BRFelix, check out this small group of Mars' Craters
http://www.msss.com/moc_gallery/e01_e06/images/E04/E0400653.html
They are about half-way. What do you think. Was it created by an impactor that broke up right before impact. Was it created by internal forces like gases escaping?
I think I see some rays, which would mean it was created by an impactor.
