My post:
Could we be looking at a dry lakebed or flood plane?
It seems like if sediment is suspended in water during a "cyclic", "annual" or seasonal flooding (melt) it would settle out and be uniformly deposited like the layers in the image.
There is also something about the layers that distinctly separates them physically from other layers. They break off in 'shelves'. What If the lake had a chance to dry out between flooding? Could the hardening of the previous deposit account for the slip plane between it and the next deposit?
jms’s reply:
"Wind is very effective at sorting sediements. In a modern sand dune one can observe sets of sediemenary layers at this scale. …. This is what I think is causing the layers…I don't think there was all that much "flooding", per se. Sure, a desert playa on earth has periods of a small amount of flooding then dries out. But I think this is more "wetting" where the water table rises, or water is constantly wicking to the surface through evaporation."
Now “Some thoughts†by jms. "Could it have been a "sea" that evaporated down to a brine, then had a period of drying and wetting before all the water was gone?" "Perhaps lake is a better term to use than sea which is better than ocean." The samples I based my assumptions on were different from Nasa’s- But come on- aren’t they in the same crater? Isn't likely they were formed in the same manner? I think I nailed it. And not a peep from anyone. Not even a “good guessâ€. That’s fine, maybe y’all don’t read my posts but after discussing this with him, I find it flat inexcusable for our newly arrived “geologist†to do 180 on the subject without the slightest nod in my direction. What does Bowser call it- Intellectual Integrity? I
Could we be looking at a dry lakebed or flood plane?
