[SunkenCiv]

IMO the world-wrapping mountain/fault lines came about with lunar capture, but there was an impact about 2 million years ago, and there must have been other impacts before and since.

The Eltanin Impact Crater
http://www.freerepublic.com/focus/bloggers/1248414/posts

Forests Frozen In Time
http://www.freerepublic.com/focus/chat/1321587/posts

Did a Pacific Ocean meteor trigger the Ice Age?
http://www.freerepublic.com/focus/chat/2933778/posts

off-topic post in another topic:
http://www.freerepublic.com/focus/news/825168/posts?page=31#31

Massive Eltanin Meteor 2.5 million years ago set off mass tsunami, changed the climate?
http://www.freerepublic.com/focus/chat/2937621/posts

Cosmic Impact Site That Created Earth’s Axial Tilt and Fault Lines
http://www.freerepublic.com/focus/bloggers/2639823/posts

ah, different impact:

Giant asteroid rocked Antarctica
http://www.freerepublic.com/focus/bloggers/1248406/posts

and lunar origin discussion:

http://www.freerepublic.com/focus/chat/1234919/replies?c=4

[RegulatorCountry]

I was looking at the large, central mountain range in that image of Antarctica, and seeing the rim of the two apparent large craters below them. The range is scalloped in two places. The larger of the two, to the right in the image, even has an obvious upwelling of impact debris in the center, or at least the reasonably convincing appearance of it from afar.

AFAIK, meteorite fragments and “slices” are astoundingly expensive and valuable. Drill down into the center of that upwelling and there's likely a large one, imho, protected all these eons by a thick coating of ice that seems to have been somewhat static, otherwise all those evident geological features would have been ground down substantially.