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 " E& B7 ~5 H" u/ W$ s
COVER A Classopollis meyeriana conifer pollen grain (~30
" M% a2 A1 `+ i. T- x6 f+ R8 mmicrometers across) preserved in lake sediments deposited just after a massive, " q8 h6 i s1 d" K6 @8 @- c( ?
volcano-induced extinction event ~200 million years ago. This fossilized pollen . S6 t& t/ t1 v: o/ y
grain is representative of the low-diversity plant assemblages found within the 1 z) `% N5 E6 z) K3 x9 ^
tropics of the Pangean supercontinent during the postextinction recovery period.
# d/ ^3 }: e! s$ bSee page 941. Image: ! [3 |6 J' a$ P% n
Dee Breger and Sarah Fowell/Science Source 0 z5 }" g! }# V/ }
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发表于 2013-5-24 12:33
