Group of visitors at the entrance to the Nachtigallstollen, tour guide, GeoRoute Ruhr, Dünkelberg quarry, in the Muttental valley, here you can see th
Group of visitors at the entrance to the Nachtigallstollen, tour guide, GeoRoute Ruhr, Dünkelberg quarry, in the Muttental valley, here you can see the geology of the region, a thin seam of hard coal is visible, underneath were thicker layers of hard coal that were mined, Witten, NRW, Germany,
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Photo credit: © Jochen Tack / Alamy / Afripics
License: Licensed
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