[BR-Crater] how the new outline affects studying the crater

[Ian Kluft]

On Sun, Jan 25, 2009 at 03:47:56PM -0600, Scot Wilcoxon wrote:
> If the jointed columnar formation is taken as being the crater floor, 
> wouldn't any rock layers below that altitude be candidates for shock 
> effects?

Yes.  But do we know yet of any places where there's enough exposed rock
below them to look at?

Shatter cones (the only shock effects we can identify without an electron
microscope) would be well below ground after the impact.  Bob pointed out
at Crater Assault 3 that we would need to look for places where there's
exposure of what was previously underground.  Erosion and/or uplift would
expose them.

I'd like to prioritize our efforts toward the area we think is part of the
uplift ring because it already had elevation.  It only needs erosion to
expose the shatter cones.

Also, since the discovery of the 87km/54-mile ring, we can more easily see
where there was post-impact fault uplift on some mountain ranges.  So that's
how Pahsupp Mountain became a suggested destination - it may have both forms
of uplift.