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"It's the first time we can directly link the main phase of the Deccan Traps to the mass extinction," said Princeton University paleontologist Gerta Keller. The main phase of the Deccan eruptions spewed 80 percent of the lava and covered hundreds of miles. It is calculated to have released ten times more climate altering gases into the atmosphere than the nearly concurrent Chicxulub meteor impact, according to volcanologist Vincent Courtillot from the Physique du Globe de Paris.
Previous work had first narrowed the Deccan eruption timing to within 800,000 years of the extinction event using paleomagnetic signatures of Earth's changing magnetic field frozen in minerals that crystallized from the cooling lava. Then radiometric dating of argon and potassium isotopes in minerals narrowed the age to within 300,000 years of the 65-million-year-old Cretaceous-Tertiary (a.k.a. Cretaceous-Paleogene) boundary, sometimes called the K-T boundary.
The distribution of hotspots on the Earth has a distinct antipodal character, which has previously been shown to be statistically significant (p100 Myr) and could have drifted quite far from antipodality with their opposite hotspots. The remaining 9 primary hotspots have antipodes in the Pacific Ocean where submerged hotspots or impact structures could yet be identified. All hotspots antipodal to those associated with flood basalt provinces or formed in continental crust are, or were, in oceanic crust suggesting links between major deep-ocean impacts, greater impact/seismic efficiency, and the creation of antipodal hotspot pairs. In general, `spotless' areas  occur opposite to continental masses, and no hotspot volcanism is found at or antipodal to known continental impact structures.  Rampino and Caldeira, GRL (1992) 2011;  Schultz and Gault, The Moon (1975) 159;  Boslough et al., GSA Spec. Pap. 307 (1996) 541;  Roddy et al., Int. J. Impact Eng. (1987) 525;  Vogt, JGR (1981) 9