《科学》[Science]13年5月24日出版pdf全文

nero1981

* m+ p. i* F- ]+ b8 I, X+ U8 b; I
COVER A Classopollis meyeriana conifer pollen grain (~30
( _/ a- T7 f' p( ^micrometers across) preserved in lake sediments deposited just after a massive,
$ |# v; s7 ~* H6 u7 @8 |" C3 ]# Mvolcano-induced extinction event ~200 million years ago. This fossilized pollen * |9 j) n$ i3 z
grain is representative of the low-diversity plant assemblages found within the
1 O. L" s+ S. d, stropics of the Pangean supercontinent during the postextinction recovery period. ; C5 r( \* z. w$ ]! _% P$ O; |
See page 941. Image: 4 \3 h6 b) K& }5 X& c3 ?
Dee Breger and Sarah Fowell/Science Source 5 a1 H* @6 m0 b9 z- A' \2 P

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