内蒙古巴特敖包地区早泥盆世牙形刺

内蒙古达茂旗(达尔罕茂明安联合旗)巴特敖包地区以碳酸岩相古生代地层发育而引人注意。经多年研究,特别是李文国等(1985)的研究,使本区珊瑚、腕足类、层孔虫、鹦鹉螺等大化石的研究工作已有一定基础,并依据牙形刺首先确定了在阿鲁共剖面有泥盆纪地层的存在。但本区泥盆纪地层仍存在很多问题,必须通过对牙形刺的研究加以解决。在王成源研究员的精心安排和亲自指导下,作者等在巴特敖包地区的七个剖面进行了系统取样研究。经对158个样品(重667kg)的分析,在本区发现了大量的原定为志留纪的早泥盆世地层,包括西别河组命名剖面。分析结果同时证明,本区不存在志留系温洛克统的沉积。巴特敖包剖面断层发育,志留—泥盆纪地层交替出现,巴特敖包组应取消,原定的阿鲁共剖面层序颠倒。本区地层应厘订为志留系的西别河组(罗德洛统—普里道利统)和下泥盆统的阿鲁共组(Lochkovian阶),前者以包尔汉图剖面为标准剖面,后者应寻找更好的标准剖面。本文重点总结巴特敖包地区早泥盆世的牙形刺。本区共建立了4个牙形刺带,文中共描述了8牙形刺属,21种,其中包括4亚种、1新种(Belodellataeniocuspidatasp.nov.)和1未定种。     

广西桂林泥盆纪牙形刺组合序列与海平面变化

本文以桂林灵川岩山圩中,晚泥盆世界线剖面,桂林沙河能源疗养院背后信都组－唐家湾组剖面及桂林额头村Ｄ／Ｃ界线剖面的牙形刺资料为基础,结合前人在桂林地区所做的牙形刺生物地层工作,识别出该区中,晚泥盆世牙形刺化石的１６个组合序列,并以此为尺度结合层序地层格架,层序界面及层序中的微相叠加形式,讨论该区中,晚泥盆世高分辨的海平面变化。     

滇西北石炭系和二叠系牙形刺序列

本文论述了云南西北部宁蒗县石炭系、二叠系尖山营剖面的牙形刺研究成果。共划分出17牙形刺带。由于采样系统,牙形刺序列连续,而且与国内外的牙形刺带可以对比,为本区生物地层的研究提供了可靠的古生物学基础。尖山营剖面牙形刺众多,同时含有丰富的珊瑚、腕足类,(竹蜓)类、菊石等化石,是研究不同化石门类生物地层对比的理想剖面;此剖面的进一步工作,将为不同相区地层对比提供更为可贵的资料。值得注意的是,本区石炭系、二叠系的界线,尚待深入研究,二叠系的底界很可能     

广西南宁大沙田下泥盆统那高岭组的牙形刺

世界泥盆系洛霍考夫阶和布拉格阶牙形刺生物地层有较明显的地理分区性,区域对比较困难,中国缺少连续的布拉格阶与洛霍考夫阶灰岩相剖面,牙形刺生物地层的研究,仍很不完善。广西南宁大沙田剖面是目前所知布拉格阶灰岩最多的剖面,在其下部发现了牙形刺Eognathodus irregularis,E.nagaolingensis,E.sulcatus mu morphs,Masaraella pandora(Murphy,Matti et Walliser,1981)W morphotype P element,其时代为布拉格期早期,大致相当于北美的Eognathodus irregularis-Gondwania profunda带和欧洲的E.sulcatus带。中布拉格期牙形刺Pseudogondwania kindlei带,还没有确立。晚布拉格期的牙形刺Polygnathus pirenniae带的存在和时限范围也没有在大沙田剖面得到确定。但大沙田剖面那高岭组的时代属布拉格期早期是肯定的。     

贵州紫云陆棚相区石炭纪二叠纪牙形刺生物地层

本文概述了贵州紫云陆棚相区羊场剖面上石炭统一二叠系地层(本文引用了二叠系三分方案)和牙形刺的11个组合序列。并描述了3未定名新种、4未定种。该剖面牙形刺序列较为完整,可与国内外有关地区同时代地层和牙形刺序列相比较,从而对该地区上石炭统一二叠系的重新划分和对比提供了依据。该剖面除(竹蜓)、牙形刺、珊瑚外,还采到了广海浮游的菊石,这对剖面的划分更为重要。     

南秦岭略阳地区略阳组牙形刺新材料及其时代意义

略阳组分布于南秦岭勉略缝合带附近,是略阳地区重要的岩石地层单元。本次研究在略阳灵岩寺南部剖面的略阳组获得牙形刺13枚,共识别出3属5种,包含2亚种和2未定种,分别为:Siphonodella homosimplex,Polygnathus communis communis,Po.inornatus inornatus,Po. sp.和Pseudopolygnathus sp.。该牙形刺组合可以与华南同时期牙形刺进行对比,时代为早石炭世杜内期早期,这为确定略阳组的下部层位的具体时代提供了新的牙形刺证据。略阳组中所产出的Si.homosimplex为华南地区浅水相牙形刺的典型代表,Po.inornatus inornatus广泛见于西欧的浅水相地层,这表明在早石炭世期间勉略地区为浅水碳酸盐岩台地沉积环境,且与华南地区生物区系存在紧密联系,同前人根据底栖生物化石研究得出的结论相一致。     

云南曲靖上志留统牙形刺

云南曲靖地区志留纪地层出露完好,层序清晰,化石丰富,是我国志留纪地层的重要标准剖面之一。该区地层,经多次的研究,早已搞清了地层层序,但在时代划分和对比上,至今仍未统一。我所志留纪地层队沿用了丁文江、王曰伦(1936、1937)对本区的地层的命名,自下而上为关底组、妙高组和玉龙寺组。研究材料是我国志留纪牙形刺的首次报道。自Walliser(1964)对欧洲卡尼克阿尔卑斯地区志留纪牙形刺的系统研究之后,牙形刺在志留纪地层划分和对比上的标准性,就仅次于笔石。     

湖北宜昌真金和陈家河奥陶系牯牛潭组至宝塔组的牙形刺及其地层意义

根据采自湖北宜昌分乡陈家河和远安真金两剖面奥陶系牯牛潭组至宝塔组的牙形刺,将该段地层的牙形刺生物带自上而下综合划分为Hamarodus brevirameus,Amorphognathus superbus,Baltoniodus alobatus,Pygodus anserinus-Yangtzeplacognathus jianyeensis,Yangtzeplacognathus protoramosus,Yangtzeplacognathus foliaceus,Histiodella kristinae-Eoplacognathus suecicus,Dzikodus tablepointensis,Lenodus variabilis和Lenodus antivariabilis等牙形刺生物带。其中宝塔组之Hamarodus brevirameus,Amorphognathus superbus生物带及Baltoniodus alobatus生物带顶部归为凯迪阶(Katian),庙坡组Baltoniodus alobatus生物带大部和Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带中上部归为桑比阶(Sandbian),而牯牛潭组的Yangtzeplacognathus protoramosus至Lenodus antivariabilis等牙形刺生物带和庙坡组Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带下部则归入达瑞威尔阶(Darriwillian)。这一牙形刺带序列与宜昌黄花场和分乡剖面的牙形刺生物带相一致。     

贵州罗甸县罗悃剖面石炭系巴什基尔阶-莫斯科阶界线研究北大核心CSCD

贵州罗甸县等地发育宾夕法尼亚亚系巴什基尔阶—莫斯科阶的斜坡相沉积地层,含丰富的■类和牙形刺化石。作为莫斯科阶底界重要生物地层标志的牙形刺Streptognathodus expansus,Idiognathoides postsulcatus以及■类化石Profusulinella (Aljutovella) aljutovica,Pro.prisca和Eofusulina在该剖面上均有发现。通过对罗悃剖面宾夕法尼亚亚系巴什基尔阶-莫斯科阶界线附近■类以及牙形刺分布情况的研究,本文采用Idiognathoides postsulcatus的首现(116.8m)作为罗悃剖面莫斯科阶底界的生物地层标志,■类Profusulinella prisca和Pro.aljutovica最早出现的层位与之相近,可以作为界线的辅助标志。     

渝东南地区泥盆纪牙形刺及其地层意义

本文研究了渝东南地区3个泥盆纪剖面的牙形刺,黔江濯水剖面的顶部(第7层)产有Palmatolepis quadrantinodosalobata等牙形刺,时代为法门期早期Middle crepida带至Lower rhomboidea带,是本区泥盆纪海相沉积的最高层位;酉阳兴隆剖面(第51层)发现牙形刺Palmatolepis semichatovae等牙形刺,时代为弗拉斯期晚期Lower rhenana带;濯水剖面的5层和6层、黔江水泥厂剖面的5层至7层以及酉阳兴隆剖面的52层和53层均产有较多的弗拉斯期晚期的牙形刺。本区写经寺组、黄家磴组和云台观组都可能是穿时的,写经寺组在各剖面残留厚度不同。写经寺组的时代为弗拉斯期晚期至法门期早期。本区缺少法门期中、晚期的典型的海相沉积。描述了一个新种Polygnathus chongqingensis Wang sp.nov.。     

内蒙古达茂旗巴特敖包地区包尔汉图剖面牙形刺生物地层

内蒙古达茂旗(达尔罕茂明安联合旗)巴特敖包地区志留纪、泥盆纪碳酸岩相地层发育,本区珊瑚、腕足类、层孔虫等底栖大化石的研究工作已有一定基础。但志留纪、泥盆纪地层在时代确定和对比上还存在很多问题,必须用主导化石门类牙形刺加以解决。研究表明：包尔汉图剖面的顶部属泥盆系无疑,应归入阿鲁共组,而不是西别河组;巴特敖包地区的海侵,始于罗德洛统卢德福德阶(Ludfordian)早期。本剖面没有发现文洛克世和罗德洛世早期的海相沉积。本文描写了一个志留纪牙形刺新种：Ozarkodina uncrispa sp．nov．。     

Conodont biostratigraphy and carbon isotope chemostratigraphy of the Middle to Upper Ordovician on the western Yangtze Platform,South China

Middle and Late Ordovician strata in the nearshore area of the western Yangtze Platform are investigated. In total, 241 δ¹³C_carb samples and 108 conodont samples from the Songliang and Tuanjie sections in the northeastern Yunnan Province were collected for chemostratigraphic and biostratigraphic studies. Altogether, 21 species belonging to 16 conodont genera were recovered from the two sections, among which Ansella jemtlandica, Drepanoistodus basiovalis, Hamarodus brevirameus, and Microzarkodina hagetiana are important age indicators within the Dapingian to early Katian interval. Four carbon isotope shifts are recognized in the studied sections: a negative shift in the early Darriwilian, the middle Darriwilian carbon isotope excursion (MDICE), the early Katian Guttenberg carbon isotope excursion (GICE), and a further positive carbon isotope shift later in the early Katian which is a new record of this event in South China. Integrated carbon chemostratigraphy and conodont biostratigraphy indicate early Darriwilian and early Katian ages for the base and top, respectively, of the Huadan Formation at the Songliang section, and a Darriwilian to early Katian age for the Shihtzupu Formation at the Tuanjie section.     

湖北宜昌远安真金和界岭奥陶系牯牛潭组顶部的牙形刺及其地层意义（英文）

本文描述了采自湖北宜昌远安真金和界岭剖面奥陶系牯牛潭组顶部的牙形刺,它们有Baltoniodus prevariabilis,Drepanoistodus venustus,Panderodus gracilis,Periodon aculeatus,Protopanderodus calceatus,P.varicostatus?,Yangtzeplacognathus foliaceus和Y.protoramosus等,确认宜昌地区牯牛潭组顶部应归属于奥陶系达瑞威尔阶Pygodus serra带之Yangtzeplacognathus protoramosus亚带,并可与宜昌黄花场剖面和南京汤山外杆沟剖面同名组顶部及新疆柯坪羊吉坎剖面一间房组顶部的牙形刺带相对比。同时,它要比重庆城口大槽剖面牯牛潭组顶部的牙形刺带低3个带(Pygodus anserinus带至Baltoniodus variabilis带),这一事实也说明了牯牛潭组顶部在中国扬子地台的穿时性。     

辽河断陷东部凹陷钻井中含牙形石的中奥陶统马家沟组

钻探证实辽河断陷东部凹陷内,中、新生代地层之下发育厚层质纯的碳酸盐岩,是潜山油气勘探的主要目的层。经过系统选样,发现了较为丰富的牙形石化石。牙形石研究表明这套厚层质纯的碳酸盐岩地层属于中奥陶统的马家沟组,含有上部以Erraticodon tangshanensis为主,下部以Tangshanodus tangshanensis为特征的牙形石。研究还首次表明辽东太子河早古生代海盆已延伸到辽河断陷东部凹陷内部。由于这套碳酸盐岩地层具有良好的油气储集性能,因此,此研究成果对于在东部凹陷内部进一步寻找"新生古储"式潜山油气藏具有重要的指导意义。     

Restudy of some Ordovician–Silurian boundary graptolites from Anticosti Island, Canada, and their biostratigraphic significance

The Ellis Bay Formation on Anticosti Island has long been recognized for the biostratigraphic importance of its latest Ordovician conodont, palynomorph, and shelly fossil assemblages. However, a sparse record of graptolites has made it difficult to correlate these assemblages with the graptolite biozonation. Restudy of some previously described and examination of newly collected normalograptid specimens from the Ellis Bay and lower Becscie formations, however, shows that biostratigraphically important taxa are present and these species provide important constraints on the age of the strata. Normalograptus parvulus and N. minor have been identified in the upper half of the Ellis Bay Formation, suggesting that these strata are late Hirnantian in age ( N. persculptus Biozone). Normalograptus imperfectus and Normalograptus sp. aff. N. acceptus occur in the basal beds of the Becscie Formation, indicating that these strata are earliest Silurian. These graptolite data support the hypothesis that the positive carbon isotope excursion seen in the uppermost strata of the Ellis Bay Formation is isochronous with that seen in the Hirnantian strata at Dob's Linn, Scotland, and does not span much of the lower to mid-Hirnantian, as is the case in Arctic Canada and Nevada, USA.     Anticosti Island , Hirnantian, graptolites, Ordovician, Silurian.     

Integrated biostratigraphy and carbon isotopes from the Cambrian Tangwangzhai section,North China

The Tangwangzhai section, western Shandong Province, North China, the type section for the Cambrian Kushan and Chaomitian formations, yielded a diverse and relatively well-preserved conodont fauna, in which we recognize the Westergaardodina orygma, Westergaardodina matsushitai, Muellerodus? erectus, and Westergaardodina aff. fossa–Prooneotodus rotundatus zones of the North China conodont zonation. The Tangwangzhai conodont succession can be correlated not only with the polymerid trilobites occurring in the section but also with the conodont zones established for South China. The first occurrence of Furnishina longibasis and Furnishina quadrata in the upper part of the Westergaardodina matsushitai Zone allows the recognition of the base of the Paibian Stage and Furongian Series in the upper part of the Kushan Formation. The base of the Jiangshanian Stage, in the uppermost Muellerodus? erectus Zone, can be recognized by the presence of Westergaardodina cf. calix close to the base of the Chaomitian Formation. Chemostratigraphic analyses of the Tangwangzhai section show the onset of a positive carbon isotope excursion, referred to the SPICE event, in the upper part of the Kushan Formation at a level corresponding to the first occurrence of F. longibasis and F. quadrata. The base of the Jiangshanian Stage in the section is close to the demise of the SPICE positive excursion.     

Conodonts from the Permian Jisu Honguer (Zhesi) Formation of Inner Mongolia, China

The Jisu Honguer Formation (“Zhesi Formation”) is a North China marine carbonate unit of Permian age containing a mixed fauna of Tethyan, Boreal and endemic elements. The age of the Jisu Honguer Formation has been thought to range from Artinskian to Kazanian based on previous studies using mostly benthic macrofossils. A typical Mesogondolella aserrata conodont fauna is reported from the lower part of the upper member of the Jisu Honguer Formation in the Ulanqub District, Zhesi area, of northern China. The fauna indicates a Middle Permian (Guadalupian) age, most likely late Wordian to early Capitanian, for the strata yielding conodonts. The whole Jisu Honguer Formation could be assigned to the Wordian to early Capitanian age. The overlying Yihewusu Formation is probably of Capitanian age. There are no Wuchiapingian marine deposits in the Zhesi area. As characteristic of the open sea Guadalupian conodont faunas of the Tethys, smooth Mesogondolella dominate the fauna. The view that all Tethyan Guadalupian conodont faunas consist exclusively of serrated Mesogondolella cannot be confirmed. Three new species are described: Mesogondolella neoprolongata C. - y. Wang, Mesogondolella mandulaensis C. - y. Wang and Wardlawella jisuensis C. - y. Wang.     

First documentation of Llandovery (Silurian) conodont genus Astropentagnathus in China (Langao,Shaanxi Province) and the age of Baiyaya Formation

Age of the Baiyaya Formation in the Ziyang-Langao region of Shaanxi Province remains debatable. Ten samples were taken for conodont biostratigraphical studies from the Tianwancun section. The first discovery of Astropentagnathus in China indicates that the genus has a wider geographical distribution than previously known. Conodont fauna from the Baiyaya Formation suggests that the lower part of the unit corresponds to the Pterospathodus eopennatus Superbiozone, and its upper part to the lower Wenlock (probably mainly to the Kockelella ranuliformis Superbiozone). Diachroneity of the Baiyaya Formation in the region is confirmed by conodont studies from the Tianwancun and Qiaoxi sections. Further studies are required to find out age-variation of the formation more precisely.     

鄂西地区中二叠世鱼类微体化石新材料

本文首次报道产自鄂西宜昌大天坑茅口组中的几种软骨鱼类的鱼鳞化石和硬骨鱼类(葆青鱼和古鳕鱼)鱼牙化石,这些鱼类微体化石与牙形刺Mesogondolella aserrata,Hindeodus minutus,Ellisonia teicherli,Xaniog-nathus elongatus等共生,表明其所在地层的时代为中二叠世。     

重庆石柱漆辽地区中、上奥陶统牙形刺序列—揭示达瑞威尔阶下部至桑比阶之间的沉积间断

本文详细描述了重庆石柱漆辽剖面奥陶系达瑞威尔阶(Darriwilian)牯牛潭组至凯迪阶(Katian)宝塔组的牙形刺序列及其对比。牙形刺序列由上而下可分为:宝塔组Hamarodus brevirameus生物带和Amorphognathus superbus生物带;大田坝组的Baltoniodus alobatus,Baltoniodus variabilis和Yangtzeplacognathus jianyeensis生物带;牯牛潭组的Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带。其中Hamarodus brevirameus生物带至Baltoniodus alobatus生物带上部为凯迪阶,B.alobatus生物带下部至Yangtzeplacognathus jianyeensis生物带上部为桑比阶(Sandbian),而Yangtzeplacognathus jianyeensis生物带下部,Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带归入达瑞威尔阶。根据文中所识别的牙形刺序列,该剖面显然缺失了达瑞威尔阶中上部的牙形刺生物带如Pygodus serra生物带(即Yangtzeplacognathus protoramosus和Y.foliaceus生物带),Eoplacognathus suecicus和Dzikodus tablepointensis生物带。因此,在重庆石柱漆辽剖面奥陶系牯牛潭组和大田坝组之间的地层是不连续的,存在一明显的沉积间断,缺失了相当于牯牛潭组标准剖面中上部的地层(达瑞威尔阶中上部)。而这一沉积间断所发生的时间正好与达瑞威尔中晚期全球海平面下降相吻合。