科达穗和羽杉化石在新疆准噶尔盆地南缘的发现

近年来,笔者在系统研究了新疆准噶尔盆地南缘的古生代植物化石后,发现了两种早已绝灭了的科达(Cordaites)的生殖器官化石,一种是长苞科达穗(Cordaianthus volkmannii(Ett.)Zeiller),另一种是短苞科达穗(比较种)(Cordaianthus of.curtus Sze);同时还发现了一种最古老的松柏类化石——双羽杉(比较种)(Walchia of.bipinata Gu et Zhi)这些化石产生在准噶尔盆地南缘的乌鲁木齐市东南的下芨芨槽子群中,其地质时代隶属於早二叠晚期(P₁²)。

THE DISCOVERY OF CODAIANTHUS AND WALCHIA IN DZUNGARIA BASIN,XINJIANG

This paper deals with the fossil plants from Lower permian in Dzungaria Basin, Northern Xinjiang. These plants include two species of Cordaianthus, Cordaianthus volkmanii (Ett.) Zeiller and Cordaianthus cf. curtus Sze, They are represent strobilus of cordaites. This strobilus belongs certainly to the reproductive organ of Cordaites. The Genus Cordaianthus was first discovered by Grand' Eury in 1877. In this paper two species of Cordaianthus are all described.They were collected from Lower Jijicaozi Group. Ulumqi sou-theast in Xinjiang. One species of Conifers,?Walchia cf. bipinala Gu et Zhi,recorded in the present paper was discovered in Lower jijica-ozi Group. The former is an important index fossil in Lower permian of Euramerica and the first discovery in Xinjiang.