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贾汪煤田周围奥陶系广泛出露,1924—1939年间,刘季辰、李四光、谢家荣在调查煤田地质的同时,对附近的奥陶系做了不同程度的研究工作,当时笼统称为“奥陶纪珠角石灰岩”,“奥陶纪马家沟石灰岩”,对于奥陶系下部与寒武系连接部位的一段地层,李四光(1930)命名为“贾汪页岩”,其下谢家荣(1932)命名为“三山子石灰岩”,这两段地层的时代,有的划为寒武纪,有的划为奥陶系。1973—1978年我队在贾汪地区开展一比五万区
During the period from 1924 to 1939, Liu Jichen, Li Siguang and Xie Jialong surveyed coalfield geology and made some research work on Ordovician nearby. At that time, they were generally called “Ordovician Pearl River Delta Limestone ”and“ Ordovician Majiagou Limestone ”. For the strata in the lower part of the Ordovician and the Cambrian, Li Siguang (1930) named Jiawang Shale, and Xie Jirong (1932) under it named“ Sanshanzi limestone ”, these two strata era, and some classified as Cambrian, and some classified as Ordovician. From 1973 to 1978, our team carried out 150,000 districts in Jiawang area