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COVER A Classopollis meyeriana conifer pollen grain (~30
! T }4 a0 p# k, w" pmicrometers across) preserved in lake sediments deposited just after a massive,
& x( @4 H$ ]7 e; K# Cvolcano-induced extinction event ~200 million years ago. This fossilized pollen 5 V" q, q: N/ j+ N2 e$ M
grain is representative of the low-diversity plant assemblages found within the
# l* z7 c. @; }% J% v5 Qtropics of the Pangean supercontinent during the postextinction recovery period.
" ?1 L% M! x) n4 G$ k6 k( @, PSee page 941. Image:
+ G% A" N4 N; WDee Breger and Sarah Fowell/Science Source 6 E% S! }- y2 P* J D$ u E; a: ]
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发表于 2013-5-24 12:33
