Columbia Hills layers Mars rover summary
I completed an overview of what we know about the layered volcanics at Husband Hill and West Spur. Basically the layers seem to have a southwesterly strike and a northwesterly dip. They're mainly volcaniclastics possibly draped by a layer impact breccia on the top of Husband Hill (Voltaire coutcrop). It probably won't be possible to correlate individual layers from hill to hill until the Spirit rover completes it's structural geology work from the summit of Husband Hill.
Anyways, hope people find the write-up useful.
Just click on the "Layered Volcanics" link on my homepage.
http://www.marsgeo.com/