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1.
笔者在研究云南东部中泥盆世和晚泥盆世早期孢子的过程中，发现丰富的大孢子．并进行了研究．本文图示的大孢子为8个属、30个种和变种．其中新种8个即；Verrucisporites reticuloides,V.lunanensis,Biharisporites microspinosus,Trichodosporites mirabilis,Nikitinsporites yunnanensis,N.sinensis,N.maximus和Lagenicula verrucosa等。云南东部中泥盆世和晚泥盆世早期大孢子组合基本上可与加拿大北极地区同期地层中的大孢子组合进行比较，亦可与西欧、原苏联和中国有关地层中的大孢子进行对比．该组合的研究对泥盆纪植物演化，地层划分与对比，古气候和沉积环境的研究有着重要的意义． 相似文献
2.
广州地区晚泥盆世至早石炭世地层及植物组合 总被引：2，自引：0，他引：2
广州地区晚泥盆世至早石炭世地层发育良好 ,出露地层为上泥盆统金钱岭组、沙水岗组以及下石炭统龙江组、石磴子组、测水组和梓门桥组 ,含有非常丰富的动植物化石 ,其中 ,广州市西北郊出露有陆相晚泥盆世至早石炭世地层的连续剖面 ,是研究陆相泥盆系与石炭系界线的理想剖面。含植物化石的陆相地层沙水岗组、龙江组和测水组中的植物化石可划分为 4个组合 ,自下而上为 :1) L epidodendropsis hirmeri- Sublepidodendron mirabile- H ama-tophyton verticillatum组合 ,代表沉积为沙水岗组 ,时代为晚泥盆世晚期 ; 2 ) Sublepidodendron mirabile-Rhodeopteridium cf. hsianghsiangense组合 ,代表沉积为龙江组 ,时代为早石炭世杜内期 ; 3) Cardiopteridiumspetsbergense- Triphyllopteris collombiana- Adiantites gothanii组合 ,代表沉积为测水组下段 ,时代为早石炭世维宪早期 ; 4) Archaeocalamites scrobiculatus- Cardiopteridium spetsbergense- Paripteris gigantea组合 ,代表沉积为测水组上段 ,时代为早石炭世维宪晚期 相似文献
3.
在西澳大利亚坎宁盆地泥盆纪生物礁组合和东澳大利亚昆士兰州密西西比纪生物礁详细调查和研究的基础上, 通过分析晚泥盆世至密西西比纪生物礁组合在古特提斯海4个不同地区的发育形式和演化特征对西澳大利亚坎宁盆地与中国桂林晚泥盆世生物礁组合以及东澳大利亚昆士兰与中国广西和西日本秋吉台密西西比纪的生物礁进行对比.第一次从构造、地层、古纬度和古气候方面来探讨古东特提斯海和北特提斯海晚泥盆世至密西西比纪生物礁的发育异同, 研究成果改进了对西澳大利亚、东澳大利亚、华南和西日本4个地区生物礁发育的认识, 从而可在全球角度上去探讨控制晚古生代生物礁发育的各种因素.研究的地质时段包含重要的生物绝灭事件, 也是温室向冰室的转折时期, 是全球范围造礁生物演替、更新和重新繁盛的阶段.研究成果对认识晚泥盆世至密西西比纪全球范围内造礁生物和生物礁类型与早、中泥盆世的区别, 对研究全球在这一时期古气候和古环境的变化都具有重要的意义. 相似文献
4.
通过对塔里木盆地阿瓦提-巴楚地区10口探井的石炭系-下三叠统的大孢子进行研究,建立了石炭纪-早三叠世大孢子组合5个(包括早石炭世、晚石炭世、早二叠世、晚二叠世及早三叠世大孢子组合各1个),并对国内外相关层位的大孢子组合进行了对比,讨论了其所在层位的地质时代.笔者为首次报道该地区早石碳世和二叠纪大孢子组合,对本区及邻区今后开展地层古生物研究及油气勘探研究意义重大. 相似文献
5.
塔里木盆地阿瓦提—巴楚地区石炭纪—早三叠世化石大孢子组合 总被引：1，自引：0，他引：1
通过对塔里木盆地阿瓦提－巴楚地区10口探井的石炭系－下三叠统的大孢子进行研究，建立了石炭纪－早三叠世大孢子组合5个（包括早石炭世，晚石炭世、早二叠世、晚二叠世及早三叠世大孢子组合各1个），并对国内外相关层位的大孢子组合进行了对比，讨论了其所在层位的地质时代。笔者为首次报道该地区早石碳世和二叠纪大孢子组合，对本区及邻区今后开展地层古生物研究及油气勘探研究意义重大。 相似文献
6.
西南地区早泥盆世地层的一个标准剖面及其植物组合的划分与对比 总被引：8，自引：0，他引：8
我国西南地区云南、贵州、四川、广西等省、自治区早泥盆世地层发育良好,化石丰富。过去,多偏重于海相沉积及其动物化石的研究,对陆相、海陆交互相地层及其植物化石的研究较少。因此,早泥盆世植物组合面貌不清,给地层的划分对比带来不少困难,也有碍于某些问题的进一步探讨。 相似文献
7.
西藏申扎地区早泥盆世珊瑚类生物地理分析 总被引：1，自引：0，他引：1
对西藏申扎地区早泥盆世珊瑚类的研究表明,申扎地区早泥盆世珊瑚群不论是从分异度、丰度还是分布范围上,都获得了极大的发展。通过分析西藏申扎地区早泥盆世珊瑚动物群组合,利用大冢系数的定量计算得出以下结论：申扎地区与我国云南丽江地区、西秦岭地区有着十分密切的联系,早泥盆世这3个地区为老世界大区（Old world realm）中的一个生物地理分区,并且进一步提出申扎地区与澳大利亚东部的关系密切。从混生的动物群角度上,印证了有关申扎地区是处于澳大利亚东部地区与我国华南之间过渡地区的观点。 相似文献
8.
昆仑造山带晚泥盆世沉积特征及构造古地理环境 总被引：6，自引：4，他引：6
昆仑造山带基本构造-地层格架奠基于古生代,晚泥盆世是加里东造山旋回和华力西造山旋回转换的关键阶段,加里东碰撞造山和其后的伸展裂陷等记录均存在于晚泥盆世沉积地层中。西昆仑晚泥盆世奇自拉夫组为一套紫红色碎屑岩沉积,属典型的碰撞造山型磨拉石建造,为加里东碰撞造山的产物;东昆仑晚泥盆世黑山沟组和哈尔扎组岩性组合特征与牦牛山组极为相似,均为一套陆相、滨浅海相的碎屑岩、碳酸盐岩和中酸性火山岩组合,为典型的裂陷伸展型磨拉石建造,是晚古生代裂陷伸展盆地演化开始的标志。 相似文献
9.
浙江晚泥盆世五通组中的楔叶类（Sphenophyllales）化石 总被引：2，自引：0，他引：2
本描述了产自浙江长兴泗安五通组中的几种楔叶类化石：Eviostachya hoegii(Stockmans)、Arch-aeocalamites sp.、Hamatophyton verticillatum Gu et Zhi、Sphenophyllum pseudotenerrimum(Sze)和Sphenophyllostachys sp.等。特别是Eviostachya hoegii的发现，为浙江晚泥盆世地层进行国际性对比，提供了新的依据。 相似文献
10.
湘南地区晚泥盆世地层发育,是该区金属矿床重要的赋矿层位。近年来我们分别在宁远大坝头地区佘田桥组和江永县城郊锡矿山组中发现了较为丰富的遗迹化石。与该区晚泥盆世生物群落景观比较,这些层段表现出不同的生物组合特征。遗迹化石的发现,为该区沉积环境和古生态学研究提供了新的资料,对地层划分对比也有一定的意义。本文研究的遗迹化石系1979年我们在关尹文副研究员带领下野外考察时发现的。笔者共采集化石标本十多块,分为两种类型。 相似文献
11.
Disperse megaspores were first found in the Lower Visean deposits of the Kaluga region (1P/A borehole). A layered distribution of the megaspores in the studied section is shown. A large number of megaspores were established in the lower part of the section of the Bobrikovskian deposits. Higher along the section, there is a trend to a decrease in the number of megaspores until they disappear completely in the Tula deposits. Two megaspore assemblages were identified. A great variety of species was observed in the lower assemblage; the dominant megaspores are Zonalesporites brasserti and Aphanozonatisporites triglobatus. The only dominant species was recorded in the upper assemblage, Zonalesporites brasserti, with a low species diversity of the entire assemblage. The miospore and megaspore assemblages that are typical of the Lower Visean in the section of the analyzed borehole are compared. 相似文献
12.
Twenty-nine megaspore species including six new taxa (Bacutriletes otwayensis sp. nov.,Erlansonisporites cerebrus sp. nov., Erlansonisporites decisum sp. nov., Hughesisporites coronatus sp. nov., Hughesisporites dettmanniae sp. nov., and Verrutriletes depressus sp. nov.) are documented from Aptian and Albian strata of the Gippsland and Otway basins, southeastern Australia. Together with six taxa known only from underlying Neocomian strata, these megaspores are used to establish four provisional biozones for the Lower Cretaceous that complement existing biostratigraphic schemes based on miospores and plant macrofossils. Megaspores are best represented in silty floodbasin facies and it is likely that the parent plants predominantly occupied moist understorey to fully aquatic habitats on the floodplain. Megaspores are sparsely represented in most other fluvial facies chiefly due to reworking of floodbasin sediments into higher energy channel and crevasse deposits. The relatively high diversity of lycophyte and fern megaspores contrasts with the scarcity of these plant groups in macrofossil assemblages. The megaspore record suggests that heterosporous cryptogams may have been significantly more prominent in the vegetation of this region than previously suggested. Several megaspores from southeastern Australia are closely comparable to forms from India and Argentina indicating broad similarities between Early Cretaceous heterosporous fern and lycophyte communities across Gondwana. These similarities also suggest that megaspores may be useful for inter-continental biostratigraphic correlation. 相似文献
13.
Rajni Tewari Naresh C. Mehrotra K. L. Meena S. S. K. Pillai 《Journal of the Geological Society of India》2009,74(6):669-678
Heterogenous megaspores recovered from the Upper Permian sediments of Kuraloi Area, Ib-River coalfield, have been systematically
described. The megaspore assemblage includes seven genera with seventeen species viz. Bokarosporites rotundus, Banksisporites indicus, B. utkalensis, Biharisporites spinosus, Biharisporites sp.A, Biharisporites sp.B, Jhariatriletes baculosus, J. srivastavae, J. damudicus, Manumisporites distinctus, Singhisporites baculatus, S. radialis,
S. surangei, Ramispinatispora indica, R. nautiyalii and Ramispinatispora sp. Additionally, a new species of Ramispinatispora viz. R.mahanadiensis has been identified. Associated spore pollen assemblages are suggestive of a Late Permian age corresponding to Raniganj/Kamthi
Formation. Raniganj megaspores are known from Damodar and Godavari Basins. The newly recorded megaspore assemblage from the
Ib-River coalfield is comparable to that of Raniganj/Kamthi Formation of Godavari Graben. The diversity in exosporium ornamentations
indicates structural diversity. Moreover, their prolific presence ultimately points towards occurrence of heterosporous source
vegetation in the area. 相似文献
14.
The freshwater ferns (Salviniales) are well represented in the Maastrichtian deposits of Cerro de los Fragmentos in the headwaters of the Río Chico, Golfo San Jorge Basin. The fossil material of Salviniaceae includes complete megaspore apparatuses with attached microspore massulae and dispersed megaspores, float systems and microspore massulae of Azolla. The new species Azolla colhuehuapensis displays distinctive morphological characters including relative small megaspore apparatuses with easily detached floats and usually attached eglochidiate massulae. The Marsileaceae are represented by the megaspore Molaspora lobata, microspores of Crybelosporites and vegetative remains of Marsileaceaephyllum sp. The assemblage also includes zygospores of the green filamentous algae Zygnemataceae, spores of Marchantiophyta and Monilophyta (Schizaeales), megaspores of Isoetalean affinity and Palm-type angiosperm pollen grains. All these organic microfossils and the associated palynomorphs indicate the presence of a freshwater environment where abundant water ferns were developing and reproducing. 相似文献
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17.
Early Triassic palynomorphs from Kuraloi Block,Belphar area,Ib-River coalfield,Mahanadi basin,Odisha
S. Suresh Kumar Pillai K. L. Meena Rajni Tewari Arun Joshi 《Journal of the Geological Society of India》2016,88(6):693-704
A rich assemblage of palynomorphs including miospores and megaspores has been recorded from the bore core no. IBKAN-2 drilled at a depth of 17.80m in Kuraloi Block-A, south-west part of the Ib-River Coalfield, Jharsuguda district, Odisha. The miofloral assemblage recovered shows prominence of cingulate, zonate, taeniate, non-striate and non saccate palynotaxa which indicate an early Triassic age and is comparable with the palynoassemblages of the same age known from the Damodar basin, India. The megaspore assemblage includes eight genera and fifteen species namely, Banksisporites karanpuraensis, B. indicus, B. utkalensis, Banksisporites sp., Barakarella pantii, Barakarella sp., Biharisporites spinosus, Biharisporites sp., Erlansonisporites triassicus, Erlansonisporites cf. erlansonii, Erlansonisporites sp. Jhariatriletes sp., Singhisporites sp., Ramispinatispora sp. and Talchirella trivedii. Records of megaspores are sparse in the early Triassic of Gondwana basins of India. The present study records the first occurrence of miospores and megaspores from the early Triassic of Mahanadi basin besides substantiating the earlier data. 相似文献
18.
《International Journal of Coal Geology》2007,69(1-2):21-54
Quantitative plant assemblage data from coal balls, miospores, megaspores, and compression floras from the Calhoun coal bed (Missourian) of the Illinois Basin (USA) are used to interpret spatial and temporal changes in plant communities in the paleo-peat swamp. Coal-ball and miospore floras from the Calhoun coal bed are dominated strongly by tree ferns, and pteridosperms and sigillarian lycopsids are subdominant, depending on geographic location within the coal bed. Although the overall composition of Calhoun peat-swamp assemblages is consistent both temporally and spatially, site-to-site differences and short-term shifts in species dominance indicate local topographic and hydrologic control on species composition within the broader context of the swamp. Statistical comparison of the Calhoun miospore assemblages with those from other Late Pennsylvanian coal beds suggests that the same basic species pool was represented in each peat-swamp landscape and that the relative patterns of dominance and diversity were persistent from site to site. Therefore, it appears that the relative patterns of proportional dominance stayed roughly the same from one coal bed to the next during Late Pennsylvanian glacially-driven climatic oscillations. 相似文献
19.
《Cretaceous Research》1988,9(3):265-283
Bulk maceration of sediments from the Dakota Formation of Kansas, USA yielded a diverse assemblage of dispersed plant fossils, consisting of megaspores, seed cuticles, algal cysts, and other small plant fragments. Species abundance data were collected from samples within this transgressive sequence, which includes depositional environments ranging from fluvial floodplain to lagoonal and interdistributary bay. Multivariate analysis revealed distinct trends in the distribution of species in different facies. Some taxa are restricted to non-marine deposits whereas others commonly occur in both the marginal marine and the non-marine deposits. Many of those found in the marginal marine deposits were probably transported downstream from plants that grew inland. The habitat of the parent plants of these fossils can often be inferred from both the distribution of the fossils and evidence of their botanical affinities. 相似文献