The following comment was found in a wood burning video that i was finally able to watch. If the details of the comment are correct,, then the next step in those experiments should be distributing an electrostatically responsive material one the areas of excavation. I will explain further below.
comment by: Furai Baka
"At the very ends of the burnmarks a tiny air arc forms which connects the charred parts with the saltwater layer. Heat from the charred parts and the arc creates a narrow dried out insulating zone around that the arc jumps across."
If an arc is actually jumping a gap between the carbon-charred area and the saltwater-layered upper surface,, then the same scenario is being created which produced at least two dendritic deposition areas in experiments conducted with CRT's in variations.
In 2007 i pointed out to Dave Talbott and the TBgroup that material was observed moving between the case of the CRT and the screen as power was cycled. That material formed hanging dendritic patterns.
In 2011/12, experiments prior to NPA showed that material accumulates against the wall of an object which carries a discharging current from a CRT surface to the discharge probe. Later in 2012 similar experiments showed that; if a gap existed in a discharge path, then an arc would jump the gap and material accumulation would occur in an inverted dendritic pattern.
Suggestions were made way before then that a potential difference between the floor and an upper level may set up a discharge gap under certain conditions and be unleashed during duststorms, creating and ongoing process of deposition. But that will be hard to verify, so forcing a discharge from an upper level seems the next practicable method to replicate deposition against the wall, providing an active material is added as a following step in the experiment.