...make the foolish step of replying in reasoned terms to an unreasoning loon who has already demonstrated the inability to read, to think, or to learn, over the space of his past 2 posts, at least.

> "Mars lacks the volcanism for round gas pockets to form, and there is no other spherical mechanism except for impact condensate."

Well, excuse me, EP, but AT THE TIME that the meridiani deposit formed, Mars had ample volcanism. Even if that were not the case, there are other ways to make round objects - concretions for one,

> The size distribution is so limited "Because Mars' atmosphere and gravity are constant"

Well so is the Eath's, but terrestrial tektites are widely variable in shape, & size, even for a single impact.

> what is the source of the haematite? "Any iron impactor"

If you knew anything about impactors and impact condensate you might be aware that:

Haematite is an iron oxide. To make it from iron, you must add oxygen.

On Mars, the only source of that is the CO2 in the atmosphere. Where is the associated reduced carbon?

Anyway, on Earth, volatalised iron does not oxidise in the much higher oxygen fugacity (partial pressure) of our atmosphere. - For instance, the Canyon Diablo Iron meteorite produced a shower of mm-sized particles from its ablated surface. These are nickel-iron in composition, unoxidised. You can trawl around meteor crater Az or the eponymous Canyon with a magnet and find a whole bunch of these in the gritty soil.

And before you finish, can you cogently differentiate between an impact condensate formed from "hot impact dust", one formed from molten material, and one formed from vapour.

Plus, you might care to address the lack of blueberry-rich layers. It's kind of fundamental...