Similar soot can still be found in ancient rocks from volcanic fires of 66 million years ago, a record of the cataclysm touched off by an asteroid at the end of the late Cretaceous epoch.

类似的烟灰仍然可以在 6600 万年前火山大火的古老岩石中找到，这是白垩纪末期一颗小行星引发的灾难的记录。