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

众所周知，生活在世界各地的中生代恐龙在白垩纪末期突然灭绝，而哺乳动物在新生代分布很大。恐龙灭绝原因的研究，不仅是古生物学领域的重大课题，也是整个地球科学领域的重大课题。本文通过对内蒙古、中国和蒙古国发现的恐龙蛋壳化石的光学显微镜和扫描电子显微镜观察，试图获得有关中生代末期恐龙大灭绝的新资料。(1)所研究的恐龙化石蛋壳的内部结构是以“哺乳动物”为基本单位，以及迄今所研究的现代鸟类蛋壳和恐龙蛋壳。(2)蛋壳的微观结构与蛋形差异(蛋的种类)的差异相对应。(3)壳层主要由方解石组成，仍保留着良好的原始结构。这意味着这些物质没有受到成岩蚀变那么强烈的影响。必须进一步研究化学成分。

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.