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Reference
20170033_0026
Chert ou chaille découverte en Ontario, au Canada et datant de 1 900 millions d'années
Chert discovered in the Gunflint formations at Schreiber Beach, in Ontario, Canada. This 15-cm rock dates back 1900 million years. It belongs to the Molecular Biophysics Centre (CBM) rock collection, a unique collection of terrestrial rocks and minerals, some dating back several billion years.
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