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1.
海相早石炭世地层,在我国西南和西北地区分布广泛,发育完全,但以腕足-珊瑚相居多,菊石相还只见零星报道。最近新疆区域地质调查队在东、西准噶尔和北天山等地,均发现了以含菊石化石为特征的石炭纪地层。本文所描述的材料,是由新疆地层表、古生物图册编制小组,新疆工学院及中国地质科学院地质研究所三室上古生代组,共同于1977 相似文献
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通过总结福建省石炭纪─白垩纪地层中及珊瑚、腕足、双壳、菊石、叶肢介和植物等门类的古生物化石组合特征,为省内石炭纪─白垩纪地层的划分、对比提供重要的依据。 相似文献
3.
通过总结福建省石炭纪－白垩纪地层中Ｔｉｎｇ及珊瑚、腕足、双壳、菊石、叶肢介和植物等门类的古生物化石组合特征,为省内石炭纪－白垩纪地层的划分、对比提供重要的依据。 相似文献
4.
新疆寒武纪三叶虫动物群可分为三个生物地理区:1.天山型动物群——博罗科努山区;2.华北型动物群——柯坪区;3.过渡型(库鲁克塔格型)动物群——库鲁克塔格区.库鲁克塔格寒武纪三叶虫动物群序列自下而上可分出13个化石带:下寒武统西大山组2个带;中寒武统莫合尔山组4个带;上寒武统突尔沙克塔格组7个带. 相似文献
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《西北地质》2015,(3)
区内早泥盆世沉积为卓木巴斯套组,产丰富的古生物化石,以极为丰富的腕足为主要特征。通过地质路线调查与剖面测量,采集到大量的腕足、珊瑚、三叶虫、苔藓虫、角石、菊石等动物化石,其中,腕足类占90%以上。本次工作鉴定出腕足化石24属48种。根据动物化石组成及面貌将其定为"东准Spinatrypa khalfini动物群"。主要特征是腕足在动物群中的含量占绝对比例,而且石燕类、无洞贝类占绝对优势。依据化石组合类型及产出层位将其划分为下部Leptocoelia sinica组合及上部Spinatrypa khalfini组合。将北塔山地区与我国北部其他地区同时代地层中的腕足动物群进行对比发现:北塔山地区的腕足化石的产出层位与内蒙古地区东乌珠穆沁旗敖包亭浑迪组、东北地区金水组、霍龙门组、黑台组、乌努尔组大致相当;并根据个别属种在世界范围的时代意义,确定了卓木巴斯套组的时代为埃姆斯期。 相似文献
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中国丰宁统(下石炭统)腕足动物的地层和地理分布 总被引：3，自引：0，他引：3
中国南方(贵州、湖南)丰宁统的腕足动物化石曾经丁文江、葛利普(A.W.Grabau)(1931—1933)和田奇(璀乃)(1934,1946)系统研究过,可惜其著作未曾发表。近年来对中国各地石炭纪腕足动物化石的系统采集和描述,已经累积了不少资料,证明中国丰宁统腕足动物至少可以区分三个不同的生物地理区系:华南区、北方区和喜马拉雅区。本文主要对以上三个区系的腕足动物化石分布特征,三个区系之间的相互发展关系,以及各区系腕足动物群组合序列进行探讨。 相似文献
8.
西藏北部申扎地区德日昂玛-下拉山石炭二叠系生物地层划分 总被引：4，自引：0，他引：4
吉林地质调查院在西藏北部申扎地区进行地质调查时，对石炭纪一二叠纪地层进行了详细研究，自下而上划分为永珠组、拉嘎组、昂杰组、下拉组和木纠错组，并进行了生物地层划分，在永珠组建立了Gnathodus girtyi-Gnathodus tezanus牙形刺组合、Goniatites菊石带、Choristites-Spirigerella腕足组合和Trigonatreta cf．paucicostulata-Elivella baschkirica腕足组合；昂杰组建立了Spiriferella-Costiferina腕足组合；下拉组建立了Ipciphyllure-Waagenophyllum-Wentzelellites珊瑚组合、Dielasma millepunctatum-psudoantiquatonia mutabilis腕足组合和Neoschwagerina筵带。 相似文献
9.
新疆库鲁克塔格地区的砂石山剖面是南天山上泥盆统出露较为完整、化石最为丰富的剖面,也是砂石山组的层型剖面。对此剖面地层及腕足动物群的研究表明,砂石山组的时代应是中法门期,破城子组和砂石山组很可能是上下关系,故砂石山组不应被废弃。砂石山组的沉积环境与华南锡矿山组和准噶尔地区洪古勒楞组的沉积环境相似,但腕足动物群与前者相似,属同一生物地理区,而与后者差别较大,属不同的生物地理区。 相似文献
10.
新疆东昆仑山阿其克库勒地区下二叠统下部碧云山组,上部喀尔瓦组,两组均含珊瑚、(竹蜓)及腕足化石.对其中的四射珊瑚化石进行了描述.研究结果,该区早二叠世的珊瑚动物群属暖水型的Iranophyllum动物群.推测碧云山组相当栖霞组,喀尔瓦组相当茅口组. 相似文献
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首次在新疆准噶尔盆地西北缘和什托洛盖以北地区的晚泥盆世法门晚期地层中发现板海神石及大型弓海神石菊石动物。板海神石动物群由Platyclymenia （Pl.） subnautilina （Sandberger）、Sporadoceras sp.和Prionoceras frechi （Wedekind）等分子组成;可能与Annulata事件有关。弓海神石动物群中Protactoclymenia sp.和Cyrtoclymeniasp.以壳体硕大为显著特征,直径可达20cm。这些菊石可与西欧晚泥盆世标准菊石带第Ⅳ带的菊石组合进行对比（相当于牙形石Upper trachytera至Lower expansa带）,而且在区域上的分布具有一定的稳定性,尤其是弓海神石动物群,其产出层位可作为和什托洛盖以北地区地层对比的标志层。 相似文献
13.
冈瓦纳与欧亚大陆间的昌都地块构造属性存在争议,解决问题的关键是生物古地理区系判别.青海南部二叠纪类化
石群的研究表明昌都地块该生物群一直表现为暖水的特提斯型,与华南地区始终表现出更多的相似性,其生物古地理归属应
为特提斯大区华夏-特提斯区华南亚区.昌都地块南界龙木错-双湖-澜沧江缝合带在早二叠世为划分青藏高原暖水型特提
斯区的南界,不仅是华南亚区与藏北冷暖混合亚区的分界线,也是特提斯大区与冈瓦纳大区的分界线.中二叠世以后该带不再
构成大区界线,但在确定次一级分区界线上仍是一个很好的划分标志;北界金沙江缝合带二叠纪两侧生物群表现出一致性,
未形成浅海底栖生物自由迁移的障碍,不具有生物古地理分区意义. 相似文献
14.
The identification and correlation of the Carboniferous-Permian (Gzhelian-Asselian) boundary within the sedimentary sequences of Gondwana has always been a topic of debate. Type latest Carboniferous and earliest Permian marine sequences are characterised by warm tropical faunas and come from the Uralian Region of Russia and Kazakhstan. Faunas include conodonts and fusulinid foraminiferids which are prime tools for correlation. Such faunal groups are absent from most Gondwanan sequences where reliance for correlations must be placed primarily on brachiopods, bivalve molluscs and palynology. The Western Australian marine sequences, with their contained ammonoids, provide a pivotal link for the dating and correlating of Early Permian Gondwanan sequences with those of the type regions and their palynostratigraphical record is essential for trans-Australian correlations and correlations elsewhere throughout Gondwanaland.New data from the fully cored DM Tangorin DDHl bore hole, drilled in the Cranky Corner Basin, New South Wales, Australia, reveals a sequence of descending faunal zones. The stratigraphically highest zone with Eurydesrna cordaturn, encompasses the Late Sakmarian (Sterlitamakian). The middle zone with Torniopsis elongata, Sulciplica c r a m and Trigonotreta tangorini straddles the Sterlitamakian-Tastubian boundary, with the palynomorphs Pseudoreticulatispora pseudoreticulata high in the zone and Granulatisporites confluens low in the zone. An impoverished fauna with Trigonotreta nov., low in the Granulatisporites confluens Zone, is probably of latest Asselian or Tastubian age.Significant new data from Argentina has revealed marine faunas from below the occurrence of Granulatisporites confluens. These are considered to be of Asselian age. Outcrops of the Tupe Formation, with a marine fauna, at La Herradura Creek in the western Paganzo Basin, San Juan Province, are best regarded as being of mid to late Asselian age. The Tupe Fauna has been recognised as the Tivertonia jachalensis-Streptorhynchus inaequiornatus Zone. Previously, this fauna was considered to be of Late Carboniferous or Stephanian age. Three faunal associations are known from the Rio del Peii6n Formation, Rio Blanco Basin, La Rioja Province. The middle assemblage with Tivertonia, Costaturnulus, Kochiproductus and Trigonotreta, appears to correlate well with the Tupe Formation fauna. The lower assemblage, with Streptorhynchus, Etherilosia, Costaturnulus, Trigonotreta and a punctate spiriferid, as well as indeterminate productids, probably of Early Asselian age. The youngest assemblage includes a species ofRhynchopora that is close to Rhynchopora australasica from the latest Asselian-early Tastubian of Western Australia. The marine biostratigraphical data from Argentina has enabled a much greater understanding of the earliest Permian marine faunas to be achieved - a story that is apparently absent from the other cold and cool temperate regions of Gondwana. 相似文献
15.
A. G. Konstantinov 《Stratigraphy and Geological Correlation》2008,16(5):490-502
The history of Triassic ammonoids in the Siberian Province of the Boreal Paleobiogeographic Realm is recorded in detail in sections of Northeast Asia. In this region there are known at present 123 Triassic ammonoid genera of 41 family and 3 orders. Six stages and 14 substages are defined based on main levels of taxonomic restructuring of Triassic ammonoids, changes in their genera and families diversity, and changes in percentage of endemic and cosmopolitan taxa in assemblages. Each stage and substage is characterized by individual taxonomic composition of ammonoids, dominant groups, trends of changes in taxonomic diversity, and percentages of endemic and cosmopolitan taxa. Boundaries of ammonoid evolution stages coincide as a rule with boundaries of series and stages, whereas boundaries of evolutionary substages match those of substages. In the history of Triassic ammonoids of Northeast Asia, the periods of a rather monotonous fauna represented mainly by cosmopolitan or panboreal taxa (early Induan, early Olenekian, early Anisian, late Anisian, early Carnian, early and middle Norian) alternated with periods, typical of which were higher rates of taxa origination and endemism of ammonoids (late Induan, late Olenekian, middle Anisian, Ladinian, late Carnian). Changing degree of cosmopolitism and endemism of Triassic ammonoid faunas from Northeast Asia is shown to be connected with global eustatic sea-level fluctuations and climatic changes. 相似文献
16.
A. G. Konstantinov 《Stratigraphy and Geological Correlation》2014,22(2):190-201
The stratigraphic distribution of ammonoids was analyzed in the Daxatina canadensis Subzone of the Trachyceras Zone distinguished in the Dolomites of Italy. It was established that ammonoids of the Daxatina and Trachyceras genera are confined to the lower and upper parts of the canadensis Subzone in the Stuores-Wiesen section, which was suggested as a global stratigraphic section of the lower boundary of the Carnian Stage. Owing to discreteness of the ammonoid complex and absence of the Trachyceras genus, the lower part of the canadensis Subzone was excluded from the Trachyceras generic zone and is considered as the independent Daxatina canadensis Zone, which overlies the Frankites regoledanus Zone. On the basis of the principle of priority and similar ammonoids of the canadensis and regoledanus zones, the lower boundary of the Carnian Stage was accepted in the basement of the Alpine Trachyceras aon Zone and coincides with appearance of the Trachyceras genus. The main problems of the Boreal-Tethyan correlation of the Lower Carnian and adjacent stratigraphic levels are reviewed. The composition and distribution of the Lower Carnian ammonoids of northeastern Asia are specified taking into account the results of the revision of the Early Carnian trachyceratids of this region. Being the traditional biomarkers of the basal beds of the Carnian Stage in the Tethys, the ammonoids of the Trachyceras genus, which were unknown before in the Boreal Realm, were identified for the first time in the Lower Carnian of northeastern Asia. The Lower Carnian rocks of northeastern Asia, British Columbia, and the Alps were zonally correlated and the Lower Carnian boundaries were substantiated in the Boreal Realm. The Boreotrachyceras omkutchanicum Zone correlates with the Alpine Trachyceras aon Zone by the presence of the Trachyceras genus and stratigraphic position over the Stolleyites tenuis Zone and its analogs in British Columbia. The ammonoid complex of the Neosirennites armiger Zone includes Sirenites s.s., in particular, Sirenites ovinus Tozer species, known in the upper zone of the Lower Carnian of British Columbia (Sirenites nanseni), which allows comparison of the armiger and nanseni zones and, through it, with the upper part of the Alpine Austrotrachyceras austriacum Zone. 相似文献
17.
"海棠山灰岩"分布在陕西镇安海棠山一带,呈断块出露,面积约30km~2,厚度>120m。前人根据所采到的腕足、珊瑚等化石把这套地层笼统置于下石炭统,划归界河街组。最近我们在这套灰岩中处理出牙形石 Idiognathoides sulcatus sulcatus,Id.sinuatus,Idiognathodus deli-catus,Declinognathodus lateralis 等,其时代为纳缪尔晚期。因此,该灰岩的时代为维宪期纳缪尔晚期,而界河街组的时代为杜内期维宪早期。 相似文献
18.
贵州关岭三叠系竹杆坡组、小凹组头足类化石——兼论关岭生物群的时代 总被引：10，自引：1，他引：10
贵州关岭地区中、上三叠统竹杆坡组和小凹组产较丰富的头足类化石，计有11科19届37种，其中Enoploceras,Alloceratites,Sibyllites等属以及Trachyceras aon种系国内首次报道。自下而上可识别出(1)Xenopratrachyceras primum带；(2)Protrachyceras deprati带；(3)Protrachyceras costulatum带；(4)Trachycems multituberculatum带；(5)Sirenites cf. senticosus带等5个菊石带。讨论了每个菊石带的特征，并与国外同期菊石带进行了对比，指出(1)带与欧洲拉丁期早期R.reitzi带相当，(2)和(3)带分别与拉丁期晚期E.curionii带和P.archelaus带相当，(4)和(5)带分别与欧洲早卡尼期早期T.aon带和北美的早卡尼期晚期Sirenites nanseni带对比。关岭生物群产出层位与Trachyceras multituberculatum菊石带层位一致，时代应为早卡尼期早期。 相似文献
19.
首次报道了广西玉林林木北均塘组校深水相腕足动物群。论证了其较深水相的性质；讨论了部分种的演化；建立了四个腕足生物带；简述了与笔石带的关系并进行了国际对比；确定其时代为晚洛赫柯夫－早布拉格早期，得出腕足动物集群具有快速迁移能力的结论；鱼化石的发现也为我国华南早泥盆世早期海相与陆相地层的对比提出了线索。 相似文献
20.
N. V. Sennikov T. A. Shcherbanenko I. V. Varaksina N. G. Izokh E. S. Sobolev A. Yu. Yazikov 《Stratigraphy and Geological Correlation》2018,26(3):267-282
The age of the Paleozoic sedimentary successions of the Yuryung-Tumus Peninsula in the Khatanga Gulf is determined as Middle Devonian, late Eifelian, and the beginning of the early Givetian on the basis of the study of brachiopods, ammonoids, nautiloids, bactritoids, gastropods, and conodonts, and in the terminology of the standard conodont succession, these deposits are not older than the late Eifelian Tortodus kockelianus Zone, but include the terminal Eifelian Polygnathus ensensis Zone and the first Givetian Polygnathus hemiansatus Zone and are no younger than the beginning of the early Givetian Polygnathus varcus Zone. The Middle Devonian sedimentary successions of the Yuryung-Tumus Peninsula show the level of the global sedimentary Ka?ak Event. The areas of distribution of the Devonian sedimentary deposits in the Yuryung-Tumus Peninsula in the Khatanga Gulf should be considered as one of the fragments of the regional geological structures of a remote (isolated?) region of the Taymyr Fold System rather than a component of the structures of the northern Siberian Platform. 相似文献