(and the delta is an eroding remnant of the moraine)
Norbert Brügge, Germany
The hope that rover Perseverance's mission will find traces of life will 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 this 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 "fresh" and disintegrated boulders that shoulded come from above the Jezero 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 were 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).
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.
Elevations with partly phenomenal boulders