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 * K3 B) i# ^. d8 B& V
COVER A Classopollis meyeriana conifer pollen grain (~30
' p$ y1 [2 l. i6 ^: gmicrometers across) preserved in lake sediments deposited just after a massive, - H# r6 S7 D! X
volcano-induced extinction event ~200 million years ago. This fossilized pollen " a9 F/ G( ^, \7 a
grain is representative of the low-diversity plant assemblages found within the
; ^* `# G/ c! f7 I$ l; htropics of the Pangean supercontinent during the postextinction recovery period. * H C5 U/ a8 c. i& N
See page 941. Image: % k8 s/ i. h; E! W# }7 U
Dee Breger and Sarah Fowell/Science Source
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发表于 2013-5-24 12:33
