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7 J$ Y3 X$ L! mCOVER A Classopollis meyeriana conifer pollen grain (~30
/ K4 j: U" Y& Q8 Nmicrometers across) preserved in lake sediments deposited just after a massive, / V; l `9 G# C
volcano-induced extinction event ~200 million years ago. This fossilized pollen 2 M. C. ^: o P, k! L
grain is representative of the low-diversity plant assemblages found within the
/ e8 f' s9 [3 ?( r2 O( ktropics of the Pangean supercontinent during the postextinction recovery period.
* z) P4 Q- B: D6 rSee page 941. Image: ! \/ J: ^! _8 O- W
Dee Breger and Sarah Fowell/Science Source 8 K9 s2 @5 F7 p, J$ Y' V( B
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发表于 2013-5-24 12:33
发表于 2013-5-24 14:05
