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《Jiangsu Geology》 1990-01
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Fang Yiting Bian Lizhen (Department of Earth Science,Nanjing University)  
Definitions and concepts of strata proposed by others are discussed in this paper.The writers consider that the strata should include all kinds of rocks formed in the geological pe- riods.The paper says that the biostratigraphic boundary is rather obscure,the choronostrati- graphic boundary determined by the authorities is of legal feature and the lithostratigraphic boundary is a natural boundary. The paper proposes that the assemblage-zones should be used as the normal biostratigra- phic units while the range-zone and acme-zones should only be used as the innormal biostrati- graphic units.Finally.the new symbols for lithostratinraphic units are designed in the paper; that the biostratigraphic symbols should be defined in the stratigraphic Guide of China.
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