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COVER A Classopollis meyeriana conifer pollen grain (~30
8 b7 y5 z7 b1 j% v8 xmicrometers across) preserved in lake sediments deposited just after a massive,
1 W9 k3 V; N1 z% }% d* \volcano-induced extinction event ~200 million years ago. This fossilized pollen
* E) K( S9 Q: xgrain is representative of the low-diversity plant assemblages found within the
; v* R5 W# u0 ~; Itropics of the Pangean supercontinent during the postextinction recovery period.
+ p3 `6 T5 A8 |See page 941. Image: 8 r) a' s3 w _8 f, r- x7 g
Dee Breger and Sarah Fowell/Science Source
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发表于 2013-5-24 12:33
