Switzerland: The millstone quarries in Mels (Canton St. Gallen), showing how rough outs were carved from the gritstone bedrock. This is a quarry with a history all the way back to the Roman period. Photo: Per Storemyr
Switzerland: The millstone quarries in Mels (Canton St. Gallen), showing how rough outs were carved from the gritstone bedrock. This is a quarry with a history all the way back to the Roman period. Photo: Per Storemyr
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Per Storemyr Geoarchaeology & Conservation 
