《科学》[Science]13年5月24日出版pdf全文

nero1981

* ~  e; g) r- h4 g2 I( j' fCOVER A Classopollis meyeriana conifer pollen grain (~30 , U# W" A: G0 M! Z
micrometers across) preserved in lake sediments deposited just after a massive, 6 n; ?. q2 _6 T0 D. K( i* F, R
volcano-induced extinction event ~200 million years ago. This fossilized pollen
0 `! [: X; R1 x8 e6 v* @+ ^* |grain is representative of the low-diversity plant assemblages found within the - J# L& n0 R! ?
tropics of the Pangean supercontinent during the postextinction recovery period.
3 L- E& Q0 G- x+ u9 |" F5 aSee page 941. Image:
, G0 `6 |7 F% H7 d, c. l6 I: ADee Breger and Sarah Fowell/Science Source
% d" \2 \4 T1 s0 m+ ]( `5 z

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