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The Conglomerate Rock of the Ravne Tunnels

Richard Hoyle, Bosnian Pyramid of the Sun Foundation Geologist

Introduction

The Ravne conglomerate is a rock unit located on the outskirts of the central Bosnian city of Visoko, 25km northwest of the Bosnian capital, Sarajevo. The conglomerate is confined to a small area near to the flood plain of the River Bosna, the namesake of Bosnia. In 2005, the deposit was identified as a site of geoarchaeological significance when Anthropologist Dr Sam Osmanagich discovered a subterranean network of prehistoric tunnels cutting through the interior of the rock unit. The tunnels, which run for 10’s of kilometres underground, offer a unique opportunity to step inside a rock to observe the interior structure of a geologically recent gravel bed.

Last modified on Tuesday, 26 January 2021 16:46

2018-05-172018-05-17ENTRANCE TO UNDERGROUND LABYRINTH RAVNE LIVE STREAM

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Video clip from Visit to Bosnian Valley of the Pyramids 2014

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