re: The word: Thermophysical.
... Christensen mentions it in his paperregarding the "spherical granules" posted above.
As for the area itself, maybe a word such as, paleohotspot? Yes, must try to avoid genetic terms, esp. when there's dispute. :) Well, they did find traces of Methane over Arabia Terra/Meridiani.
I just thought of this scene right now when you mentioned crossbedding. Meridiani Planum is so flat and so open. The dune patters are low, long and steady.... like the crossbeds in a way.
If I remember right, the below image was taken when Oppy was looking to the WNW.
http://www.planetary.org/mars/images/mer_opportunity_panorama_sol70_3122x1020.jpg
Had to post it.