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siggjo_neolithic_rhyolite_quarry (8)

By | Published October 11, 2015 | Full size is 850 × 563 pixels

This is the rhyolite at Siggjo: fine-grained and banded. Photo by Per Storemyr

This is the rhyolite at Siggjo: fine-grained and banded. Photo by Per Storemyr

This is the rhyolite at Siggjo: fine-grained and banded. Photo by Per Storemyr

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