Helenifore Robustum Radiolarian Fauna from the Hanjiga Formation, Middle Tianshan, Xinjiang, China and the Chronostratigraphic Significance
详细信息
- 责任者：Wang Yujing (Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Duan Bingxin
- 刊名：Acta Micropalaeontologica Sinica
- 出版年：2013
- 卷期：30(3)
- 关键词：放射虫类 ; radiolarians ; 动物群研究 ; faunal studies ; 年代地层学 ; chronostratigraphy ; 天山 ; Tianshan Mountains
- 页码：p.217-227
- 图表：2 illus., 1 plate, 57 refs.
- 分类号：1102
- issnNo：ISSN1000-0674
- isbnNo：CN32-1189/Q
摘要
The Hanjiga Formation is a Devonian stratigraphic unit in Wenquan area of Middle Tianshan,Xinjiang,China which consists of marine clastic deposits with the intercalary of the volcanic clastic rocks.Rich Middle Devonian coral and brachiopod fossils have been found in the limestone lumps and gravels of this formation.Recently,the Helenifore robustumradiolarian fauna of late Frasnian,Late Devonian,is discovered in the cherty lens of the upper Hanjiga Formation.Therefore,regarding the age of the Hanjiga Formation,we suggest(1)because the Middle Devonian coral and brachiopod fossils were separately found in the limestone lumps and gravels in the Hanjiga Formation,they do not represent the age of the formation;(2)the late Devonian radiolarians reported herein most likely represent the age of the Hanjiga Formation,i.e.,late Frasnian.Five radiolarian genera and 11 species,belonging to 3 orders and 4 families,are described in this paper.
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