The sod thing has always been odd, my guess is freezing, And static Distraction.
Its not only the Dust thats odd, the shapes of some of the conglomerates that seem to form attached to soil layers, these are very bio looking.
I ,made some images trying to see how the soil layers are formed, and they seem to be very disconjointed, small wafers, as compared to large, even layers. as seen in this cross at the edges of the trench.
the lack of any real details of the mission, even though they said they would open up, is agreat saddness. This is even wourse that the rovers by far.
The stain,seens on the right, would be worth putting some time into, along with the odd conclomerate seen in the lower left corner of the trench.
the spoils pile is starting to get some tid bits scattered about, specialy another odd conclomerate.
for anaglyphers