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The book contains four parts. As the first part of this work, the authors checked all conodonts from the PTB sections of Meishan, Shangsi and Kashmir, and corrected those incorrectly identified. They also revised the conodont zones of the P-T transition (Beds 24e to 28 of Meishan section). In the second part of this work, using an approximate method (“reef representatives”), they determine the distribution area of reefs in the Permian and Triassic. In the third part, on the basis revision of all thalamid sponges from the Permian and Triassic at specific level and discussed their evolution. In the last part, they discussed the biotic (taxonomic) selection in the end-Permian mass extinction of marine invertebrate groups and terrestrial plants. On the basis of evidence from different disciplines, especially oxygen isotopic evolution of seawater, global sea-level changes, and biotic selection in the mass extinction, they discussed the possible cause of the end-Permian mass extinctions.

【Main Contents】

1. Conodots and Conodont Zones Across the Permian-Triassic Boundary: the GSSP and Related Sections
   1.1 Introduction
   1.2 General features of the PTB sections and their correlations
   1.3 Revisions on the conodonts from the PTB sections
   1.4 Revision on the conodont zones of PTB interval
   1.5 Descriptions of new taxa
2. Permian-Triassic Evolution of Reefs: Extinctions
   2.1 Introduction
   2.2 Reefs in different periods of the Permian and Triassic Periods
   2.3 Comparison of the distributions, sizes and composition of the reefs in different periods
   2.4 Implication of P-T evolution of reefs: catastrophic events
3. Permian-Triassic Evolution of Reefal Thalamid Sponges: Extinctions
   3.1 Introduction
   3.2 Permian-Triassic evolution of reefal thalamid sponges
   3.3 Comparison of the reefal thalamid sponges faunas of different periods
4. Biotic Selection and Cause of End-Permian Mass Extinction
   4.1 Glacier distribution
   4.2 Sea-level change
   4.3 Change in δ18 O seawater
   4.4 Taxonomic selection in the end-Permian mass extinction
   4.5 Conclusion

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