The surprise crater was discovered on Earth's unexplored ocean floor.
, raises the question of whether the crater might be related to Chicxulub in some way. If confirmed, it would also be of huge general scientific interest as it would be one of a very small number of known marine asteroid impacts and so give unique new insights into what happens during such a collision." as part of a wider project to reconstruct the tectonic separation of South America from Africa back in the Cretaceous period.
Scrolling through this data at the end of 2020, we came across a highly unusual feature. Among the flat, layered sediments of the , west of Africa, was what appeared to be a large crater, a little under 6.2 miles wide and several hundred meters deep, buried below several hundred meters of sediment. Many of its features are consistent with an impact origin, including the scale of the crater, the ratio of height to width and the height of the crater rim. The presence of chaotic deposits outside of the crater floor also look like"ejecta" — material expelled from the crater immediately following a collision.We did consider other possible processes that could have formed such a crater, such as the collapse of a submarine volcano or a pillar of salt below the seabed.
Shock waves from the impact would be equivalent to a magnitude 6.5 or 7 earthquake, which would likely trigger underwater landslides around the region. A train of tsunami waves would form.
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