【摘要】 <正>新疆天山北麓、准噶尔盆地南缘陆相二叠、三叠系发育完好,尤以乌鲁木齐仓房沟至吉木萨尔一带剖面连续、化石丰富,是研究我国陆相二叠、三叠系层型剖面和层型界线的理想地区之一。据新疆地层表上二叠统至下三叠统的地层层序自上而下为:更多还原

【Abstract】 Through the primary study, the Ostracoda of Upper Permian Wutonggou Fm-Lower Triassic Jiucaiyuan Fm in Dalongkou and Xiaolongkou of Jmusaer county of Xinjiang is divided into three assemblages in the present paper (in ascending order):I . Darwinula-Panxiania-Suchonella-Darwinuloides assemblage. The assemblage consists of 4 genera 13 species. They were mainly found in the middle lower part of Upper Member of Wutonggou Fm from Dalongkou of Jimusaer county. It’s age is considered late Permian and may correspond to Upper Permian Tartar stage of USSR and Upper Member of Shiqianfeng Fm of Upper Permian, North China.II . Darwinula elongata-D. adducta assemblage. The fossils of this assemblage contain 1 genus 5 species. The assemblage is found in the upper part of Upper Member of Wutonggou Fm; It’s age is considered early Trassic.III. Darwinula triassiana-D. rotundafa assemblage. The assemblage is found in Jiucaiyuan Fm from Dalongkou and Xiaolongkou of Jimusaer county. It consists of 1 genus 7 species. It’s age is also considered early Triassic.In this paper, author also specially discusses Permian-Triassic boundary on the basis of Ostracoda, Estheria and Lystrosaurus found. Writer considered that Permian-Triassic boundary should move to down 75.8m (thickness) in the Dalongkou section and 42m (thickness) in the Xiaolongkou section.更多还原