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 8 d0 _$ Z" V# ]% G( ?7 z# A
COVER A Classopollis meyeriana conifer pollen grain (~30
) U6 H, D& p3 I3 _4 C$ G2 J6 Fmicrometers across) preserved in lake sediments deposited just after a massive,
7 n. t' d0 V$ I! `- [volcano-induced extinction event ~200 million years ago. This fossilized pollen
! n! X' ^: u* r; a: v0 s1 B7 }grain is representative of the low-diversity plant assemblages found within the
. B% ^5 k3 L% C2 ]% Dtropics of the Pangean supercontinent during the postextinction recovery period. & n; U6 V( E. ~$ X! O; Q0 v e9 {8 P
See page 941. Image:
3 f" a1 p9 ?$ xDee Breger and Sarah Fowell/Science Source 6 m) C9 P+ I. L% R1 q& E
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发表于 2013-5-24 12:33
