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EARLY CRETACEOUS OSTRACODS FROM THE XIAGOU FORMATION IN XIAGOU, GANSU PROVINCE
Author(s): HU Yan-xia, XU Dong-lai
Pages: 173-
184
Year: 2005
Issue:
2
Journal: ACTA MICROPALAEONTOLOGICA SINICA
Keyword: 介形类; 早白垩世; 下沟组; 玉门; 甘肃;
Abstract: 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)xiagouensis sp.nov.,Cypridea(Cypridea)subunicostata sp.nov.,Stenestroemia subpeculiaris sp.nov.和Stenestroemia xiagouensis sp.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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