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《JOURNAL OF STRATIGRAPHY》 1995-03
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The Early and Middle Jurassic strata in the Neiwugi area, Xizang(Tibet)

Guo Jianjiang (Regional Geological Surveying Team, Sichuan Bureau of Geofogy and Mineral Resources, Shuangliu, 610213).  
In this paper, the Early and Middle Jurassic strata in the Neiwugi area, Xizang are divided into the Renqingka Group below and the Yanshiping Group above. The Renqingka Group is established by the present author to represent the terrigeneous variegated elastic rock formations of the Early Jurassic regressive sequence and divided ascendingly into the Longzaida, Qumai and Aimal Formations. Hiatella arenicola and elements in the Hunan and Jiangxi area. This group conformably overlies the Triassic rocks and conformably underlies the Middle Jurassic rocks. The Yanshiping Group represents the carbonte rock formation of the Middle Jurassic transgressive sequence and is divided asscendingly into the Huonai, Jienong Beiteng and Riasba Formations. The lithological and biological characters of these stratigraphic units and their geologcal ages are described and discussed also in this paper in order to reflect the latest advance in study.
【CateGory Index】: P534
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