蓟县长城系高于庄组宏观生物化石的发现

蓟县桑树鞍村附近长城系高于庄组找到的宏观化石,呈单体,棕褐色带状含有机质薄膜。可能属于原始的藻类,定为1新属Sangshuania Du (gen. nov.),两个新种Sangshuania sangshuanensis Du (gen. et sp. nov.), S. linearis Du (gen. et sp. nov),前一种为旋曲状,后一种为直线状和蛇曲状。含化石层位的同位素年龄大约为1430Ma。化石的分类位置尚难确定,就其保存状态、形态、大小和时代等,可与北美贝尔特超群的腊瓦里群格雷松页岩大型藻类相近似,但也不能排除为其他生物或遗迹化石的可能性,该化石可能为我国晚前寒武纪,时代最老的宏观化石。     

北京及邻区青白口纪化石生物相研究

笔者综合新元古界青白口系典型剖面－北京西山芹峪剖面和北京昌平十三陵剖面新发现的宏观藻类化石及邻区相应层位中的化石资料,通过生物相分析认为,北京西山青白口、芹裕的宏观藻类化石可能产于静水泻湖相中;而北京昌平十三陵的宏观藻类化石组合则反映出具有水下冲积型环境的特色;在河北怀来所发现的极完整又丰富的化石可以代表正常的滨海潮坪环境。因此,笔者认为青白口纪微古植物和宏观藻类化石在区域丰度和形态变化方面与水深     

贵州台江中寒武世凯里组中分枝状宏观藻类化石

本文描述了贵州中寒武世凯里组中的分枝状宏观藻类化石5属7种，即：Marpolia spissa Walcott,Marpolia aequalis Walcott,Guizhouella ramulosa Yang(gen.et sp.nov.),Doushantuophyton lineare Chen,Thamnophton formosus Yang(gen.et sp.nov.),Eoulothrix fibrillata Ding,Eoulothrix flabellophyton Yang(sp.mov.)。根据大量的藻类与凯里生物群共生特征，从藻类的生态及生物群分布受到沉积韵律控制等特征分析，认为凯里生物群生活环境的水深应该在30－60m，而埋藏和保存环境的水深是150m左右。另外，将凯里生物群中的宏观藻类化石与震旦纪陡山沱期的藻类化石进行了比较，两者在以分枝状藻类占主要组成上是相似的，从这一方面来说，晚震旦世宏观藻类与寒武纪宏观藻类没有大的演变，但寒武纪宏观藻类以出现钙质珊瑚藻类、分枝更加复杂的类型和具有锯齿状叶状体、生殖托构造的藻类为特征。     

燕辽地区中、晚元古代宏观藻类化石研究

以蓟县中、上元古界层型剖面所产宏观藻类化石为重点 ,兼顾京冀辽等邻区 ,全面总结和系统讨论了该区中、晚元古代宏观藻类化石的研究简史、产出层位、区域分布、化石组合、生物群特征、可能的系统分类 ,以及国内外对比与地层学意义 ,初步探讨了宏观藻类植物群在中、新元古代的发生、发展与更迭 ,追索宏观真核生物起源等。通过对燕辽地区中、新元古代宏观藻类的研究与总结 ,把显生宙行之有效的生物地层学方法运用于前寒武纪地层研究中 ,进行国内外前寒武纪地层的对比 ,显然具有重要的地层学意义。同时 ,对探讨地球早期生命演化也具有重要的理论意义     

燕辽地区中、晚元古代宏观藻类化石研究

以蓟县中、上元古界层型剖面所产宏观藻类化石为重点，兼顾京冀辽等邻区，全面总结和系统讨论了该区中、晚元古代宏观藻类化石的研究简史、产出层位、区域分布、化石组合、生物群特征、可能的系统分类，以及国内外对比与地层学意义，初步探讨了宏观藻类植物群在中、新元古代的发生、发展与更迭，追索宏观真核生物起源等。通过对燕辽地区中、新元古代宏观藻类的研究与总结，把显生宙行之有效的生物地层学方法运用于前寒武纪地层研究中，进行国内外前寒武纪地层的对比，显然具有重要的地层学意义。同时，对探讨地球早期生命演化也具有重要的理论意义。     

湖北峡东地区灯影组石板滩段微化石

本文研究了发现于湖北峡东地区，震旦系灯影组石板滩段燧石夹层岩石薄片中的微古植物化石，包括１０属５种（其中１新属新种）和５个未定种，石板滩段黑色薄层灰岩以富含宏观藻类及碳质印膜和少量后生动物而闻名，我们在燧石夹层牟岩石薄片中，不仅发现上述宏观藻类，而且首次发现共生的微化石。及其他保存很好的微化石，这一发现进一步丰富 我国震旦纪的古生物资料，为地层对比提供了依据。     

地学园地

发现最古老多细胞藻类化石 本刊讯 地矿部天津地矿研究所最近提交的一项研究成果确认,1993年在天津蓟县中上元古界发现的叶状宏观化石,是迄今已知最古老的多细胞藻类化石,也是最古老的后生生物代表。     

浙江天台盆地蛋化石与恐龙的绝灭

综合报道了浙江天台盆地产出的蛋化石，其中包括新建立的龟鳖化石蛋科(新科)Tesmdoolithidae ram. nov.和天台蛋属(新属)Tiantaioolithus gen. nov.,以及5个新种：Dendroolithus shuangtangensis sp. nov.,Elongatoolithus chichengshanensis sp. nov,Elongatoolithus laijiaensis sp. nov,Spheroolithus jincunensis sp. nov,Tiantaioolithus jiangi sp. nov。这批蛋化石以赤城山组出现的类型最为丰富，有长形蛋、树枝蛋、圆形蛋、龟鳖类化石蛋等；赖家组蛋化石数量少，仅见长形蛋和圆形蛋类，其时代均为晚白垩世。推测天台蛋化石消失的原因是由于气候变冷，受精卵不能正常孵化所致。孵化率降低，生殖链打断，可能是引起恐龙绝灭的原因之一。     

湘西震旦系留茶坡组炭质宏化石初步研究

初步研究表明,留茶坡组中部黑色页岩中化石呈炭质压膜状保存,主要包括长绳状或带状宏观藻：Chenlidenella spiralis gen.et sp.nov.,Longifuniculum dissutum Steiner,Erdtmann and Chen,1992,Longitaenina triphyllus gen.et sp.nov.,L.rhodina gen,et sp.nov.,L.lanceolatus gen.et sp.nov.;直立不分枝的管状 宏观藻Longfengshania elongata Duan et Du,1985,L.elliptic-ulum sp.nov,Paralongfengshania oblong sp.nov.Miaohenella hunanensis(Steiner,Erdtmann and Chen,1992),M.rhomba Ding,1996,M.taenina sp.nov.,Cystoculum catenuatus gen.et sp.nov.;末端存在二歧式分的丝状宏观藻：Sectoralga bibarb atus sp.nov.,S,typica Hu,1996,S.capillaceus sp.nov.,S.umbellulata Hu,1996和水母状化石Taoyuania ovatoides gen.et sp.nov.,Liaonanella giganta sp.nov.,Wulingshania canopse gen.et sp.nov.及蠕虫状化石Wenshanwania simplex gen.et sp.nov.等。从地层对比上看,上述化石可能与伊迪卡拉动物群为同一时期的产物。晚震旦世晚期留茶坡组中类水母化石的出现是我国晚震旦世生物演化史上一次重要事件,以类水母等软躯体动物和高分异度的宏观藻类共同繁盛为特色的生物群与国内外同期地层中的已知生物群面貌不同,显示出一种新的伊迪卡拉庭园,为此,本文将棋其合名为武陵山生物群。     

贵州瓮安震旦系陡山沱组磷酸盐化疑源类化石新材料

贵州瓮安磷矿震旦系陡山沱组磷质岩中含有丰富的磷酸盐化疑源类化石，化石个体大，具形态多样的刺饰和多层结构的外壁，与峡东地区同期硅化疑源类组合总体特征相似，可直接对比。本文系统描述了在贵州瓮安磷矿陡山沱组新发现的疑源类化石4属4种，其中包含新属2个，新种2个，未定种1个。它们是Bacatisphaera baokangensis Zhou，Brasier et Xue，2001，Taeniosphaera doushantuoensis gen．et sp．nov．、Rugospinasphaera speciosa gen．et sp．nov．和Meghystichosphaeridium sp．。新材料的发现丰富了瓮安生物群的化石内容，为研究震旦纪陡山沱期海洋微体浮游植物群特征提供了重要的化石资料。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861     

ENGINEERING GEOLOGY

正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.)