Biostratigraphic correlation of the ten most important Permian-Triassic boundary sections throughout Tethys enables establishment of four conodont and ammonoid subdivisions within a stratigraphic interval, one to a few metres thick, representing less than I Ma. In ascending order, they are conodonts(Clarkina chargxingensis-C. deflecta Zone; Hindeodus typicalis Interval; Isarcicella parva Zone and I. isarcica Zone) and ammonoids(Pseudotirolites-Pleuronodoceras Zone, lower Otoceras Zonel, upper Otoceras Zone and Ophiceras Zone). Most of them can be traced to Notrh America and the Arctic region. Carbon isotope investigations of 24 sections along Tethys and in Greenland and Spitzbergen confirm the consistency of 813 C negative excursions at the Permian-Triassic boundary, together with an ineonsistent Ir anomaly. Eight sections show that in most cases there is a succession of: Ir anomaly (denoting the end-Permian catastrophic envirorment); 813C excursion (biomass loss, extinction); P/T boundary (origination of newcomers; potentially capable of intercontinental correlation within that short time interval). There is an intercontinental sequence boundary at the top of the Permian, and a transgressive surface at the P/T boundary followed shortly by a maximum flooding surface. An intercontinental anoxia event accompanied the transgression. Three delineations of the mass extinction phases and three population explosions have been recognized and can be more or less correlated in South China and the Southern Alps. Radiometric dating of the volcanogenic boundary clays of Meishan, Shangsi and the main-stage Siberian Tunguss Traps give an almost identical age of 250 Ma, thus implying a synchronous interregional volcanic event. There are a few palaeomagnetic transforms within the PTB strata. Thus, multidisciplinary research of the P/T boundary strata allows subdivision of this short interval into more than ten intercontinentally correlatable pars. Each subdivision averages less than 100ka in duration. This may be the highest resolution obtained so far in pre-Cretaceous rocks. High-frequency. Milankovitch-type cyclic deposits within the P/T boundary beds enable correlation of even higher resolution in the Lower Yangtze area. This high resolution is made possible because the P/T transition is a time of saltation and catastrophy in geological history. Causality of the aggregation of events merits further investigation.

本文根据古地理、古生物地理、古地磙、地球化学及火山岩工作成果，提出镇安-淅川地块是早古生代自南秦岭裂离而较早缝合于北秦岭南的一小型地块、早古生代秦岭是个多岛小洋盆，具有包括镇淅地块在内的五列岛屿。由于扬子、华北板块及其间列岛的同向不等速漂移，导致了缝合过程不同于经典的板块碰撞，这是特提斯多岛洋盆缝合的一大特点，以此解释东秦岭加里东期“碰撞而不造山”的问题。