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In page Cretaceous–Paleogene boundary:

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A very large structure in the sea floor off the west coast of India was interpreted in 2006 as a crater by three researchers.[4] The potential Shiva crater, 450–600 km (280–370 mi) in diameter, would substantially exceed Chicxulub in size and has been estimated to be about 66 mya, an age consistent with the K–Pg boundary. An impact at this site could have been the triggering event for the nearby Deccan Traps.[5] However, this feature has not yet been accepted by the geologic community as an impact crater and may just be a sinkhole depression caused by salt withdrawal.[3]