《科学》[Science]13年5月24日出版pdf全文

nero1981

; j, v) S4 o$ e/ kCOVER A Classopollis meyeriana conifer pollen grain (~30 7 ^0 ^. T, r: ~: y4 }! W% w
micrometers across) preserved in lake sediments deposited just after a massive,
! d7 e5 E2 I" I+ w1 d  V+ evolcano-induced extinction event ~200 million years ago. This fossilized pollen
( \) u" \3 M- L( W. Y' b. Zgrain is representative of the low-diversity plant assemblages found within the
/ A- b3 w* t1 P1 Xtropics of the Pangean supercontinent during the postextinction recovery period. # b/ d& e% [- e* V, m; m, @' W$ u
See page 941. Image: + |0 Z7 z( c& y$ {4 _. l& e' O
Dee Breger and Sarah Fowell/Science Source
- r, N, O2 v' {

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