re: Take a look at the APXS data for Ebenezer and Clovis.
High in chlorine, potassium, and bromine. Looks like a rock exposed to salt water.
It's beginning to look promising for the Spirit team. They're seeing more of these types of rocks as they travel further south towards Maadim Vallis.
If those are the typical colors used for topography then it looks like there's a dip in elevation just before the Columbia Hills at Spirit's site. Not that it makes any difference, but it would if there was sloshing water onto the hills at one time.
Tetl looks like something you'd might find at Oppy's site.
