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Some peculiarities
on the way along the Delta
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Many
"young" tectonic fault lines in the foreland of the Delta.
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Tectonic fault line
(not a channel)
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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.
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This laminar structured deposits clearly
consist of volcanic ash particles
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It seems to be lava
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Cyclically deposited ash layers
of varying hardness and modeled by wind erosion
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A small igneous ultramafic boulder
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Another ultramfic rock on the way shows reflections or bright inclusions
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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
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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 and tilted block was caused by an other
szenario (Transport ?).
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Sol-453: Here are to see some vertical cracks caused
by a transport of the blocks
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Now also is clear that the compact slabs
above is also of ash.The holes are caused by wind erosion.
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Sol-458: An impressive example with cracks in
a non-sedimentary rock slab caused by movement energy.
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