Location matters. Especially to extinction-causing asteroids.
“The ratio of soot components at the Cretaceous/Paleogene boundary marked by a mass extinction caused by an asteroid impact indicates a higher energy than forest fires, and the equivalence of molecular ratios at proximal and distal sites indicate a single source of the soot, which suggest that it was sourced from the target rocks of the Chicxulub asteroid impact,” Kaiho says in an e-mail.
“I agree with the concept that location matters when you think of an asteroid strike,” Gulick says. “It’s hard to create a global level extinction event without it being related to the climate.” What the team led by Gulick and Joanna Morgan, a geoscientist at Imperial College London, has found are rocks that were formed in ocean environments—carbon-rich limestones, gypsum, and other layers of rock created by evaporating ocean water. Gulick and others believe that the asteroid impact, when it hit these stones, sent carbon dioxide and sulfur high into the atmosphere.
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