《科学》[Science]13年5月24日出版pdf全文

nero1981

# L5 m+ G0 Q  y: }8 ?4 j+ OCOVER A Classopollis meyeriana conifer pollen grain (~30 , v% w! a8 W% [6 f8 Q
micrometers across) preserved in lake sediments deposited just after a massive,
! F$ m# Y9 h( w/ [- u$ ?volcano-induced extinction event ~200 million years ago. This fossilized pollen 0 z  k1 f3 m  Y3 y" o
grain is representative of the low-diversity plant assemblages found within the
5 i9 g. B- k) N) N% Jtropics of the Pangean supercontinent during the postextinction recovery period. 4 D) b# ^" _. z" ?9 |
See page 941. Image: . a% s0 z1 `7 }( N" P8 B. _
Dee Breger and Sarah Fowell/Science Source
3 p+ G* [4 A% C% B3 v

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