ABNORMAL MICROSTRUCTURE AND CHEMICAL COMPONENTS IN THE FOSSIL DINOSAURIAN EGG SHELLS FROM THE K-T BOUNDARY

众所周知，生活在中生代世界各地的恐龙在白垩纪末期突然灭绝，而哺乳动物则在新生代大规模分布。对恐龙灭绝原因的研究是古生物学乃至整个地球科学领域的一个重大问题。本研究试图利用光镜和扫描电镜对内蒙古、中国和蒙古地区发现的恐龙蛋壳化石进行观察，获得关于中生代末期大灭绝的新资料。下面是本研究的简要总结；(1)所研究的恐龙蛋壳化石的内部结构由称为“哺乳类”的基本单位以及迄今为止研究的鸟类蛋壳和恐龙蛋壳组成。(2)蛋壳的微观结构与蛋的形状差异（蛋的种类）相对应。(3)壳层以方解石为主，仍保留了较好的原始结构。这意味着这些物质没有受到成岩蚀变的强烈影响。化学成分必须进一步研究。

It is well known that dinosaurs lived around the world in Mesozoic Era extinct suddenly at the end of Cretaceous Period, and instead of them Mammals made big distribution in Cenozoic. Study on the reason of extinction of dinosaurs is very big and important problems not only in paleontology but also in the whole field of the earth science. In this study, we tried to get a new data concerning the great extinction in the end of the Mesozoic by the observation of the fossil egg shells of dinosaurs found in inner Mongolia, China and Mongolia under the light microscope and scanning electron microscope.The brief summary of this research is described in the fllowings;(1)Internal texture of the fossil dinosaurian egg shells investigated consists of the basic unit called "Mammila" as well as the recent avian egg shells and dinosaurian egg shells studied until now.(2)The microstructure of the egg shells correspond to the differences of the egg shape difference (kind of the eggs).(3)The shell layer is composed of calcite mainly and fine original textures are still preserved. It means that these materials have not been influenced so strongly by the diagenetic alteration. Chemical components must be investigated further more.