File:Dolerite-porcellanite Contact - Geograph.org.uk - 472788.jpg
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current | 22:00, 4 February 2011 | 640 × 427 (310 KB) | GeographBot | == {{int:filedesc}} == {{Information |description={{en|1=Dolerite-porcellanite Contact This is one for the geologists. The black rock is the hard porcellanite which was used to make axes and tools, and the brownish rock above is the dolerite. The hammer i |
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