| 江苏宁镇山脉仑山灰岩的新认识 |
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| 引用本文： | 许汉奎.江苏宁镇山脉仑山灰岩的新认识[J].地质科学,1976,11(3):235-245. |
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| 作者姓名： | 许汉奎 |
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| 作者单位： | 中国科学院南京地质古生物研究所 |
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| 摘 要： | “仑山灰岩”标准地点在江苏南部句容县的仑山。1933年,俞建章在研究“仑山灰岩”中的头足类动物群时,曾指出:“仑山灰岩”的时代应属于早、中奥陶世。1935年,李捷等在系统研究宁镇山脉地质时,对“仑山灰岩”重新进行划分,把上部含鞘角石(Vaginoceras)动物群的灰岩归入中奥陶统,称汤山灰岩。
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NEW RECOGNITION OF THE LUNSHAN LIMESTONE IN THE NANJING HILLS, SOUTHERN JIANGSU |
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| Xu Hankui.NEW RECOGNITION OF THE LUNSHAN LIMESTONE IN THE NANJING HILLS, SOUTHERN JIANGSU[J].Chinese Journal of Geology,1976,11(3):235-245. |
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| Authors: | Xu Hankui |
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| Institution: | Nanjing Institute of Geology and Paleontology, Academia Sinica |
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| Abstract: | The "Lunshan Limestone", typically located at Lunshan in Jurong County, Jiangsu province, it was subdivided in 1935 by Li Jie et al. into two parts. Its upper part containing Vaginoceras cephalopod was termed the Tangshan Limestone, belonging to Middle Ordovician; while its lower part yielding Cameroceras cephalopod was denominated as the Lunshan Limestone, belonging to Lower Ordovician.In 1959, Yu Jianhua, etc. of Nanjing University found Middle Cambrian Pro-bowmania (Mufushania) and Lower Cambrian Redlichia from the Lunshan Limestone in the Mufushan, near Nanjing. Accordingly, they created two formation names: the Paotaishan Formation and the Mufushan Formation, belonging respectively to Middle Cambrian and Lower Cambrian.The present writer, when carrying out researches in the Lunshan Limestone at the Nanjing Hills in 1964 and 1974, drew a conclusion that the Lunshan Limestone may be divided into the following six parts:Superformation: "The Tangshan Formation" (Llanvirnian-Lower Caradocian)Conformity6. The Da Wan Formation (Upper Arenigian) : Light-gray or reddish-gray thickbedded Limestone, yielding "Mimella" formosa (Wang), Yangtsella poloi (Martelli), Sinorthis typica Wang, Diparelasma silicumUlrich et Cooper, "Hesperonomia" striata Xu, and Leptella spabout 20 m.5. The Honghuayuan Formation (Lower Arenigian) : Dark gray thick-bedded limestone, containing Diparelasma nanjingensis Wang and Xu, Tritoechia tangshanensis Wang et Xu, T. turritella Wang et Xu, Punctolira orien-talis Wang et Xu, P. sinensis Wang et Xu, and Hopeioccras mathieui(Grabau) 80 m.4. The Lunshan Formation (Tremadocian) : Dark gray thick-bedded limestone, with little dolomitic limestone at the lower part, yielding at the bottom Apheoorthis sp., Nanorthis sp., Imbricatia sp., Syntrophinella sp., Szechuanella szechuanensis Lu, Dactylocephalus dactyloides Hsu and?Hopeioceras sp 120 m.3. The Loushanguan Formation (Upper Cambrian) : Gray-white thick-beddeddolomite 283 m.2. The Paotaishan Formation (Middle Cambrian) : Dark gray thick-bedded limestone, interbedded with thin-bedded dolomitic limestone, containing Probowmania (Mufushania) changi Lin, and P. (Mufushania) nanjingensis Lin at the lower part 130 m.1. The Mufushan Formation (Lower Cambrian) : Black carbonaceous shale in the lower part and dark gray thin-bedded limestone or dolomitic limestone in the upper part, yielding Redlichia sp. and Paokannia sp. at thetop part 180 m.ConformitySubf ormation: The Dengying Formation (Sinian System)The Cambro-Ordovician deposits in Southern Jiangsu nearly correspond with those in Hubei and northern Guizhou, both belonging to the Yangtze Province. |
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