re: Take a look at the APXS data for Ebenezer and Clovis.
Thanks for the link to the great image.
It reminds me of an irritation of mine that none of the deeper craters at Gusev were explored. It's been concluded that water altered material in the plains, i.e., aside from the Hills, is covered by basalt. My view is that such materials would have been seen if these deeper craters were explored.
Bob