Meteorites are extraterrestrial materials formed in the early solar nebula about 4.6 billion years ago. Carbonaceous chondrites which belong one oh meteorite groups contain various kinds of extraterrestrial organic compounds formed by abiotic process. Therefore, characteristic features of organic compounds in carbonaceous chondrite provide useful information to the primordial organic chemistry in the early solar system and chemical evolution on the primitive earth. On the other hand, sedimentary rocks were formed on the earth and contain terrestrial organic compounds derived from organisms lived on the past earth. Therefore, analyses of organic compounds in sedimentary rocks provide good information to biological activity on the past earth and their alternation process occurred during their burial periods. ･･･Thesis (Ph. D. in Science)--University of Tsukuba, (A), no. 2575, 2001.3.23Includes bibliograpical referencesTitlepage,Contents -- List of Tables,List of Figures -- Chapter 1 General Introduction -- Chapter 2 Thiophenes in Neogene Sediments of the Shinjo Basin,Japan -- Chapter 3 Thiophenes in the Cretaceous/Tertiary Boundary Sediments at Kawaruppu,Hokkaido,Japan -- Chapter 4 Polynuclear Aromatic Thiophenes in the Murchison Carbonaceous Chondrite -- Chapter 5 Summary and Conclusions -- Acknowledgment
