《科学》[Science]13年5月24日出版pdf全文

nero1981

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COVER A Classopollis meyeriana conifer pollen grain (~30 ( M6 N) D+ ]3 f% m% W
micrometers across) preserved in lake sediments deposited just after a massive, 9 j; h9 f8 L+ r9 z
volcano-induced extinction event ~200 million years ago. This fossilized pollen
  Q/ Q6 f0 U6 zgrain is representative of the low-diversity plant assemblages found within the ' g2 S$ a, c5 V' T  `) E
tropics of the Pangean supercontinent during the postextinction recovery period. + K$ P! D1 ?2 w8 k
See page 941. Image:
4 h# u1 x+ d2 }, U  n- j9 PDee Breger and Sarah Fowell/Science Source
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