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 . DE LA CONDAMINE DISLOCATIONS AT ELACKHEATH from it by the presence of imiierfectly rolled flints which never occur in the tertiary bed Thus we have distinct line of demarcation between the Lower and Middle Eocene periods during which as Mr Prestwich has observed