| 甘肃玉门下沟地区早白垩世下沟组介形类 |
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| 引用本文： | 胡艳霞,徐东来.甘肃玉门下沟地区早白垩世下沟组介形类[J].微体古生物学报,2005,22(2):173-184. |
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| 作者姓名： | 胡艳霞 徐东来 |
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| 作者单位： | 1. 济南大学城市发展学院,济南,250002;中国科学院南京地质古生物研究所,南京,210008
2. 山东省地矿工程集团有限公司,济南,250013;山东省地勘局测绘院,济南,250011 |
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| 摘 要： | 甘肃玉门下沟地区下沟组介形类化石十分丰富,该地区下沟组介形类化石共计9属4亚属,21种,本文描述了其中4新种,即Cypridea(Cyamocypris)xiagouensissp.nov.,Cypridea(Cypridea)subunicostatasp.nov.,Stenestroemiasubpeculiarissp.nov.和Stenestroemiaxiagouensissp.nov.。该介形类化石组合尤以Cypridea最为繁盛,通过分析介形类属种的形态特征和化石组合特征并结合岩性特征,推断下沟组的地质时代为早白垩世巴列姆期;并认为下沟组为水动力较弱的淡水-微咸水河湖相沉积。
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| 关 键 词： | 介形类 早白垩世 下沟组 玉门 甘肃 |
| 修稿时间： | 2004年12月14 |
EARLY CRETACEOUS OSTRACODS FROM THE XIAGOU FORMATION IN XIAGOU, GANSU PROVINCE |
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| HU Yan-xia,XU Dong-lai.EARLY CRETACEOUS OSTRACODS FROM THE XIAGOU FORMATION IN XIAGOU, GANSU PROVINCE[J].Acta Micropalaeontologica Sinica,2005,22(2):173-184. |
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| Authors: | HU Yan-xia XU Dong-lai |
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| Institution: | HU Yan-xia1,2) and XU Dong-lai3,4) 1) Faculty of City Development,Jinan University,Jinan 250002 2) Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008 3) Shandong Provincial Geo-Mineral Engineering Co. Ltd. Jinan 250013 4) Shandong Provincial Institute,Jinan 250011 |
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| Abstract: | Fossil ostracods of the Xiagou Formation are abundant in Xiagou area, Yumen, Gansu. The ostracod fauna is dominated by species of Cypridea, including 21 species in 9 genera and 4 subgenera, of which 4 new species are described here. According to the ostracod characteristics and the stratigraphic correlation, the Xiagou Formation is regarded as Barremian of Early Cretaceous in age. In addition, based on the surface structures from the carapace and valve of these ostracods, and lithologic characteristics of the Xiagou Formation in Xiagou Area, the result indicate that the Xiagou Formation bearing ostracods might have been deposited under the shallow fresh to brackish lacustrine or fluvial environments. |
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| Keywords: | Ostracods Xiagou Formation the Early Cretaceous Yumen Gansu |
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