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一、中国奥陶系的研究简史中国奥陶系的研究已有相当的历史。早在1856—1929年间,即有零星的化石记录,1920 年后,中国地质学者对奥陶纪地层的研究有了很大的发展。1924年,李四光、赵亚曾调查了长江三峡地质后,即创立艾家山系的名称,并指出其属于中奥陶统或包括上奥陶统最低部。当时艾家山系包括下部杨子贝层,上部宝塔石灰岩。将艾家山系以下的地层,称宜昌石灰岩,定为下奥陶统。张鸣韶在1934年曾谈及湖北南漳覆于宜昌石灰岩上的艾家山层,分为上、下两部,认为其下部与扬子贝层相当,似无问题;上部石灰岩含有头足类,可与瑞典之直角石灰岩、苏联之 Vaginoceras 石灰岩相对比。
A Brief History of Ordovician Research in China The research of Ordovician in China has a long history. As early as 1856-1929, there were sporadic fossil records. After 1920, Chinese geologists made great progress in the study of Ordovician strata. In 1924, after Li Siguang and Zhao Ya investigated the geology of the Three Gorges of the Yangtze River, they established the name of the Aijia Mountains and pointed out that they belong to the Middle Ordovician or include the lowest part of the Upper Ordovician. At that time, the Department of Elks, including the lower part of the Yangzi layer, upper pagoda limestone. The following Yi Jia Shan strata, said Yichang limestone, as the Lower Ordovician. In 1934, Zhang Ming Shao talked about the Aiqishan layer overlying the Yichang limestone in Nanzhang, Hubei Province. It was divided into upper and lower parts, and the lower part of the upper part is thought to be similar to the Yangtze shellfish. There seems to be no problem in the upper part of limestone; Right-angled limestone in Sweden, compared to the Vaginoceras limestone in the Soviet Union.