulgaria-found bone markings are seen as the earliest example of human symbolic behavior.

The ancient bones, age calculated between 1.2 million and 1.4 million years, found in an excavation in Bulgaria have deliberate parallel markings quite resembling to a series of symbols.

These lines are unlikely to have been left from animal butchering, Jean-Luc Guadelli, of the University of Bordeaux, in France, told the BBC Tuesday.

The French and Bulgarian researchers, who have been excavating at Kozarnika site in Bulgaria, said the parallel cuts were too precise to be the result of hacking at the animal to strip away meat.

The new statement proves to be quite controversial, as many researchers believe the capacity to create symbolic features occurred more recently, about 50,000 years ago.

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