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 . HAEKNESS JOINTINGS shales the latter highly indurated On the north side of this quarry the beds consisting of gritty rocks dipping at are iatersected by and joints nearly vertical but in some cases inclining somewhat to the east These and joints are on the whole