The Chicxulub Debate



The Princeton model shows (at left) that the structure of the Earth's surface at the time of the meteorite impact that caused the Chicxulub crater in Mexico would have placed the Deccan Traps in India far west of the crater's antipodal point, instead of directly opposite of the impact. Correspondingly, the model shows (at right) that the meteorite struck far east of the antipodal point for the Deccan Traps, which are remnants of large volcanoes thought to have contributed to the mass extinction event at the end of the Cretaceous period. The model also revealed that the Chicxulub impact, when the Earth's surface and shape are considered, would have likely been too small to cause the Deccan Traps. Source: Princeton University

1. Chicxulub predates the KT boundary and is not the cause for the end-Cretaceous mass extinction 2. Chicxulub Crater

CHICXULUB - THE NON-SMOKING GUN

• Chicxulub Impact Predates KT Mass Extinction in NE Mexico
• Chicxulub Crater
• Conclusions - Chicxulub Impact Predates KT by 300 kyr
• Chicxulub Evidence at Brazos, Texas
• The KT Transition in Brazil
• Chicxulub Impact - No Mass Extinction
• The Great Chicxulub Debate - 2003-2004
• Reference

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The following papers can be downloaded as pdf files:

• Chicxulub impact predates K-T Boundary: new Evidence from Brazos, Texas (Gerta Keller et al., Earth and Planetary Science Letters, 255 (2007), 339-356)
• Biotic effects of impacts and volcanism (by Gerta Keller, Earth and Planetary Science Letters 215 (2003) 249-264)
  
• The end-cretaceous mass extinction in the marine realm: year 2000 assessment (by Gerta Keller, Planetary and Space Science 49 (2001) 817-830)
• Multiple impacts across the Cretaceous-Tertiary boundary (by G. Keller et al., Earth-Science Reviews 62 (2003) 327-363)
• Spherule deposits in Cretaceous-Tertiary boundary sediments in Belize and Guatemala (by G. Keller et al., Journal of the Geological Society, London, Vol. 160, 2003, pp. 783-795)
• The Non-Smoking Gun (Geological Society London)
• The Non-Smoking Gun - DEBATE (Geological Society London)
• Chicxulub impact predates the K-T boundary mass extinction (by G. Keller et al., PNAS, Vol. 101 No. 11, 2004, pp. 3753-3758.
• More evidence that the Chicxulub impact predates the K/T mass extinction (by G. Keller et al., Meteoritics & Planetary Science 39 (2004) 1127-1144)

RFERENCES: The Chicxulub Debate - Princeton University