山东贾汪煤田附近四周高山,都是寒武奥陶纪地层所构成,露头清楚,层序整齐,最适合研究地层的地方。该地寒武奥陶纪地层,按其岩性及化石来说,可与南满及华北相比。兹分别叙述如下: 中奥陶纪地层,即马家沟灰岩,出露於煤田的边缘,厚约300-400米。顶上与石炭纪地层的含铁质紫红色泥质页岩成假整合接触,底下与贾汪页岩成整合接触。本层上部呈灰褐色厚层状灰岩,产Actinoceras sp.及Asaphus sp.。下部是灰色薄层矽质灰岩,未获化石。下奥陶纪地层,即分成贾汪页岩与三山子灰岩,前者说是页岩,实在是一种薄层状土黄色含泥质灰岩,厚约12米。後者原系谢家荣教授所命名,是一种灰或灰白色 The surrounding mountains around Jiawang Coalfield in Shandong Province are all formed by the Ordovician Cambrian strata of Cambrian. They are well-defined and well-ordered and most suitable for studying the strata. The Ordovician Cambrian strata in this area, according to its lithology and fossils, can be compared with the South Manchurian and North China. The following are described respectively: The Middle Ordovician strata, the Majiagou limestone, is exposed on the edge of the coalfield and has a thickness of 300-400 meters. On the top and Carboniferous strata of iron-containing purple argillaceous shale into false integration contact, the bottom into contact with Jia Wang Shale. The upper part of the layer is grayish brown thick layer of limestone, producing Actinoceras sp. And Asaphus sp. The lower part is gray thin layer of silicon limestone, no fossils. The Lower Ordovician strata, divided into Jia Wang shale and Sanshan Zi limestone, the former is shale, it is a thin layer of khaki muddy limestone, about 12 meters thick. The latter, originally named by Professor Xie Jialong, is a gray or off-white color