R. Renne at the University of California at Berkeley suggests that the Chicxulub crater is in fact within the time frame of when the mass extinction occurred. Criticism The claims of an impact crater have been criticised. Christian Koeberl, a Professor of Geology at the University of Vienna and a specialist on impact craters, described the claims in 2004 as "a figment of imagination", stating that the claims were "inconsistent not only with the regional geology and geophysics, but also with anything we know about impact cratering." American geologist Gerta Keller stated in 2007, "We have worked extensively throughout India and investigated a number of the localities where Sankar Chatterjee claims to have evidence of a large impact he calls Shiva crater... Unfortunately, we have found no evidence to support his claims. Sorry to say, this is all nonsense." Geophysicist Steve Gulick stated in the same year, "There's a bunch of problems to say the least. There is no evidence that [Chatterjee is] presenting of it actually being a crater", and described the oval shape of the structure as unlikely for an impact crater. In the chapter "Impact Cratering from an Indian Perspective", from the 2013 book Earth System Processes and Disaster Management, geologists Jayanta K. Pati and Puniti Pati write that "...the proposed Shiva structure in the Arabian Sea to the southwest of the Indian subcontinent (Chatterjee et al. 2006) have also been suggested to be of possible impact origin. However, Chatterjee et al. (2006) do not provide any substantial evidence for the existence of a crater structure and certainly not for the existence of an impact structure at Shiva." See also Impact craters in India Lonar crater at Lonar in Buldhana district of Maharashtra Luna crater at Kutch district of Gujarat Ramgarh Crater in Mangrol tehsil of Baran district of Rajasthan Other related topics List of impact craters on Earth List of possible impact structures on Earth Indian Ocean submerged features Central Indian Ridge Southeast Indian Ridge Southwest Indian Ridge Rodrigues Triple Junction Notes References External links The Shiva Crater: Implications for Deccan Volcanism, India-seychelles Rifting, Dinosaur Extinction, and Petroleum Entrapment at the Kt Boundary by Chatterjee, Sankar; Guven, Necip; Yoshinobu, Aaaron; and Donofrio, Richard; Paper No. 60-8, 2003 Seattle Annual Meeting of Geological Society of America (November 2–5, 2003). Deep Impact - Shiva: Another K-T Impact? by Leslie Mullen for Astrobiology Magazine (Nov. 2004). The Complete Catalog