Figure 2
From: Mysterious abrupt carbon-14 increase in coral contributed by a comet

A cartoon illustrating our proposed mechanism causing a 14C spike--the collision of the Dai7 “Comet” with high 14C and 10Be contents with the Earth's atmosphere.
As it descends, 14C and10Be is released until the comet burns out. This spike of cosmogenic 14C is first added to the atmosphere with its originally very low 14C and the additional carbon is then incorporated into coral from the South China Sea and Japanese trees. The original record of the Dai7 “Comet” event (in Chinese with translation) is also shown in the lower left corner of the cartoon. Photos are provided by Yi Liu.