I think a competing theory was/is that the mass extinction was caused by volcanism of the Deccan-Traps, briefly mentioned in the abstract “…occurred within the

I think a competing theory was/is that the mass extinction was caused by volcanism of the Deccan-Traps, briefly mentioned in the abstract “…occurred within the time of Deccan flood basalt volcanism in India”. This article seems to confirm a direct relation between the meteorite impact and the extinction with the deccan traps activity possibly serving as a contributing factor.