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 . PROCEEDINGS OF THE GEOLOGICAL SOCIETY Feb This Crab rock as seen in the section is in some parts twenty feet thick but its thickness is very irregular as it spreads over the eroded edges of the Carboniferous Limestone It is seen not only reposing unconformably upon