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K/Pg Wild Fires

10 September 2022

This story is said to shine a torch on the 66 million year old wild fire mystery surrounding the K/Pg impactor, asteroid, or comet. Curiously, it is described as a meteorite – but do they come that big, several miles wide? See https://phys.org/news/2022-09-scientists-million-year-old-meteorite-wildfire-mystery.html … which provides a link to the full article at https://www.nature.com/articles/s41598-022-17292-y … the 6 miles wide meteorite, it claims, triggered a mass extinction event that killed up to three quarters of living species, including the dinosaurs. Uncertainty has surrounded the circumstances behind the devastating wild fires that broke out, with different theories as to how and when they started, and their full extent. Analysis rocks and fossilised trees from the Late Cretaceous have shown that fires were sparked almost instantaneously. Sometimes these fires were extinguished by the closely following mega tsunami that was created. Fires broke out in minutes, at most, as a result of blast and the heat generated in the collision, and has been recognised in areas from as far away as 2500km from the impact site at Chicxulub on the Yucatan peninsular. A team  of scientists from three UK universities, as well as Mexican and Brazilian scientists, repeat the finding of a megatsunami [a huge tidal wave that would have battered the nearby land surfaces]. A fireball of epic proportions may have created the wild fires, it is suggested, but heat from droplets of melted rock falling back through trhe atmosphere in the immediate aftermath of the impact might also be regarded as a possibility. Trees were already charred prior to being swept up in the tsunami wave. A lot of  pebbly mudstones were found and researched, presumably the evidence for a tsunami wave. You can read the full article at the link above.

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