Mixed in with the charcoal, as Dr Kennett and a number of his colleagues reported to a meeting of the American Geophysical Union in Acapulco this week, are other bits that point to such an impact.

• Kennett博士和他的同事在本周于阿卡普尔科举行的美国地球物理联盟会议上所作的报告中指出，木碳中的一些混合物也可证明撞击的存在。