QUOTE (Sunspot @ Jun 5 2009, 07:24 AM)
Very very cool!
There's some really neat stuff going in in the upper right where it looks like the fluid flowed along, punched through into a crack and just soaked into the surface! (Note where the channel hits a crack and the walls are no longer evident on what should have been the downstream side of the gap.)
BTW, the tapered forms on the left side of the crater seem to indicate that the surface flow was running left to right (downgradient) before the impact, and that the impact just got lucky and smacked into the middle of the channel.
I think the main channel existed before the impact. (But the impact generated another round of fluid stuff as seen in the debris apron)
I really love this image.
Here's my take on what could be going on:Click to view attachment
(And yes, past surface flow on a sediment-covered glacier seems like a possibility)