This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Quarterly journal of the Geological Society of London . TEALL OX THE lIETAMOPvPHOSIS OF Witli regard to the development of foliation the evidence is very satisfactory The transition from crystalline granular rock to perfectly typical schist may occur in the space of an inch The specimen figured fig was accidentally fractured