贵州西部晚二叠世的䗴类

本文系统描述了贵州西部晚二叠世的(竹蜓)类6属、51种、一亚种和一未定种,其中24新种;建立了两个带和两亚带,自下而上为:1.Codonofusiella 带,2.Palaeofusulina 带,后者包括(1)P.minima-Nankinella guizhouensis 和(2)Palaeofusulina sinensis 两亚带。对Codonofusiella 带的涵意作了进一步阐述,讨论了Palaeofusulina 作为二叠系和三叠系分界标志的重要意义。并扼要介绍了国外晚二叠世含(竹蜓)地层和贵州西部晚二叠世的(竹蜓)类化石带的对比。     

塔里木盆地二叠系孢粉组合及生物地层学*

首次系统地研究了塔里木盆地二叠系孢子花粉，讨论了盆地各地层分区孢粉组合特征，建立了从早二叠世至早三叠世早期的6个孢粉组合带，阐述了各组合带孢粉学特征。依据对盆地二叠纪孢粉植物群组成分子的分析及其与国内外相关孢粉组合的比较研究，将盆地孢粉植物群分为3个发展阶段，即：早二叠世早、中期的欧美型植物群，早二叠世晚期至晚二叠世早期的安加拉欧美混生型植物群和晚二叠世中、晚期的安加拉型植物群。文中还从孢粉地层学角度论述了沙井子组、杜瓦组和普司格组的地质时代以及二叠/三叠系界线等问题。描述孢粉25属33种（含2新种）。     

福建龙岩苏邦栖霞组上部蜓类

本文记叙了福建省龙岩苏邦早二叠世栖霞组上部的类化石,计４属８种,并建立了Ｐｒａｅｓｕｍａｔｒｉｎａｎｅｏｓｃｈｗａｇｅｒｉｎｏｉｄｅｓ－Ｖｅｒｂｅｅｋｉｎａｃｒａｓｓｉｓｐｉｒａ组合带。这些类化石的发现,不但为该地区地层划分与对比提供了新的证据,而且对华南地区早二叠世地层划分有一定意义．     

滇西南耿马弄巴剖面的晚古生代放射虫动物群

滇西南耿马弄巴剖面的硅质岩层中,存在大量放射虫化石,计有12属28种,时代跨越晚古生代,可建立两个组合和三个化石带:晚泥盆世Entactinia-Entactinosphaera组合;早石炭世杜内期中期Albaillellaparadoxa带,杜内期晚期—维宪期早期Albaillellaindensis带,维宪期中期Albaillellacartalla带;晚二叠世Entactiniaitsu-kaichiensis组合。弄巴剖面是由7个主要地层断片组成的断片型地层体,放射虫的研究为地层断片的时代归属问题提供了准确的微体古生物证据。     

山东聊城地区阿城镇煤田二叠纪孢粉组合

对山东聊城阿城镇煤田A19-6、A20-6、L104钻孔岩石样品进行了分析,发现从太原组中上部到上石盒子组地层中均有大量孢粉化石保存,经分析鉴定和统计,共有孢粉化石53个属168种及部分未定种.根据孢粉属种的纵向分布情况及含量的变化,在本区二叠系建立了4个孢粉组合,自上而下为:Ⅳ.Triquitrtites microgranifer-Macrotorispora media组合带;Ⅲ.Limitisporires rhombicorpus -Patellisporites meishanenisis组合带;Ⅱ.Gulisporites cochlearius-Sinulatis porites sinensis组合带;Ⅰ.Thymospora pseudothiessenii-Laevogatisporites vulgaris组合带.通过与邻区及华北部分地区对比,确定本区孢粉组合所在的地质时代应为:太原组中上部,早二叠世早期(组合Ⅰ);山西组,早二叠世中期(组合Ⅱ);下石盒子组,早二叠世晚期(组合Ⅲ);上石盒子组,晚二叠世早期(组合Ⅳ).     

河南荥阳、巩县地区太原组介形类

本文记叙了太原组介形类26属52种(包括13个新种),其中以底栖类型为主,浮游类型少量。根据化石的分布和地层特征,由下而上可划分为两个组合:1.Bairdiacypris yui-Cryptobairdia xiaodonggouensis-Shleesha sullivanensis组合,产于L1—L5灰岩中。2.Rectobairdia subsymmetrica-Orthobairdia xingyangensis-Pustulobairdia subpruniseminata组合,产于L6—L9灰岩中。 按照介形类组合的特征,建议将石炭-二叠系的界线置于L6灰岩之底界。第一组合为晚石炭世,相当于美国的密苏里期—弗吉里期;第二组合归入早二叠世,相当于狼营期。     

论二叠贝类(Permianellids)

本文研究了二叠纪一类形态很特殊的腕足动物——二叠贝类。在仔细观察了迄今所有的有关材料和采用系统切面法和电镜扫描技术分析部分标本后,认为二叠贝类代表着欧姆贝目的1个新支系,即二叠贝科,包括3属,其中1新属(Laterispina gen. nov. )和1新种(Laterispina liaoi gen. et sp. nov. )。根据二叠贝类在地层分布上所显示的形态变化,将二叠贝类的形态演化分成3个阶段:早二叠世、晚二叠世早期和晚二叠世晚期。本文还探讨了二叠贝类的生态特点,认为它属近礁相生物群落中或浅海近浪基面泥质基底上生物群落中的高层附生悬食类,是二叠纪特提斯生物群的特有类群。     

黔桂皖二叠纪末期硅泥质岩相地层中的介形类

对广西柳桥剖面、贵州晒瓦剖面和安徽平顶山西剖面晚二叠世末期硅泥质岩相地层中产出的介形类化石进行了系统分类学研究,共鉴定介形类化石30属86种,其中包括1个新属Denticupachydomella Yuan gen.nov.和2个新种Pseudobythocypris guiqianensis Yuan sp.nov.和Denticupachydomella spinosa Yuan sp.nov..该动物群主要由薄壳和个体较小的介形类组成,呈现出以古生代分子为主,同时含有少量典型中生代先驱分子(如:Abrobairdia,Lobobairdia)的混合动物群面貌.通过这些剖面之间的对比以及与前人研究资料对比,发现各剖面产出的介形类动物群具有强烈的地方性,三个剖面之间无相同分子,亦仅有20种曾报道于欧洲和东南亚等地区晚石炭世-晚二叠世地层.     

福建大田崆峒山晚二叠世和早三叠世介形类

报道福建大田崆峒山晚二叠世大隆组、长兴组及早三叠世溪口组介形类35属67种,其中描述8属9种(包括5新种)。产自长兴组的介形类化石被划分为3个组合,自下而上分别是：Polylites magnituberos-Or-thobairdia meishanensis-Pustulobairdia mailinensis组合,Baitrdia urodelofot-OS-orthobairdia exilimarginata-Bairdia subcontracta组合和Petasobairdia bicornuta-Neoamphissites costatus-Kegelites datianensis组合。大田崆峒山介形类动物群在二叠-三叠系界线上下具有明显的突变性质,这与世界其它地区一样,是遭受二叠纪末期的生物大灭绝事件重创所致。根据介形类化石组合特征,并参考共生或共存化石的内容,福建大田地区长兴组大致相当于浙江煤山长兴组的中、上部,长兴灰岩下伏的海相碎屑岩应划归长兴阶。大隆组、长兴组及溪口组的岩性和化石组合特征．显示古环境从滨海沼泽开始,经历浅海盆地→浅水碳酸盐台地→浅海近岸环境的演化过程。     

福建顺昌地区晚石炭世—早二叠世类生物地层

在对福建顺昌半山石灰岩矿区I号地层剖面中的类化石进行系统鉴定和描述的基础上,根据类化石在地层中的分布和垂向变化规律,自下而上划分为5个带:1)Triticites shikhanensis compactus带,2)Pseudoschwa-gerina galatea带,3)Sphaeroschwagerina sphaerica带,4)Eoparafusulina concisa带和5)Staffella moellerana带。通过与华南沉积区同期类生物地层的对比认为,本区类生物地层应归属于晚石炭世的小独山阶和早二叠世的紫松阶和隆林阶。     

Permian wood from western Henan, China: implications for palaeoclimatological interpretations

Two new species of Araucarioxylon and one new species of Protophyllocladoxylon are described from the Permian of western Henan, China. The stratigraphic position of the fossil woods is discussed in detail, mainly based on the recent findings of animal and plant fossils, and palynomorphs. Interesting is the fact that in North China only the Late Permian wood has growth rings; the specimens from older deposits do not. The presence of growth rings in secondary wood at the close of the Permian shows climatic change, suggesting that aridization most probably took place during that period in the vast area of North China.     

福建永安丰海二叠系上部及三叠系底部的双壳类动物群*

系统研究了闽西永安丰海地区二叠系上部及三叠系下部的双壳类动物群面貌、层位及组合,并与国内外相当的地层进行了对比,阐明了该双壳动物群在二叠-三叠系界线划分中的地层意义.描述了15属24种(其中5新种)、5未定种.     

Middle and Late Permian stratigraphic correlations on the Russian Platform: significance of ostracodes

During the International Peri-Tethys Program, the realization of the maps required efficient correlation tools. During the Late Paleozoic and particularly during the Wordian (Middle Permian), the Russian Platform was under continental and/or marginal paleoenvironmental conditions. This paper draws up the synthesis of the ostracode species recognized in the Middle-Late Permian in this area, from the Barents Sea up to the Precaspian Depression, and shows their importance as a stratigraphic tool for the correlations of continental series.     

Nonmarine ostracodes at the Permian–Triassic boundary of the central part of the East European Platform

Extensive geological and paleontological materials from the upper Permian and the Lower Triassic of the East European Platform had been accumulated by the end of the 20th century. Recently obtained new data indicate the stratigraphic continuity of the East European Permian–Triassic succession. The Permian–Triassic boundary is in many sections associated with the boundary between the Zhukovian and Vokhmian regional stages. New stratigraphic data have led to the revision of the temporal distribution of Zhukovian and Vokhmian ostracodes. In contrast to previous ideas, the rapid development of genus Gerdalia already began in the Zhukovian time rather than in the Vokhmian. At the same time, the first Darwinula of the Triassic type also appeared in the Zhukovian. A proportion of the Permian species were found to cross the boundary between Zhukovian and Vokhmian. The degree of similarity between the Permian and Triassic ostracode assemblages turns out to be much higher than previously recognized.     

Volganelloidea Mandelstam ostracodes from the key section of the terminal Upper Permian strata of the Russian Platform

An abundant and taxonomically diverse ostracode assemblage has been revealed by studying the key section of the terminal Upper Permian strata of the Russian Platform. In addition to taxa already known from this stratigraphic level, the assemblage contains many species of the genera Volganella and Unzhiella (superfamily Volganelloidea), including six previously known and four new species. The outburst of speciation at the final stage of Permian history (prior to extinction) looks unusual and unique.     

西藏改则盆地晚始新世康托组介形类动物群及地质意义

西藏改则盆地新生代陆相康托组地层发育,记录了青藏高原腹地始新世气候变化和隆升历史。本文通过对改则盆地中南部改则县嘎热村康托组剖面进行系统的采样和室内处理,获得363个介形类个体,共鉴定11属27种(包括1个未定种)。通过研究区介形类动物群的特征分子Heterocypris igneus及与东濮、渤海、华北、江汉等地区介形类动物群对比研究,认为康托组上部的沉积时代应为晚始新世。本文首次报道了改则盆地康托组的介形类动物群面貌,据介形类组合厘定了康托组沉积时代,为研究青藏高原腹地新生代地层提供了基础资料。     

NEW MATERIAL OF SINOHELICOPRION FROM CHANGXING, ZHEJIANG PROVINCE

Thenewmateria1describedinthispaperisarowofcontinual1lteethandgentlyarciform,itslengthmeasuresaboutl2Omm-Thevariationsinsizeoftheteetharesomewhatirregularffomendtoend.Atoothmayberegardedasconsi-stingofthreeparts:acuttingblade,alatera1part(wing)andabase.Thereisnointerdenticalspacebetweenadjacentteeth.Thecuttingbladeistriangu1arinlateralview,itformsabouthalfofthetota1lengthofthetooth-Therearemanydenticlesonitsanteriorandposterioredges,whicharel8averagelyinnumberoneachside.Thetopsofthedenticlesa…     

A second varanopseid skull from the Upper Permian of South Africa: implications for Late Permian ''pelycosaur'' evolution

Late Permian terrestrial faunas of South Africa and Russia are dominated taxonomically and ecologically by therapsid synapsids. On the basis of a single specimen from the Upper Permian of South Africa, the varanopseid Elliotsmithia longiceps is the sole basal synapsid ('pelycosaur') known from Gondwana. Recent fieldwork in the Upper Permian of South Africa has produced a second varanopseid specimen that is referrable to Elliotsmithia . Data from both this specimen and the holotype suggest that Elliotsmithia forms a clade with Mycterosaurus from the Lower Permian of North America and Mesenosaurus from the Upper Permian of Eastern Europe. That postulate is supported by the three most parsimonious trees discovered in a new analysis of varanopseid phylogeny. However, the available data cannot resolve the interrelationships of these three genera. The new phylogenetic results contrast with earlier work identifying Elliotsmithia as the basal member of a clade that includes the North American taxa Aerosaurus , Varanops , and Varanodon . The new trees reduce the stratigraphic debt required by the latter scenario, and the one with the least stratigraphic debt identifies Elliotsmithia and Mesenosaurus as sister taxa. Two new taxa are erected, Mycterosaurinae and Varanodontinae, for the two varanopseid subclades.     

长江源区晚三叠世伟齿蛤科(双壳类)一新属--Quemocuomegalodon

记述青海唐古拉山北坡雀莫错附近晚三叠世甲丕拉组灰岩中的一类铰齿构造特殊的伟齿蛤类化石,建立新属Quemocuomegalodon gen．nov．及Q．orientus gen．et sp．nov．和Q．longitatus gen．et sp．nov.2新种,并简述伟齿蛤类的生活习性。     

Ichnostratigraphic correlation of Lower Palaeozoic clastics in the Kufra Basin (SE Libya)

The Lower Palaeozoic deposits in North Africa are dominated by sandstones and shales which often lack biostratigraphically useful body fossils. Trilobite burrows ( Cruziana ) partly fill this gap and provide the basis for medium-resolution stratigraphic interpretations. Several Ordovician-Silurian ichnostratigraphically significant Cruziana forms have been found and studied in the Kufra Basin (SE Libya), including C. goldfussi and C. furcifera from the Lower Ordovician Hawaz Fm. and a new ichnospecies, C. kufraensis , occurring in transgressive sandstones at the base of the Lower Silurian Tanezzuft Fm. The upper Tanezzuft Fm. and Akakus Fm. typically contain C. acacensis , a form that is characteristic of the Lower Silurian of Northern Gondwana.