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1.
描述的介形类化石标本采集于新疆塔里木盆地库车和喀什两地区,其中,齐古组产Darwinula-Timiriasevia组合,恰克马克组产Darwinula-Bisulcocypris为代表的介形类化石组合,其时代前者为晚侏罗世,后者为中侏罗世;俄霍布拉克组和克拉玛依组产以Bisulcompris-TungchuaniaDarwinula为代表的组合,其时代为早-中三叠世。  相似文献   

2.
郑淑英 《古生物学报》1995,34(6):722-730
描述的介形类化石标本采集于新疆塔里木盆地库车和喀什两地区,其中,齐古组产Darwinula-Timiriasevia组合,恰克马克组产Darwinula-Bisulcocypris为代表的介形类化石组合,其时代前者为晚侏罗世,后者为中侏罗世;俄霍布拉克组和克拉玛依组产以Bisulcompris-TungchuaniaDarwinula为代表的组合,其时代为早-中三叠世。  相似文献   

3.
滕格里沙漠晚更新世湖相沉积介形类及其环境意义   总被引:2,自引:0,他引:2  
腾格里沙漠晚更新世断头梁剖面分析出介形类7属7种,分别为Limnocythere inopinata,Darwinula stevensoni,Candona neglecta,Cyprideis torosa,Ilyocypris gibba,Cyclocypris serena,?Neocypridopsis sp.,其中Limnocythere inopinata和Darwinula ste  相似文献   

4.
黑龙江绥滨地区中侏罗世晚期绥滨组沟鞭藻类的发现   总被引:7,自引:1,他引:6  
本文对首次发现在黑龙江东部西三江地区绥滨51孔绥滨组中部的海相沟鞭藻类进行了初步研究,描述化石13属17种,其中含3新种Pareodiniasuibinensissp.nov.,Diconodiniumelipticumsp.nov.,Leptodiniumsonghuajiangensesp.nov.;认为以Pareodiniaceratophora,Nannoceratopsispelucida,Chytroeisphaeridiascabrata等优势种为代表的沟鞭藻组合的地质时代应为Calovian期,很可能为Calovian中晚期。  相似文献   

5.
西藏南部普普嘎剖面托尔阶和阿连阶的菊石   总被引:1,自引:2,他引:1  
西藏南部聂拉木县土隆村以北的普普嘎剖面产出丰富的下侏罗统菊石类化石。剖面上部的砂岩和灰岩中产出托尔阶和阿连阶的菊石,它们是Polyplectusdiscoides(Zieten),Grammo-cerasstriatulum(Sowerby),PhymatocerasrobustumHyatt,Bouleiceras?sp.,Dumortieria?sp.,Leiocerassp.,Cylicocerassp.。这些属种是在藏南首次发现的托尔阶和阿连阶的化石证据。  相似文献   

6.
腾格里沙漠晚更新世湖相沉积介形类及其环境意义   总被引:4,自引:0,他引:4  
腾格里沙漠晚更新世断头梁剖面分析出介形类7属7种,分别为Limnocythereinopinata,Darwinulastevensoni,Candonaneglecta,Cyprideistorosa,Ilyocyprisgibba,Cyclocyprisserena,?Neocypridopsissp.,其中Limnocythereinopinata和Darwinulastevensoni为优势种。根据丰度、分异度及百分含量变化情况,研究剖面划分出四个介形类组合,进一步结合年代数据、沉积物及孢粉资料识别出四个气候期。距今约42000-23000年间研究区总的气候特征是温暖湿润,间有几次幅度较小的变冷期;介形类显示出淡水至中盐水环境,这一特征持续整个沉积时期,没有出现干旱期。  相似文献   

7.
早白垩世单缝孢真蕨植物新材料及其分类归属   总被引:1,自引:0,他引:1  
在原位繁殖器官研究的基础上,描述了产于辽宁铁法盆地早白垩世地层中的单缝孢真蕨植物化石:Athyrium asymmetricum meng、Dryopterites gracilis sp.nov.D.liaoningensis sp.nov.和Asplnium popovii Samylina,并讨论了其分类归属.  相似文献   

8.
桐柏——大别造山带苏家河群早奥陶世微体化石及其意义   总被引:5,自引:0,他引:5  
根据发现的几丁虫Conochitinasp.,C.?sp.,Desmochitinasp.,D.brechyta,Lagenochiti-nacf.obeligis,L.cf.esthonica,Rhabdochitinasp.,Calpichitina?sp.和疑源类Lophosphaeri-diumsp.,Leiosphaeridiaspp.,Micrhytridiumsp.,?Acanthodiaerodiumsp.,Baltisphaeri-diumspp.等微体化石确定河南信阳西双河地区苏家河群浒湾组为早奥陶世。它是桐柏-大别造山带(河南部分)第一次发现的有可靠古生物证据的奥陶纪地层。同时为该造山带区域地层序列的建立积累了资料,并为与秦岭造山带的衔接提供了新线索。此外还指出浒湾组的几丁虫生物群属于华南古生物地理区。  相似文献   

9.
东北地区中生代化石木异木属及其古生态   总被引:5,自引:0,他引:5  
迄今为止,我国共了现异木属(Xenoxylon)化石木10种(包括2新种),它们是X.latiporosum,X.conchylianum,X.liaoningense,X.japonicum,X.ellipticum,X.hopeiense,X.peidense,X.yixianense,X.fuxinense sp.nov.,X.huolinhenese sp.nov.。文中对该属的古生态作了  相似文献   

10.
从福建、海南、广东与广西所设的22个采样点采获鳞盘虫属Diplectanum标本中,又有2种为新种。波茎鳞盘虫,新种Diplectanum undulicirrosum sp.mov与叉片鳞盘虫,新种,Diplectanum furcelamellosum sp.nov.,它们均以具特殊之交接器结构而区别于本属的其它虫种。  相似文献   

11.
袁凤钿 《微体古生物学报》2000,17(4):399-403,T012
准噶尔盆地侏罗纪介形类已由众多中外地层古生物工作者进行过数十年的研究并有系统成果问世。本文仅介绍两个侏罗系化石点,作为前人工作之补充,充实已有化石记录,也提出了进一步划分的建议和依据。  相似文献   

12.
吐鲁番盆地连木沁剖面齐古组轮藻化石   总被引:1,自引:0,他引:1  
吐鲁番盆地连木沁剖面侏罗系齐古组的轮藻化石在早年资料中未见提及。后期曾有不同单位多人次对此剖面进行观察实测,除偶有提起见到轮藻外,亦均未见描述报道,本文首次正式报道了齐古组的轮藻化石,为吐鲁番盆地齐古组与广布于新疆各地区的齐古组进行横向对比提供了这类化石依据。  相似文献   

13.
湖北秭归盆地中侏罗世泄滩组孢粉组合   总被引:4,自引:2,他引:2  
本文记录了鄂西秭归盆地东缘泄滩组上部21个属36个种的孢粉植物群,其中包括3个新种,讨论了主要属种组合特征和地层延限,根据中侏罗世孢粉植物群组合在国内外的对比,提出泄滩组上部Cyathidites minor-Classopollis-Callialasporites组合的时代属于中侏罗世,这个组合以桫椤科,掌鳞杉科植物的繁盛,和出现大量Cal-lialasporites母体植物为特点,暗示泄滩组上部形成于炎热而干旱的气候环境。  相似文献   

14.
西北地区潮水盆地侏罗系青土井群轮藻化石   总被引:2,自引:0,他引:2  
潮水盆地青土井群为一套含煤碎屑岩,在盆地东部潮参l井青土井群三段发育大量以Aclistochara占优势的轮藻化石群,其组合特征显示浓厚的晚侏罗世色彩。青土井群一、二段轮藻化石稀少,结合地层层序,推测其地质时代为早侏罗世。围岩沉积特征表明本井轮藻化石群为浅水生物群。  相似文献   

15.
依据闸岗剖面地表及钻井样品的分析鉴定,粤西怀集盆地白垩纪闸岗群马屋组产介形类化石10属17种,本文描述其中9属14种,包括1新种。介形类组合以Eucypris最繁盛,次为Ziziphocypris和Darwinula,称Eucypris hubeiensis-Ziziphocypris simakovi-Darwinula leguminella组合。马屋组与湖北贾店组的介形类组合面貌非常相似,可以进行对比,层位大体相当,其时代应属早白垩世最晚期(Albian)-晚白垩世早期(Cenomanian)。  相似文献   

16.
Mateus, O. & Milàn, J. 2009: A diverse Upper Jurassic dinosaur ichnofauna from central‐west Portugal. Lethaia, Vol. 43, pp. 245–257. A newly discovered dinosaur track‐assemblage from the Upper Jurassic Lourinhã Formation (Lusitanian Basin, central‐west Portugal), comprises medium‐ to large‐sized sauropod tracks with well‐preserved impressions of soft tissue anatomy, stegosaur tracks and tracks from medium‐ to large‐sized theropods. The 400‐m‐thick Lourinhã Formation consists of mostly aluvial sediments, deposited during the early rifting of the Atlantic Ocean in the Kimmeridgian and Tithonian. The stratigraphic succession shows several shifts between flood‐plain mud and fluvial sands that favour preservation and fossilization of tracks. The studied track‐assemblage is found preserved as natural casts on the underside of a thin bivalve‐rich carbonate bed near the Tithonian–Kimmeridgian boundary. The diversity of the tracks from the new track assemblage is compared with similar faunas from the Upper Jurassic of Asturias, Spain and the Middle Jurassic Yorkshire Coast of England. The Portuguese record of Upper Jurassic dinosaur body fossils show close similarity to the track fauna from the Lourinhã Formation. □Dinosaur tracks, Lusitanian Basin, Portugal, skin impressions, Upper Jurassic.  相似文献   

17.
新疆塔里木盆地侏罗系分布广泛,在库车凹陷和塔西南区发育最好。目前对库车凹陷的三叠纪和侏罗纪孢粉植物群研究较为深入,而对塔西南区侏罗纪孢粉化石专题研究不多,尚未建立孢粉组合。作者基于塔西南区乌恰中侏罗统塔尔尕组发现的孢子花粉33属48种的研究,建立了塔尔尕组孢粉组合。该组合以掌鳞杉科花粉Classopollis的优势和真蕨目桫椤科孢子Cyathidites的繁盛为特征,并含有丰富多样且颇具侏罗纪色彩的孢子花粉化石类型。该组合与西欧和俄罗斯巴柔期至巴通期孢粉组合以及北美和澳大利亚巴柔期至卡洛夫期孢粉组合可以进行对比;与我国新疆库车恰克马克组、陕西延安直罗组和湖北兴山沙溪庙组等孢粉组合也可对比。根据孢粉学证据,塔尔尕组的时代应属于中侏罗世晚期(巴通期至卡洛夫期)。当前孢粉植物群支持我国侏罗纪南北植物地理区系之西端分界之划分方案,即塔西南乌恰处于界线以南,而库车处于分界以北。  相似文献   

18.
For the first time, remains of post-Triassic temnosponyls are described from the southern Junggar Basin (NW China). Middle Jurassic material from the uppermost part of the Toutunhe Formation consists of several isolated but well preserved skull bones and intercentra from all regions of the body that can be attributed to a brachyopid. The material in part shares important autapomorphies withGobiops desertus Shishkin, 1991, from the Upper Jurassic of Outer Mongolia, and is consequently referred to this taxon, partially with reservation. This represents the first record of this genus from China. It also yields new anatomical data and permits an emended diagnosis.Ferganobatrachus from the Middle Jurassic of Kirghisia is probably, as also shown by the new material, congeneric withGobiops. Two fragmentary specimens from the lower part of the Upper Jurassic Qigu Formation are tentatively referred to the Brachyopoidea because of features of the skull, mandible and vertebral column. They probably both represent a single taxon that was larger and more massively built thanGobiops desertus but closely related to this form.   相似文献   

19.
甘肃潮水盆地潮参1井侏罗纪介形类化石   总被引:2,自引:0,他引:2  
潮水盆地潮参1井发现Darwinula-Timiriasevia化石组合,化石丰富.保存完好。组合特征显示其地质时代为中侏罗世晚期。  相似文献   

20.
Abstract: Isolated pterosaur and dinosaur teeth and a sauropod metatarsal I and manual phalanx V-1 from the Middle Jurassic (Callovian) Balabansai Svita in the northern Fergana Valley, Kyrgyzstan, are described and attributed to the pterosaur taxon Rhamphorhynchinae indet., a theropod Tetanurae indet., a sauropod Neosauropoda indet., and a new pachycephalosaurid Ferganocephale adenticulatum gen. et sp. nov. The Balabansai theropod is possibly a stem-lineage representative of Dromaeosauridae. The new pachycephalosaurid is the oldest representative of the group and extends its known history by 10–20 myr. The Balabansai vertebrate assemblage is most similar to the Callovian assemblages from the Qigu and Upper Shaximiao formations in China, and intermediate in the evolutionary level of the taxa present between the Bathonian assemblages from Wucaiwan and the Lower Shaximiao formations (China) and the Late Jurassic Shar Teg fauna from Mongolia.  相似文献   

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