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四川盆地晚三叠世———老第三纪陆相地层十分发育,为一套基本上是连续的河流相间有湖泊相沉积层,厚数千———万米以上。含植物、瓣鳃、腹足、叶肢介、介形类及爬行类,鱼类化石。三叠系与侏罗系界线可置于须家河植物群与珍珠冲植物群及以蕨类孢子占绝对优势与以克拉梭粉占绝对优势的两孢粉组合之间。侏罗系与白垩系界线可置于 Djungarica postiacu-
The Late Triassic-old Tertiary terrestrial strata in the Sichuan Basin developed very well. They are a set of lacustrine facies sediments that are basically continuous river flows and thicknesses of thousands of meters or more. Contains plants, flap gills, gastropods, leaf extremities, mesoids and reptiles, fish fossils. Triassic and Jurassic boundaries can be placed in the Xujiahe flora and pearl Chong flora and in absolute superiority to the fern spore and the absolute domination of the triptolide powder between the two sporopollen combinations. Jurassic-Cretaceous boundary line can be placed in Djungarica postiacu-