Is the Jezero Crater a landscape of an wind-eroded glacier moraine?

(and the delta is an eroding remnant of the moraine)

Norbert Brügge, Germany
Dipl.-Geol.
  

The hope that rover Perseverance's mission will find traces of life could bern not come true. The photos available so far from the mast- camera suggest that the landsscape in the Jezero crater is a wind-eroded glacier moraine, and the delta is the eroded remnant of the glacier moraine. The deposits in the delta are stratified, but contain a lot of boulders. Such boulders are abundant in the run-up to the delta. All boulders are remnants of the eroded part of the formerly larger delta. "Fresh" boulders are slightly or not rounded and do NOT indicate transport by running water. The moraine contains both dark and also bright (disintegrated) boulders that should come from above the crater. The stratification of the fine sediments in the delta can only mean periodic activities of the glacier. The fine parts in the moraine probably consist of grains from completely disintegrated boulders, mixed with the decomposed olivines,so as we be found the mix on the bottom of the crater. It could also contain a lot of volcanic ash. The different stages of disintegration of the boulders are an indication of the age of their entry into the moraine. The "fresh" boulders are part of the upper part of the moraine. In the sandy elevations in the crater, in which boulders of different ages are stacked, are almost completely missing the blown-out fine components of the moraine. Disintegration and bleaching of the boulders could have been caused by chemical processes in the glacier moraine.The glacier could have been mostly dry ice (frozen carbon dioxide).
The areas in the crater in which boulders are missing could have been deeper parts in the relief in witches the boulders are buried.

Conclusion: Dear colleagues, there was no lake that was 100 m deep ......and no cross-bedding can be seen at the scarp of the moraine. So far there is also no evidence of water that has flowed in the crater.

 

   
The zoom view of an isolated remnant of the delta shows partly evenly layered deposits
The numerous unrounded boulders along the eroded front edge of the delta are striking.





Edge of the delta in an eroding state









In the foreground type of "fresh" boulders from the already eroded part of the moraine


What an impressive photo. It exclude that this stack was created by running water or in a lake



This photo could lead the error that the erosion was caused by flowing water


A large broken slab of rock in a remnant of the moraine

   

  Fluvial cross-bedding in the delta is that NOT. This are secondary structures that were come by periodic ice pressure


A closer look of the moraine-slope

Holey boulder with former olivine phenocrysts

Sliding boulder has destroyed the stratification

Boulders on top of the moraine

 

Massive to layered deposited and consolidated material of previously unknown composition in mostly broken state