一种稀有化石标本的发现总会引起古生物学家们兴奋。自从十九世纪人们在西德的索伦霍芬侏罗纪石灰岩地层中发现了始祖鸟化石以来,一直有人对它的演化地位和真实性提出怀疑。这种鸟类的化石表明始祖鸟显 The discovery of a rare fossil specimen always causes paleontologists to be excited. Ever since the discovery of Archeopteryx fossils in the Jurassic limestone formations of the Sorensen during the nineteenth century, there have been doubts about its status and authenticity. Fossils of this bird indicate Archeopteryx conspicuously