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本帖最后由 细胞海洋 于 2013-4-15 08:15 编辑 ! ]: i" j1 u3 @; f) I) w
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About the cover
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( h/ _' n' C7 Z4 {# hFossil dinosaur
) D! K6 b2 L$ R Y* V v* ?embryos are extremely rare, and mainly restricted to the Late Cretaceous period.
p2 x+ h. A* ~, u) j }! J; GHence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph 8 m" k2 [) ? M! O. ]
embryos from China, which at about 190–197 million years old is the oldest ) U6 L4 V2 h8 ~0 M
assemblage of such bones ever found. A three-year multinational programme of
, P, t/ z+ p& lexcavation and research has yielded a treasure trove of embryonic bones, and the
* A- i s% L4 o/ s- doldest known evidence of organic remains. Study of bones preserved at various 0 `' q! ~ }5 V% V. y! Y- x9 A1 p3 R2 r
developmental stages indicates that these large dinosaurs had a short incubation 9 t: W! Q2 m# T6 d/ v
time and flexed their muscles while still in the egg, preparing the growing 4 ~2 X" s. q7 D; ^, g3 p; a9 O. Y
skeleton for life in the outside world. On the cover, a coloured thin section of ' d# d$ ?. K6 C% Z% D6 i a
an embryonic femur showing its internal tissues and large marrow cavity. ; C. Y% p: b* I' h+ u9 G( H/ Y* S
7 x% u6 T: n. k9 E3 p% k5 u[hide][/hide]
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发表于 2013-4-11 18:36
发表于 2013-4-11 20:09
