Chicxulub Tsunami

20 Jul 2021

At https://phys.org/news/2021-07-megaripples-evidence-giant-tsunami-resulti... ... it seems a megatsunami wave did occur as a result of the Chicxulub asteroid strike at the K/Pg boundary [formerly K/T]. Two geophysicists, and other co-workers, from the University of Louisiana at Lafayette have found what they think is strong evidence for a tsunami, gouging out the sea floor in a massive ripple formation. The wave would have made its way across the Gulf of Mexico to the southern States - a wave that is estimated as being a mile high, as it struck land. Modern tsunamis leave a characteristic signature on the sea bed. A distinct geological formation - ripples. Seismic data allowed them to look at soils to depths of 1500m below the surface. Megaripples were found. Huge fossilised ripples were created by a massive influx of water in Louisiana. The ripples pointed directly at the Yucatan - and Chicxulub. What about the other direction? The so called North American Inland Seaway. Is that on the same trajectory?

The full paper is at https://doi.org/10.1016/j.epsl.2021.117063

At https://phys.org/news/2020-09-evidence-ejected-chicxulub-crater-impact.html ... last year PNAS published a research paper that claimed material ejected from Chicxulub caused an impact winter - plunging temperatures as a result of an obscured sun. Prolonged darkness. See also https://doi.org/10.1073/pnas.2004596117