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Fw: extinction6

> > 1. SO2 from the object.
> > A group of meteorit containts FeS and Fe2C but only a few percents. This
> > isn't enough to produce 500 Gt SO2.
>
> Indeed not. But the impact site is composed of thick layers of dolomite
> and... anhydrite (CaSO4 x 1/2 H2O).
That's hemihydrate, not anhydrite (CaSO4), Minerology was one of my branches
last term ;-)

Thomas