Image: Dolerite-porcellanite Contact - geograph.org.uk - 472788
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Description: 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 is for scale.
Title: Dolerite-porcellanite Contact - geograph.org.uk - 472788
Credit: From geograph.org.uk
Author: Anne Burgess
Usage Terms: Creative Commons Attribution-Share Alike 2.0
License: CC BY-SA 2.0
License Link: https://creativecommons.org/licenses/by-sa/2.0
Attribution Required?: Yes
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