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A systemation study of internal structure, ontogenesis, evolution, assemblage and distribution of a great deal of the Late Palaeozoic Rugose corals are made. Affinities, assemblages and sequences of some genera are put forward on the basis of carbon and oxygen isotope compsition of coral skeleton. Sedimentary facies in Xizang and its adjacent region is divided into Palaeotethysan neritic facies, Slope facies and Gondwanan facies.
Palaeotethysan neritic facies: The Rugose corals are very rich, and they are dominated by the elements with dissepiments. The Coexistent fossils: With representatives of almost all the classas. Their carbon and oxygen-isotope values are generally shown by a small positive figure and a middle negative figure (see Table 3-8).
Slope facies: The Rugose corals are sparse, most of them are small solitary without dissepiments. The coexistent fossils: With conodonts except the adaptable and cryophilic elemens. Their carbon-isotope values are very small positive figure, the oxygen-isotope values are middle negative figure (See Table 9)
Gondwanan facies: At the beginning of the glacial action, almost all Rugose corals are small solitary without dissepiments, The coexistent fossils are only the strongly adaptable and cryophilic elemens such as Zaphrentites, Eurydesma, Trigonotreta and Stepanoviella; the conodonts almost no appear in the existence of the giacial action. The carbon isotope values are middle negative figure, the oxygen-isotope values are large negative figure (see Table 11). In late Carboniferous, the glacial action was very intense, the Rugose corals are sparse and no dissepiments, their carbon and oxygen-isotope values are all larger negative (see Table 12). On the hand, when the glacial action was not appeared and should be conclued, the Rugose corals except no dissepiments ones, may are appeared solitary and compound with dissepiments, their carbon and oxygen-isotope values are similar to those of Palaeotethysan neritic facies (see Table 10, 13, 14).
Biogeographical region for the Late Palaeozoic Rugose corals is divided into Boreal Realm, Palaeotethysan Realm and Gondwanan Realm which are subdivided into Province. This monograph believes that the boundary between the Palaeotethysan and the Gondwanan Realm (Landmasses) from the Early Carboniferous to the early of Middle Permian was Huorparco to Dongqiao and Nujiang fault. In the late or Middle Permain (maokou Age), northwards moving the Indian plate went into the Palaeotethysan Realm which resulted in Palaeotethysan deposit containing a great amount of compound corals with dissepiments, and hermatypic corals.
These furnish convincing palaeobiologicla proof to the research on the Late Palaeozoic geological framework, stratigraphy (stratigraphical divisin and correlation), taxonomy of Rugose corals and geological history, and to the recognition of sedimentary environment at that time in Xizang and its adjacent regions.

1. Stratigraphic Regionalization And Description Of Section
2. The Sequence And Assemblage Zone Of Rugose Corals
3. Characteristics and distinction of rugose corals in the palaeoteth-ysan neritic facies, slope facies and gondwanan facies
4. Composition ofcarbon and oxygen isotopes for the rugose corals in various biofacies
5. Biogeographical regions of the rugose corals
6. The affinities of some rugose corals
7. Restatement on the classification of wentzelellina
8. Description of corals
(1) Order Cystiphyllida Nichoson, 1889
(2) Order Streptelasmatida Verrill, 1865
(3) Suborder Hallina Chapman, 1893
(4) Order Columnariida Soshkina, 1941
(5) Suborder Endophyllina Torley, 1933
(6) Suborder Cyathophyllina Nicholson, 1889
(7) Order Metriophyllida Spasskiy, 1965
(8) Suborder Plerophyllina Sokolov, 1960
(9) Suborder Stereolasmatina Hill, 1981
(10) Order Caniniida Wang, 1950
(11) Suborder Caniniina Wang, 1950
(12) Suborder Aulophyllina Hill et al; 1981
(13) Suborder Lithostrotionina Spaskiy et Kachanov, 1971
(14) Suborder Lonsdaleiina Spasskiy, 1974, emend.X. Yu, 1989
(15) Suborder Wentzelellina Ding et al., 1995
(16) Order Mesocorallia C.C. Yu, 1963

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