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论述了内蒙古西部阿拉善地区上新统的分布、岩性、岩相特征,以及在该地层中首次发现的双壳类、腹足类化石,并据岩性和古生物研究建立昂冈浩特组。 相似文献
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腹足类口盖化石在我国中、新生代陆相地层中分布广泛,丰富而且类型多,但目前还没有系统的口盖化石分类,作者将它们按动物分类学的方法建立口盖化石分类系统,便于对口盖化石进行比较研究和鉴别。 相似文献
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官庄群主要出露于鲁西南地区的平邑盆地和蒙阴盆地,由于盆地范围较小,岩性横向变化大,地层划分对比较为困难,加之露头区植被覆盖严重,以往发现的生物化石较少,时代归属上各家观点不一。在野外剖面实测及钻井剖面系统采样分析的基础上,依据所获大量的介形虫、轮藻和腹足类化石(其中许多系首次发现),与国内外同期沉积盆地进行了横向对比,提出与以往地层划分意见相比有重大改动的新方案,即:鲁西南地区官庄群固城组和卞桥组底部地层属上白垩统,卞桥组其余部分属下古新统,常路组为中、上古新统,朱家沟组为下始新统,大汶口组划归下始新统至中始新统。 相似文献
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<正> 临江组共分四个岩性段,地表剖面位于江西清江县临江镇南,仅出露三个岩性段,现按沉积序列,对三个含腹足类化石丰富的层段进行沉积环境讨论。1)临一段第2层 紫红色块状钙质粉砂质泥岩,普遍含钙质结核和团块,微层理发育,近顶部20cm层中含丰富的腹足类及口盖,腹足类多已破碎。主要为Valvata of. parviumbilicata 相似文献
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鄂西地区泥盆纪地层分布广泛,剖面完好,化石丰富,是我国晚泥盆世早期黄家磴阶建阶地区。 泥盆纪叶肢介化石在国外有少数报道,在我国除晚泥盆世晚期有报导外,晚泥盆世早期至今没有发现和报导。因此,鄂西地区上泥盆统下部黄家磴组叶肢介化石的首次发现,不仅对于研究叶肢介的演化。地层时代和地理分布有重要意义,而且对丰富黄家磴组生物内容也是重要的。 黄家磴组化石孢子十分丰富,计30余属,70余种、由于篇幅所限,仅部分予以报道,特别有意义的是在叶肢介化石同一标本所发现的孢子,对于沉积环境、动植物群之间的关系等研究提供了线索,并且增添了新内容。 相似文献
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本文报道的科姆藻化石,发现于湘中地区下二叠统茅口组顶部P_1M~4层含放射虫泥晶炭泥质硅质岩中,在新化及邵东地区不仅含量高,而且保存完好,是划分地层的重要标志,是研究科姆藻化石的重要新层位。与科姆藻化石共存的其他生物化石有(虫廷)科、有孔虫、假儒孔藻、翁格达藻、苔藓虫、腕足类、腹足类、介形虫及棘皮动物等。 相似文献
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本文介绍了广东西部德庆地区近年来新发现的一个晚奥陶世动物群,包括化石产出层位、生物组合类群及其科学意义。该动物群产自原划分为中奥陶世东冲组的地层内,化石产出层位岩性为泥质粉砂岩,动物类群以三叶虫为主,伴生有腕足动物、棘皮动物及少量短剑类化石,化石保存多较破碎,仅少部分保存较好,分布非常集中,结合野外露头与沉积相特征,其沉积环境为正常浪基面至风暴浪基面间的高能滨浅海环境。该动物群的发现,不仅厘定了这套地层时代,而且丰富了粤西地区晚奥陶世的生物组合面貌,为该地区奥陶系的划分对比和区域地质演化研究提供了新资料。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献
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正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37 相似文献
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正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.) 相似文献