PRELIMINARY STUDY OF GEOCHEMICAL CHARACTERISTICS AND FORMATION OF ORGANIC MATTER RICH STRATIGRAPHY OF XIAMALING  FORMATION OF LATER PROTEROZOIC IN NORTH CHINA
陈践发,孙省利
Natural Gas Geoscience . 2004, (2): 110 -114 .  DOI: 10.11764/j.issn.1672-1926.2004.02.110