《科学》[Science]13年5月24日出版pdf全文

nero1981

* o# q, }- B0 w4 BCOVER A Classopollis meyeriana conifer pollen grain (~30
8 b) A. i3 R$ ^- y7 k' S7 I) N( d' q. P8 ~micrometers across) preserved in lake sediments deposited just after a massive, 2 y. D$ V, g0 j- ]$ Z  }
volcano-induced extinction event ~200 million years ago. This fossilized pollen , W; h7 j% H. n! z4 B
grain is representative of the low-diversity plant assemblages found within the
; u0 O0 t- @' Z5 jtropics of the Pangean supercontinent during the postextinction recovery period.
9 l  o" E- w6 e# d7 h. d7 CSee page 941. Image: * ~2 X, h: Y3 V( \( [4 w# Y9 {
Dee Breger and Sarah Fowell/Science Source
8 y  B7 {( u6 f" l2 k

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