Shatter cones are formed by the passage of the explosion shock wave through the rock. They are best preserved and identified in fine-grained rocks. These Shatter cones mostly in Shale

Since the impact event 2 Billion years ago, there has been about 10km of erosion (i.e. these structures were formed 10km beneath the surface) This is about the best example I've seen.

Compare with Sudbury in Canada Vredefort Pseudotachylite South Africa Pictures