以四川盆地西部上三叠统须家河组的砂岩组分为基础，详细分析该期研究区古地理的演化。
Based on the sandstone compositions analysis of the Upper Triassic Xujiahe Formation in Western Sichuan Basin, the authors tried to discuss the paleogeographic evolution of the study area.
本区古地理的演变过程是：由更新世的陆地环境，经过全新世的海侵，变为现今的滨海环境。
The process of paleogeographic evolution in this area is from land of pleistocene epoch to ingression of holocene epoch, then to littoral circumstances of today.
化石也可向我们提供史前的古地理和古气候情况，并可指示埋藏它们的岩石的年龄。
Fossils also provide information about the geography and the climate of prehistoric times, and indicate the age of rocks in which they are found.
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