Some peculiarities on the way along the Delta

  

 

 Many "young" tectonic fault lines in the foreland of the Delta.

Tectonic fault line (not a channel)


Fragments from the eroded ash deposits of the delta

           

The rover is approaching the delta and has photographed more interesting details at sol-397. Surprisingly, a number of rounded stones have been documented, which normally signal activities
 of flowing water. A broken stone, however, allows a completely different conclusion. It is a hollow stone of two chambers filled with dust (?).
 
We can therefore assume that the rounded stones are volcanic geodes.


A closer look at these new photos suggests an assemblage of volcanic rocks such as laminated ash and remains of lava. Nothing is fluvial.




 

 
This laminar structured deposits clearly consist of volcanic ash particles


It seems to be lava


   


 

This is an enigmatic laminar structured ash ?
 

    
A small igneous ultramafic boulder


Another ultramfic rock on the way shows reflections or bright inclusions


 
Wonderful examples of coarse ash deposits
 


Another example of layered tiny-grained ash deposits

 

No chance to find fluvial sediments

 


These could be the basal ash layers of the eroded delta
 

 

  
This photo of the delta scap at sol 427 repeatedly documents a local unconformity over tilted ash deposits. Cross-bedding, as we know it in fluvial deposits, is not plausible.
 Rather, it can be assumed that there was a time gap during the spread of the dry ice glacier. The older tilted layer have a special cause.

 

Sol-453: Here are to see some vertical cracks caused by quakes
 

    
Now also is clear that the compact slabs above is also of ash.The holes are caused by wind erosion.

 

       
Sol-458: An impressive example with violent breakup of a non-sedimentary rock slab by tectonic activities ?

An isolated cairn with some eye-catching details


 
 


No.1. Lava again
 

No.2. A dusty rock with many gas pores ?
 

No.3+4. Bright mineral ribbons ?
(see page-3)