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“西永一井”位于我国广东省西沙群岛的永兴岛上。是石油工业部南海石油勘探指挥部组织钻探的。钻井揭示的地层有第四系、上新统和中新统。为浅海碳酸盐岩沉积,主要是一套生物礁灰岩、白云质灰岩,局部层段夹有白垩。含有丰富的有孔虫、腹足类、钙藻及珊瑚等化石,总厚度为1200多米,覆盖在前寒武纪花岗片麻岩之上。 在分析有孔虫化石的过程中,我们发现了介形类化石,经张锡南、梁名胜和陆秀芳等同志研究,并经中国科学院南京地质古生物研究所陈德琼同志和地质部宜昌地质矿产研究所关绍曾同志的审定,共有8科13属24种。其中一个未定属(可能为新属)、5个新种和7个未定种。介形类化石主要产在上新统,其次是第四系,中新统少见。 第四系见有:
“West Wing a well” is located in Yongxing Island, Xisha Islands, Guangdong Province, China. Is the Ministry of Petroleum Industry South China Sea Petroleum Exploration Command organized drilling. The formations revealed by drilling are Quaternary, Pliocene and Miocene. For the shallow sea carbonate deposition, mainly a reef limestone, dolomitic limestone, local layers of chalk. Rich in foraminifera, gastropods, calcareous algae and corals and other fossils, the total thickness of more than 1200 meters, covering the Precambrian granite gneiss. In the process of analyzing foraminifera fossils, we found that the fossils of the mesoxids are studied by comrades Zhang Xini, Liang Jusheng and Lu Xiufang, and comrades Mr. Chen Deqiong from Institute of Geology and Palaeontology, Chinese Academy of Sciences, and Mr. Guan Shaozeng from Yichang Institute of Geology and Mineral Resources, Ministry of Geology Of the validation, a total of 8 families 13 genera and 24 species. One of the undetermined (may be a new genus), five new species and seven undetermined species. Ostoid fossils are mainly produced in the Pliocene, followed by the Quaternary, the Miocene rare. Fourth Department see: