- last post: 01.01.0001 12:00 AM PDT
It's possible, I'll have to look up on asteroid, meteor and other celestial object chemical makeup.
Also if the plants are old eneugh (as in species wise, and locale wise), they could have come from plants that were affected by the blast and heat and had survived (I doubt this one though..)
I was thinking more along the lines of how the terrain though, how it would affect the sunlight in and out of the crater..