Noclevername,

It's "crop fields", which are planted in soil deposited on top of the crater
by glaciers about 10,000 years ago. The crater is buried very deep.

-- Jeff, in Minneapolis

__________________
http://www.FreeMars.org/jeff/

"I find astronomy very interesting, but I wouldn't if I thought we
were just going to sit here and look." -- "Van Rijn"

"The other planets? Well, they just happen to be there, but the
point of rockets is to explore them!" -- Kai Yeves