Cообщение Кристиана Клайника от 17.01.2018 со ссылкой на:
Geologic map of Mauritania (2015) 1:1000000.
"I have found an potentially complex impact structure in the Tagant plateau.
This structure is deeply eroded, possible age Upper Ordovician or younger" (Krisztian Klajnik, 2018).