Hull, P. M., Bornemann, A., Penman, D. E., Henehan, M. J., Norris, R. D., Wilson, P. A., et al. (2020). On impact and volcanism across the Cretaceous-Paleogene boundary. Science, 367: 6475, pp. 266-272. doi:10.1126/science.aay5055.