The red marker on the original image probably is the site of this X shaped marking on the top of the western dark region of the “skull” - OP probably assumed the X was the four edges of a pyramidal shape but this 3d Google Earth view from the western “eye” toward the eastern one shows that the X shaped region is flat and not pyramidal.
Edit: probably someone did some mining up there? Or a natural feature? Who knows, let me know if you go check for sarcophagi to prove me wrong
Out of curiosity, what is it?
“Trou au Natron” seems to translate from Fr*nch to “salt pit”. It’s probably a crater full of salt from an evaporated sea.
I should have just !wiki’d it. https://en.m.wikipedia.org/wiki/Trou_au_Natron
I was partially correct. Natron salt in a volcanic caldera from active hot springs.
The red marker on the original image probably is the site of this X shaped marking on the top of the western dark region of the “skull” - OP probably assumed the X was the four edges of a pyramidal shape but this 3d Google Earth view from the western “eye” toward the eastern one shows that the X shaped region is flat and not pyramidal.
Edit: probably someone did some mining up there? Or a natural feature? Who knows, let me know if you go check for sarcophagi to prove me wrong