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本帖最后由 细胞海洋 于 2013-4-15 08:15 编辑 0 R! ?/ E6 Y' ?. h
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6 K1 w' N3 B4 W+ Y, A8 V' MAbout the cover1 }# Z9 a! j3 ~, ]1 d7 }. Y+ D
: N# o- T* e9 Z" ]9 M2 S9 sFossil dinosaur 7 D! C! w; G7 {1 P A2 B- [
embryos are extremely rare, and mainly restricted to the Late Cretaceous period.
% h1 w g# R7 F$ n5 d r4 ~/ JHence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph
9 m) q- ]- U+ @# V7 eembryos from China, which at about 190–197 million years old is the oldest
# D9 y" X( x5 j ?assemblage of such bones ever found. A three-year multinational programme of
1 `1 j$ E& j+ K! F5 Cexcavation and research has yielded a treasure trove of embryonic bones, and the
3 q5 _- R* p8 G! g' k. Toldest known evidence of organic remains. Study of bones preserved at various
2 l! ^, T8 ]& T0 V1 ]* W6 wdevelopmental stages indicates that these large dinosaurs had a short incubation
, ~4 n) E0 x+ H7 xtime and flexed their muscles while still in the egg, preparing the growing 4 p7 H8 z: [' D
skeleton for life in the outside world. On the cover, a coloured thin section of 5 r/ L( I" ]0 G) c
an embryonic femur showing its internal tissues and large marrow cavity.
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发表于 2013-4-11 18:36
发表于 2013-4-11 20:09
