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李四光教授是我国卓越的科学家、教育家,他曾两度在北京大学任教,1920-1928年任教授,1931-1936年任研究教授并任地质学系主任。北大地质学系20多届毕业生都直接受业于他。他讲授过矿物学、岩石学、构造地质学、高等岩石学、地壳运动等课程,教学极端负责任,对学生既热情爱护,又严格要求。李四光教授在地质科学的许多领域都作出了重大贡献,如;以(?)科化石的创造性研究,奠定了海相石炭二叠纪地层划分对比的基础;中国第四纪冰川的研究;从力学观点研究地质构造等,都是在北大期间作出的巨大成果。李四光教授对北大地质学系的建设和发展也作出了重要贡献,直到1970年,还对系的教学和科研工作提出指导意见。
Professor Li Siguang is a remarkable scientist and educator in our country. He has twice taught at Peking University, served as professor in 1920-1928, and served as research professor in 1931-1936 and as director of geology department. Peking University Department of Geology more than 20 graduates are directly affected by him. He taught such courses as mineralogy, petrology, structural geology, advanced petrology and crustal movement. Teaching is extremely responsible and enthusiastic for students, while demanding strict requirements. Professor Li Siguang has made significant contributions in many fields of geosciences, such as the creative study of (?) Fossils, laying the foundation for the marine Permian-Permian stratigraphic division, the study of Quaternary glaciers in China, Viewpoint of geological structure, etc., are great achievements made during the Peking University. Professor Li Siguang also made important contributions to the construction and development of the Department of Geology at Peking University. Until 1970, he also gave guidance on the teaching and research work of the department.