Tuesday 15th January 2013 Sol 159

We are finding more veins and white nodules across the drill  target area (called John Klein) and in our surrounding area.  Chemcam shows that this is a calcium sulphate – perhaps gypsum or anhydrite.  This is further evidence for water at the landing site, though not in this case from flowing water at the surface like the conglomerates, but briney water exploiting cracks after the sediments had been laid down.  One of the striking things is the large amount of the veining.  We will be looking at changes in this sort of veining as we move towards Mt. Sharp to constrain the temperatures and fluid chemistry of the water associated with the veining.