Significance of Early Cretaceous index fossils from Risong villages of Tibet
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摘要: 研究区位于西藏阿里日松乡一带。岩性组合、沉积环境、古生物特征的详细研究为该地区中生代地层的时代归属提供依据。在日松乡日买栋纳一带原1:25万日土县幅侏罗系中发现了大量扁平古圆笠虫和小星准柱珊瑚等早白垩世标准化石,这些化石的发现对研究区地层的时代归属提供了强有力证据。结合地层的初步沉积环境分析可知研究区早白垩世为残余海盆地沉积阶段。Abstract: The study area is located in Risong villages of Tibet. In order to provide the basis for Mesozoic stratigraphic age in this area, lithology combination, sedimentary environment, paleontological characteristics were studied. A lot of Early Cretaceous index fossils, such as Orbitolina (Palorbitolina)complanata and Stylina parvistella Volz, were found in the Jurassic strata in the 1:250 000 geological survey in Ritu County. These fossils provided strong evidence of the division of stratigraphic age in this area. Combining with analysis of sedimentary environment, the conclusion can be made that sedimentary facies in early Cretaceous of this area developed in residual sea basins.
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Keywords:
- Orbitolina(Palorbitolina)complanata /
- Stylina parvistella Volz /
- Early Cretaceous /
- Ali /
- Tibet
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