https://www.efecon.tuiasi.ro/en/research-article-en-2/soot-in-cretaceous-paleogene-boundary-clays-worldwide-is-it-really-derived-from-fossil-fuel-beds-close-to-chicxulub/ EFECON Thu, 25 May 2023 17:48:06 +0000 hourly 1 https://wordpress.org/?v=6.1.1