Sorry if I have offended anyone. I know I have pretty much raked Nasa through the coals here. However, these are just details of interpretation. I am thrilled at the overall incredible job that has been done here. I don't disagree that there is a water environment here that must show evidence of current at some level. I just think the examples they have used so far have been disappointingly weak, and they seen to have a bit narrow focus at times.

You may see fine layering with erratic cross bedding in the two following examples, or you might see intertwining segmented filaments. I propose the later, and that most of the other rocks with fine layering also generally have filaments along the edges of the layers, but less well preserved and intertwined.
Last Chance Front
Last Chance Left Side

I think a better case for cross bedding could be made for this rock (there is a better pic somewhere, cant find it now):
Flatrock Filter2
Flatrock Filter7
Flatrock-Mojo2 Close up
The large rock has enough of its side showing on the left to suggest that the layers are near vertical to the viewer. In the middle, it has a very flat layer that is angled up to the right compared to layers both above and below it. It makes a pretty high angle overall (5-10 degrees?). I would not expect a playa environment to have such a high angle. Perhaps this is more like a delta environment, such as the possible delta in Dr Malin's "Smoking Gun" evidence. I don't rule out evaporites, but I don't see evidence for subareal exposure such as ripples or aeolian deposits either (except the petrified dunes above the opportunity rock layer). Its easy just to criticise, but I hope I have offerred some alternative hypothesis and logical evidence here.