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 . TAYLER CRYOLITE it is semicircular space of rather low to rl ii Sg bo si ' en is IS irregular ground surrounded by ridge of mountains rising abruptly to the height of about feet making the enclosed space appear the half of deep basin about two miles