Preliminary results show poor planktic foraminifer test preservation in the top ~1 m (zone CF1) at Agost, correlative with high-stress conditions preceding the mass extinction horizon at Bidart, Gamsbach and Elles (Tunisia). Correlative zone CF1 sediments in the eastern Tethys (Egypt, Israel) show inverse correlation between carbonate preservation and blooms of the disaster opportunist Guembelitria that links ocean acidification with high-stress conditions in planktic foraminifera. Close to the volcanic source in India significantly stronger carbonate dissolution effects are recorded in Meghalaya [3] to the northeast and in intertrappean sediments between the longest lava flows of the Deccan volcanic province that ended with the mass extinction [4]. Global documentation of Deccan volcanism-related proxies and environmental effects preceding the KTB mass extinction is now possible and brings much needed clarity and improved understanding of the catastrophic effects of Large Igneous Province (LIP) volcanic eruptions during four of the five big mass extinctions in Earth’s history.