准噶尔南缘—吐鲁番盆地晚二叠世—中三叠世早期二齿兽类的发育及生态环境探讨

DICYNODON AND ECOLOGICAL ENVIRONMENT OF LATE PERMIAN TO EARLY STAGE OF MIDDLE TRIASSIC AT JUNGGAR SOUTHERN MARGIN—TURPAN

准噶尔南缘—吐鲁番盆地晚二叠世—中三叠世早期地层中,共有5个岩组发现有二齿兽类化石.这些二齿兽类生活在河流—浅水湖泊的古地理环境中,伴随的古气候条件为热带—亚热带气候.该时期的“红层”可以作为热带—亚热带气候的标志之一.

Dicynodons were found in five formations of late Permian to early stage of Middle Triassic at Junggar southern margin—Turpan. The previous discovery of Lystrosaurus in Xinjiang was one of the proofs for continental drifting and plate tectonics. Based on Dicynodons?occurring horizons, assemblages and paleogeography, their ecological environment and sedimentology, paleogeography and paleoclimate are discussed in coupling with paleomagnetic data. The associated paleoclimate is tropical-subtropical. 揜ed beds?of this age are one of the markers of tropical-subtropical climate. Therefore, Dicynodon is a type of reptiles which live in rivers and shallow lakes of tropical—subtropical climate.