The collision left behind tell tale traces in the rocks - including a black 'mat' of soot an inch thick thought to have been created by continental wide wildfires.
这次撞击将能够告诉我们答案的痕迹留在了岩石里——包括岩石中一个1英寸（约2.54厘米）厚的黑色煤灰层，之前这个煤灰层一直被认为是由地球大陆上广泛扩散的野火造成的。
The collision left behind tell tale traces in the rocks - including a black 'mat' of soot an inch thick thought to have been created by continental wide wildfires.
这次撞击将能够告诉我们答案的痕迹留在了岩石里——包括岩石中一个1英寸（约2.54厘米）厚的黑色煤灰层，之前这个煤灰层一直被认为是由地球大陆上广泛扩散的野火造成的。
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