the image is a back button

Geological map, colour lithograph, Geological Map of the British Isles, by Archibald Geikie, published by W and A K Johnston, Edinburgh and London, 1879. (Geikie 1879)
You can open the stratigraphical column in a new window to use with the map. You have to close this new window by hand
button   stratigraphical column.

button to lakes menu   Lakes Guides menu.