I am Geo Science Theme Lead today (Geo STL). Our top priority is to retake the APXS compostional analyses on the Buckskin drill tailings, as we missed first time around. This Navcam image shows APXS placed over the tailings on a flat rock surface.
The outcrop in front of us is called Williams. It has some striking crossbedding, probably due to the flow of ancient rivers into Gale Crater. However, ChemCam has shown us that there is a great compositional variation in this outcrop so we are going to spend an extra day here before driving off. A question is whether the compositional variation is due to remobilisation of elements by fluids or reflects variations in the source material.
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