Just a quibble, rosborne, but while smokeless gunpowder doesn't explode, it burns fast enough to fool most of us. Not addressing what happened with lightning in a high oxygen environment, you know. Just making the observation.
Thought this thread went the way of the mam moth. Evidence Ive seen re: post Permian involves occupation of the oxygen sites by iron banded formations and redbeds. The lightning in an O2 environment seems to need some "fleshing out". COurse, Im not staying current with my literature of late , but Im only guessing that, since lightning is a common ccurence and Ozone can be generated in excess by lightning striking and converting atmospheric Nitrogen into ozone, Im not so sure that there would be a depletion in the upper atmosphere.
So far the oxdiation of sulfur and iron by normal means along with the increased vulcanism of the post Permian can answer much of the "Big bug" anomaly.
