Image: Gnaisse Sete Voltas - Bahia - Brasil
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Description: Gneiss Sete Voltas sample, the oldest rock outcropping in the crust of South America, circa 3,4 billion years old. On display at Instituto de Geociências, University of São Paulo, Brazil
Title: Gnaisse Sete Voltas - Bahia - Brasil
Credit: Own work
Author: GeoPotinga
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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