新疆克尔哈达中志留世放射虫

从采自新疆托里县的克尔哈达的一块凝灰质粉砂岩中获得了中志留世放射虫化石１４属１５种（含４新属８新种）。这是继加拿大北极群岛之后,第二个中志留世放射虫组合的发现,它对研究志留纪古板块的相对位置是很有价值的。     

西藏日土县晚侏罗世放射虫的分类研究

采自西藏西北边陲日土县南的一个燧石标本含丰富的放射虫化石。产此标本的地层主要是一套基性火山岩系,当地称之为“木嘎岗日群”。这个放射虫动物群含15科、32属、54种,其中有本文建立的1个新科(Leugeonidae)、3个新属(Dantze,Leugeo和Levilugeo)及12个新种。该放射虫组合可划归上侏罗统启莫里叽阶(Kimmeridgian)上部或提通阶(Tithonian)下部(即相当于北美 2 alpha亚带至 3 beta亚带;Pessagno et al.,1987h).标志属种如Mirifusus guadalupensis,Tripocyclia jonesi,Hsuum maxwelli等。     

放射虫新属Gansuceratoikiscum化石保存模式和基本构造功能分析北大核心

描述一放射虫新属种Gansuceratoikiscum guanzhuangensis Wang,产于甘肃平凉市附近官庄剖面平凉组底部钙质泥岩中,伴生的牙形类化石属于Pygodus anserinus带,时代被确定为晚奥陶世早期桑比期。讨论放射虫化石的三种保存模式,它们分别代表壳体的幼年、成熟和衰亡三个时期。讨论在角舍虫科中,仅仅根据穴肋对的有无及其数目来建立新种的这一标准的可疑性。最后,对新属种主要骨骼基本构造功能进行初步分析。     

塔斯曼海南部更新世放射虫的生物地层学

本研究利用保存丰富、完好的放射虫对塔斯曼海更新世层序进行地层学分析。对塔斯曼海南部更新世的KH94-4TSP-4PC岩芯的放射虫组合进行了详细的生物地层学分析,并从8 .6 m长的岩芯中识别出83种放射虫。依据放射虫属种的出现和消失,可得到两个放射虫带,即Chi带(老)和Psi带(新)。Chi带的顶部以Saturnalis cir-culariHaeckel ,Cycladophora pliocenicaHays的最后出现和Triceraspyris antarcticaHaecker的首次出现为标志。Psi带的顶部以Stylatractus universusHay和Antarctissa cylindricaPetrushevskaya的最后出现为标志。这些放射虫带可与浮游生物的有孔虫Globorotalia ( G.) truncatulinoides带进行对比。     

放射虫新属Gansuceratoikiscum化石保存模式和基本构造功能分析

描述一放射虫新属种Gansuceratoikiscum guanzhuangensis Wang,产于甘肃平凉市附近官庄剖面平凉组底部钙质泥岩中,伴生的牙形类化石属于Pygodus anserinus带,时代被确定为晚奥陶世早期桑比期。讨论放射虫化石的三种保存模式,它们分别代表壳体的幼年、成熟和衰亡三个时期。讨论在角舍虫科中,仅仅根据穴肋对的有无及其数目来建立新种的这一标准的可疑性。最后,对新属种主要骨骼基本构造功能进行初步分析。     

西藏南部早白垩世瓦兰今期放射虫

放射虫Cecrops septemporatus带在世界各地的瓦兰今阶广泛分布,中国最早在上世纪八、九十年代发现于藏南日喀则地区雅鲁藏布蛇绿岩南侧的下鲁硅岩中。本文对相关样品(80-141)进行再研究,描述放射虫18属23种,包括3个新种。该放射虫组合具有Aurissaturnalis variabilis variabilis(Squinabol),Thanarla elegantissima(Cita),Pantanellium corriganensis Pessagno等重要带化石,可与江孜地区混杂堆积和泽当地区蛇绿混杂岩的硅质岩中发现的相关组合及国际同类放射虫生物带进行比较,为全面认识该时期全球放射虫组合面貌及区域对比提供新的证据。     

江苏仑山地区和湖北宜昌地区上奥陶统五峰组放射虫动物群

本文报道了江苏仑山岗岗山剖面和湖北宜昌黄花场宜黄-1井岩芯中晚奥陶世五峰组灰色、灰黑色硅质页岩和硅质岩中的放射虫动物群。通过对仑山和宜昌五峰组放射虫动物群的再研究,发现该放射虫动物群以空滴虫科(Inaniguttidae)放射虫发育为特点,丰度高,但分异度低、属种单调,仑山地区仅有一科、一属、两种,包括Inani-gutta webbyi和Inanigutta jiangsuensis。宜昌地区同样发现空滴虫科放射虫,但难以鉴定到属种。两个地区的化石整体保存状况较差。根据伴生的笔石化石判断该放射虫动物群时代为凯迪晚期至赫南特早期。动物群特征与凯迪早、中期放射虫动物群有一定差异。同时,在两地五峰组中还新发现一类分类位置待定的锥形疑似放射虫化石,具有一定的地层对比意义。     

中国东北部那丹哈达地体T-J界线地层中的放射虫生物组合

本研究系统描述了中国东北那丹哈达地体中三叠系顶部和侏罗系下部的放射虫动物群及其系统分类,包括5个放射虫生物群,建立了一个新属,10个新种,并报道了121个种级分类单元。通过与加拿大和日本的相关动物群进行比较研究,我们确定了所描述的放射虫生物群的年代归属分别为:晚三叠世诺利(Norian)晚期至瑞替(Rhaetian)早期,辛涅缪尔(Sinemurian)早、中期。     

藏南桑单林剖面晚古新世放射虫动物群及其地质意义

本文描述的放射虫化石新材料发现于藏南桑单林剖面中部灰绿色硅质岩和硅质泥岩层段,共计21属33种,含5个未定种。通过与北大西洋和南太平洋古新世放射虫化石带进行对比,该放射虫动物群可归为晚古新世RP6 Bekoma campechensis带和RP7 Bekoma bidartensis带,时代为Selandian期至Thanetian晚期。综合剖面岩相、构造特征和已报道的放射虫化石组合,本文认为桑单林剖面是一套构造成因的混杂堆积,可能代表了新特提斯洋俯冲和后期印度-欧亚板块碰撞过程中形成的增生杂岩系。区域上,仲巴-萨嘎-江孜一带发现的晚古新世放射虫动物群和海相玄武岩表明,在晚古新世最晚期(大约56 Ma),西藏南部还存在着较大规模的深海沉积。     

西藏丁青蛇绿岩带中一个晚三叠世放射虫动物群

西藏丁青地区晚三叠世Carnian期放射虫动物群共描述19属35种（7个未定种）,归于16科（亚科）中,以Capnuchosphaera,Palaeosaturnalis,Perispongidium,Spongostylus,Annulotriassocampe,Poulpus,Xenorum,Veghicyclia,Tetraporobrachia,Canoptum,Xiphotheca等属为主的这个动物群被命名为Capnuchosphaera triassica组合带,由于Capnuchosphaera属在全世界广泛分布,无论在特提斯生物大区还是环太平洋生物大区,以这个属为主的放射虫动物群已成为国际间Carnian期至Norian早中期放射虫地层学对比的重要依据。     

New radiolarians from the Devonian of the southern Ural Mountains: 2. Middle-Late Devonian

Middle-Late Devonian Radiolarians are recorded for the first time in the southern Ural Mountains in Bashkortostan, in a section of Kariukmas Mountain (Upper Eifelian) and on the southern slope of Argagan Mountain (Middle Frasnian). The new Late Eifelian assemblage is composed of 17 species of 11 genera, and Middle Frasnian radiolarians comprise 13 species of 7 genera of spherical, discoidal, pylomate, and spiny radiolarians. A new species, Primaritripus kariukmasensis, sp. nov., is described. The prevalence of discoidal forms in the oryctocenosis suggests shallow marine conditions in the Late Eifelian and Middle Frasnian basins. Two new biostratons, the Upper Eifelian beds with Primaritripus kariukmasensis and Middle Frasnian beds with Primaritripus chuvashovi, are established based on radiolarians.     

新疆中天山汗吉尕组Helenifore robustum放射虫动物群及其年代地层学意义

汗吉尕组是新疆中天山温泉小区中泥盆统的一个地层单元,为海相碎屑岩夹火山碎屑岩沉积。过去在灰岩团块和灰岩砾石中发现较为丰富的中泥盆世珊瑚和腕足类化石。这次,我们在该组上部地层硅质岩透镜体中首次发现晚泥盆世弗拉晚期的放射虫Helenifore robustum动物群。对于温泉地区该组地层的时代归属,我们认为:由于已发现的中泥盆世珊瑚、腕足类化石主要产于灰岩砾石或外来块体中,因此,这些化石的时代并不代表该组形成的时代;而产于硅质岩透镜体中的晚泥盆世弗拉晚期的放射虫化石很可能代表该组的年代。全文共描述放射虫5属11种,归属3目4科。     

Upper Devonian Radiolarians from the Zeravshan-Gissar Mountainous Area,Uzbekistan

The first finds of Upper Devonian radiolarians in cherty rocks of the Akbasay Formation, Zeravshan-Gissar mountainous area, are reported. Nineteen species of spherical and spiny forms were identified and assigned to 8 genera. Finds of co-occurring conodonts and radiolarians enabled the refinement of the proposed age of radiolarian associations.     

Evolution of Devonian biodiversity of radiolarians with two porous spheres and one main spine

Features and major distinctions in the appearance and distribution of radiolarians with two porous spheres and one main spine in the Devonian basins are considered. Four solitary population waves and expansion scenario of radiolarians of this morphotype have been recognized in the Devonian. A new species, Radiobisphaera rozanovi sp. nov., from the Upper Emsian, Upper Eifelian, and Middle Frasnian of the southern Ural Mountains, from the Upper Eifelian of the Prague Basin (Barrandian), from the Middle-Upper Frasnian of the Rudnyi Altai, and from the Lower Famennian of the Timan-Pechora Basin and the Polar Ural Mountains is described.     

Famennian conodonts from the Hongguleleng Formation at the Bulongguoer stratotype section,western Junggar,Northwest China

The Hongguleleng Formation, the highest and most important Devonian marine carbonate horizon in western Junggar, contains an endemic shallow-water Icriodus–Polygnathus conodont fauna with rare palmatolepids and other genera. The conodont faunas from the Bulongguoer and the Wulankeshun sections are similar, with high abundance (about 40%) of endemic taxa (13 taxa), indicating isolation of the Junggar Basin during early Famennian. Non-endemic species in the faunas suggest that the Lower Member of the Hongguleleng Formation is assignable to the Pa. rhomboidea Zone to the Pa. marginifera marginifera Zone of early Famennian, not including the Frasnian–Famennian boundary. The Upper Member may be of late Famennian–early Tournaisian in age on the basis of our preliminary faunal analysis.     

湖南湘乡上泥盆统佘田桥组介形类

本文首次报道了湖南湘乡上泥盆统佘田桥组介形类化石,共有１８属３５种及未定种,其中包括１１新种。通过与国内外泥盆纪和早石炭世介形类进行比较表明,它们与下伏的中泥盆统棋梓桥组介形类组合和上覆的上泥盆统锡矿山组介形类组合均有明显的差别,该介形类动物群的发现,为佘田桥组的地质时代的确定及地层的划分对比提供了新的古生物依据,并对研究介形类动物群的演化增加了新的资料。     

New data on the Devonian and Carboniferous Graptolithina (Dendroidea) from Belgium with notes on possible occurrences of Rhabdopleuridae in the Belgian Carboniferous

An old find of a graptolite from the Eifelian Jemelle Formation, combined with the recent discovery of an exceptionally well-preserved specimen from the Upper Frasnian (Matagne Formation), allow documentation of the geologically oldest and youngest dendroid fossils from the Devonian of Belgium. Both are ascribed to the long-ranging genus Callograptus (Acanthograptidae). These records enlarge the sparse knowledge of graptolite diversity and occurrences along the southern margin of Laurussia during the mid-Paleozoic. In Belgium, Devonian dendroids are exclusively known from the Dinant Synclinorium. The Devonian dendroid faunas previously reported from the Eifelian, Givetian and Frasnian of the Ardenne–Rhenish massifs (Belgium and Germany) are of low diversity (one to five species per locality). The specimens, generally inedaquatelly preserved, were ascribed to the genera Callograptus, Dictyonema, Palaeodictyota?, and Ruedemannograptus? In these massifs, Carboniferous dendroids are only known from the Viséan (Moliniacian) Denée Konservat-Lagerstätte. Other but undocumented reports of dendroids (and rhabdopleurids) are from the historical type area of the Tournaisian Stage (Tournai area, Brabant Parautochthon). Rhabdopleuridae from the Viséan–Serpukhovian of the Campine Basin (Turnhout borehole) remain incompletely known in the absence of the previously described material.     

滇东北昭通箐门的泥盆纪珊瑚(三)———晚泥盆世早期的四射珊瑚*

云南昭通市东北郊箐门出露了一条比较完整的泥盆纪浅海相地层剖面,下、中、上三个统均有出露,浅海底栖生物化石丰富,研究基础也相对较好,是研究滇东北地区泥盆纪地层的一条理想剖面。由于地层剖面比较长,沉积厚度比较大,此前笔者已经描述了早泥盆世和中泥盆世的四射珊瑚,本文继续描述该剖面的晚泥盆世的地层及其四射珊瑚,讨论它们的地层划分、珊瑚群对比与古生物地理。昭通箐门剖面的上泥盆统主要由白云质灰岩组成,与滇东其它地方的宰格组的岩性基本一致。过去由于宰格组的化石稀少,其地层时代难于确定,因此,昭通箐门宰格组底部珊瑚化石的发现具有重要意义。文中首次描述了箐门放羊冲剖面宰格组底部的四射珊瑚5属7种,包括Disphyllum catenatum,Hexagonaria davidsoni,H.magna,Sinodisphyllum simplex,S.variabile,Temnophyllum poshiense和Truncicarinulum temeniophylloides等,总体显示了晚泥盆世弗拉早期(early Frasnian)的特点。它除了与华南各省的珊瑚群有密切关系外,也与加拿大西部的分子有一定的联系。     

On the status of the Permian radiolarian genus Multisphaera Nazarov and Afanasieva, 2000

Based on the detailed morphological study of the type species of the genus Multisphaera Nazarov and Afanasieva, the author emends the status and diagnosis of this genus and of the subfamily Multisphaerinae Nazarov and Afanasieva. He found that the initial spicule of the type species is not multi-rayed, as initially thought, but a tetrahedral spicule. Accordingly, the genus is assigned to the former tribe Tetrentactiniini Kozur and Mostler that is herein raised to the family rank and comprises all Upper Devonian to lower Permian genera with a tetrahedral initial spicule. Consequently, the subfamily Multisphaerinae is considered a junior synonym of the family Tetrentactiniidae. To better solve the taxonomic problems of this family the author compares the morphological diversity of its members with the morphological diversity of the lower Tithonian (uppermost Jurassic) tetrahedral spicule-bearing entactinarian Radiolaria occurring in the Solnhofen area, southern Germany. Although these genera have the same type of spicule as the Paleozoic ones, they seem to belong to a new family because between the lower Tithonian and the lower Permian genera there is a long time interval of about 120 Ma in which no radiolarians with a tetrahedral initial spicule have been recorded so far. This comparison shows once more the conservative character of the initial spicule and the wide morphological diversity of the extraspicular shell.