Therefore, the Shansonggang flora is considered to be Early Early Jurassic in age.

Through analyzing the sedimentary environment properties in Sichuan Basin during Da anzai Age of Early Jurassic Epoch,a theoretical model of lake basin sequence in Da anzai Age is set up,the actual sedimentary sequence properties of Da anzai Formation are discussed and then the sequence units are further divided in the paper.

Early Jurassic Zircon SHRIMP U-Pb Age of the Dacitic Volcanic Rocks in the Southeastern Zhejiang Province Determined Firstly and Its Geological Significances;

Late Triassic and Early Jurassic Ammonoids from Eastern Himalayas;

Early Jurassic sporopollen assemblages from the Toksun subbasin in the Turpan-Hami basin, Xinjiang and their significance;

By a comprehensive comparison of its basic characteristics, it is believed that it was formed during late Triassic epoch-lower Jurassic, about 213～192 Ma.

The age of the flora is the early Middle Jurassic──Bajocian to early Bathonial.

Sedimentary Characteristics and Model of Early-Middle Jurassic in Jiyang Depression;

Synthetically analyzed the fracture, earthquake, coal ranks and their distribution, coal seam抯 buried depth and so on, the authors have realised that low-rank bituminites, early-middle Jurassic in Tianshan area, are formed by burial metamorphism, and it is widespread.