The Tubes [in Bulgarian]

Abstract

The tubes are cylindrical or conical cavities coming from the core to the surface of white sandstones, located not far from Belogradchik, in the skirt of Venets, the mountain of Belogradchik. Around and within the cavities one can observe dispersed metallic (Fe) particles. These strange formations were first discovered and announced to the public by the author of the present article. In his opinion they have an artificial origin.

Keywords

• Belogradchik rocks
• White sandstones
• Stone cavities (tubes)