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 . KEADE ON THE DEIFTBEDS OE THE compact bine Till full of scratched Carboniferouslimestone boul ders and pebbles Fig Section in the left bank of the Calder near Cock Bridge Surface of water Hard compact blue Till Sand mixed with blue clay Boulderbed The limestone