Pseudotachylite appears as black veins that solidified from deep rocks melted by friction during #earthquakes. Some examples marked in red. http://pic.twitter.com/RVoSYzzgTT
— Concord Geology (@CUGeology) June 5, 2017
via Twitter https://twitter.com/CUGeology
June 05, 2017 at 09:54AM
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