No, the coal beds are far older and far thicker than the bit of end-cretaceaous soot that paper is talking about. The K-Pg boundary sediments are thin: http://e

No, the coal beds are far older and far thicker than the bit of end-cretaceaous soot that paper is talking about. The K-Pg boundary sediments are thin: http://en.wikipedia.org/wiki/File:Cretaceous_Paleogene_clay_at_Geulhemmergroeve.jpg http://en.wikipedia.org/wiki/File:Cretaceous_Paleogene_clay_... Your typical coal bed is quite a bit thicker: http://en.wikipedia.org/wiki/File:Coal_mine_Wyoming.jpg http://en.wikipedia.org/wiki/File:Coal_mine_Wyoming.jpg