http://en.wikipedia.org/wiki/Bosnian_pyramids#Other_interpretations
According to one source, on May 8, 2006, members of the Geological team investigating Visočica on behalf of the Archaeological Park: Bosnian Pyramid of the Sun Foundation held a press conference in Tuzla to present the results of their research. The academics, from the Faculty of Mining and Geology at the University of Tuzla and led by Professor Dr. Sejfudin Vrabac, concluded that the hill is a natural geological formation, made of classic sediments of layered composition and varying thickness, and that its shape is a consequence of endodynamical and egsodynamical processes in post-Miocene era.
According to Professor Vrabac, who specializes in paleogeology, there are dozens of like morphological formations in the Sarajevo-Zenica mining basin alone. The Geological team report on Visocica, based on the data collected in six drill holes at 3 to 17 metre depths, is supported by the Research and Teaching Council of the Faculty of Mining and Geology, as well as the Association of Geologists of Federation of Bosnia and Herzegovina.[15]