A cikin 2006 ƙungiyar masu bincike da Ralph von Frese da Laramie Potts ke jagoranta sun yi amfani da ma'aunin nauyi ta hanyar tauraron dan adam na NASA GRACE don gano ramin Wilkes Land mai nisan mil 300, wanda wataƙila ya samo asali kimanin shekaru miliyan 250 da suka gabata. Tambaya: Yaya tsawon lokacin da aka kafa craters?
Shekaru miliyan 250 da suka wuce.