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 . DIAMONDS IX SOUTH AFRICA were found in this drift Some localities have yielded immense quantities as Pniel Klipdrift The newer one or recent drift occupies the present river bed It differs in composition from the older drift in containing larger percentage of sandstone