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; s6 b8 ` }) X- {0 `9 Z+ vCOVER A Classopollis meyeriana conifer pollen grain (~30 * L" j4 d1 {2 t/ c; V+ P0 w3 w' ^3 L
micrometers across) preserved in lake sediments deposited just after a massive, 1 ~. O! R! k* R& L, c7 o
volcano-induced extinction event ~200 million years ago. This fossilized pollen / f" x. [+ F; g
grain is representative of the low-diversity plant assemblages found within the
& i1 I2 A" F5 \" Ftropics of the Pangean supercontinent during the postextinction recovery period.
' }0 n6 R9 ^5 hSee page 941. Image: 3 p1 I# p+ d( e$ r& v
Dee Breger and Sarah Fowell/Science Source , J$ l& D, f( P }, \# h
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发表于 2013-5-24 12:33
