西准噶尔吾尔喀什尔地区早-中志留世生物化石的发现及意义

Discovery and Significance of Early-Middle Silurian Fossils in the Wuerkashier area of Western Junggar

西准噶尔吾尔喀什尔山北缘志留纪地层主要发育滨-浅海相碎屑沉积岩和火山碎屑岩建造,以往资料将其划分为中—上泥盆统。该区原划为上泥盆统塔尔巴哈台组的一套地层中发现大量早—中志留世化石,结合岩性组合特征,将该套地层划为早—中志留世恰尔尕也组。该组化石的发现对吾尔喀什尔地区早—中志留世生物组合特征、志留纪地层划分、对比、沉积环境及区域地质演化提供了新证据。

A suit rock of shore-neritic facies clastic sedimentary deposited in Silurian,in north Wuerkashier Mountain, western Junggar.It is divided into the Middle-Late Devonian Taerbahatai Formation in the past data.However many fossils belonging to the Early-Middle Silurian was founded there,that was an exact evidence for the strata age.Combined with the feature of rock assemblages,it should divide into the Early-Middle Silurian Qiaergaye Formation.The new discovery materials provides the important evidence for identifying Early-Middle Silurian biology combination,distinguishing and contrasting the Silurian strata,comparison,studying sedimentation environment and regional geological evolution in the Wuerkashier Mountain.