'Dinosaur-killing' impact did not start global wildfires

Burnt oil and gas, not vegetation, may have caused the soot layer at the end of the Cretaceous period.

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Belcher, C. M., Finch, P., Collinson, M. E., Scott, A. C. & Grassineau, N. V. Proc. Natl Acad. Sci. USA [doi:10.1073/pnas.0813117106] (2009).
Belcher, C. M., Collinson, M. E., Sweet, A. R., Hildebrand, A. R. & Scott, A. C. Geology 31, 1061–1064 (2003).
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Philip Ball
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Ball, P. 'Dinosaur-killing' impact did not start global wildfires. Nature (2009). https://doi.org/10.1038/news.2009.112