|Sea urchins and limpets in a tide pool.|
|This wall of perfectly fitted blocks cannot be of human manufacture.
It had to have been built by aliens.
There was a lot of that stuff flying around in those days. Yes, the wall was not built by humans. No, it was not built by aliens. It's a sill with columnar jointing.
Even though the structure is vertical, it is parallel to the structures in the rocks, therefore it's a sill.
Created 7 April 2003, Last Update 06 June 2020