《科学》[Science]13年5月24日出版pdf全文

nero1981

5 [$ m, Z  @& g* N3 r' G" S6 k7 k. {
COVER A Classopollis meyeriana conifer pollen grain (~30 & k& o+ n. [$ q8 S5 n& O7 s
micrometers across) preserved in lake sediments deposited just after a massive,
; u3 b' O4 V* |' X( ]" B1 R4 Cvolcano-induced extinction event ~200 million years ago. This fossilized pollen
& H) f1 ?" ?, u1 J% i& P4 p. Egrain is representative of the low-diversity plant assemblages found within the % C% C  g7 d. m; d
tropics of the Pangean supercontinent during the postextinction recovery period.
6 v( M0 y, l  r  CSee page 941. Image: , D6 q( [1 g) z2 A# X, ]+ t
Dee Breger and Sarah Fowell/Science Source . F/ A) u, H) o

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