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1.
Youhua Zhu Yuping Qi Binggao Zhang Hengren Yang Chengquan He Shihu Wang Wen Zhou Qiang Zhu Zheng Li 《Journal of Asian Earth Sciences》2007,29(5-6):715-721
The Qom Formation in the Central Iran Basin contains not only relatively abundant calcareous nannofossils and a small number of dinoflagellate cysts, but also a number of stratigraphically significant benthonic foraminifers and ostracods. Calcareous nannofossils reported for the first time from this formation include Coccolithus pelagicus, Cyclicargolithus abisectus, C. floridanus, Dictyococcites bisectus, D. scrippsae, Helicosphaera euphratis, Ericsonia fenestratus, Pontosphaera sp., Reticulofenestra dictyoda, R. minuta and Sphenolithus moriformis. Dinoflagellates include Homotryblium plectilum, Hystrichokolpoma rigaudiae, Operculodinium centrocarpum, Palaeocystodinium golzowense, Spiniferites pseudofurcatus and Thalassiphora pelagica. Benthonic foraminifers include Assilina aff. spira, Discocyclina sp., Neodiscocyclina cf. barkeri, Nummulites aff. variolarius, Operculina sp. and Orbitolites sp. Among the ostracods recovered are Alocopocythere dhansariensis, Asymmetricythere samalutensis, Bairdia montiformis, Cytherella jonesiana, Cytheretta virgulata, Cytheridea cf. bundensis, C. cf. scruposa, C. sp., Eopaijenborchella sp., Hermanites cf. grafica, Krithe oryza, K. cf. pernoides, Loxoconcha sp., Paracypris sp., Propontocypris zongbuensis, P. sp. and Xestoleberis sp. This assemblage indicates that the Qom Formation is Eocene in age instead of Middle-Late Oligocene to Early Miocene as previously determined. 相似文献
2.
Permo-Carboniferous Radiolarians from the Wupata＇erkan Group, Western South Tianshan, Xinjiang, China 总被引：1，自引：0，他引：1
The Wupata‘erkan Group, also called Wupata‘erkan Formation, distributed in the South Tianshan, Xinjiang,China, mainly consists of gray and dark gray fine-grained clastic rocks, interlayered with volcanic rocks, carbonates and cherts. Some ultra-basic rocks (blocks) punctuate the formation. The formation was variously assigned to Silurian-Middle Devonian, Silurian-Lower Devonian, and pre-Devonian, mainly based on Atrypa bodini Mansuy, Hypothyridina parallelepipedia (Brour.) and Prismatophyllum hexagonum Yoh collected from the limestone interlayers, respectively.However, radiolarian fossils obtained from 24 chert specimens of the Wupata‘erkan Group, mainly include Albaillella sp.cf. A. undulata Deflandre, Albaillella sp. cf. A. paradoxa Deflandre, Albaillella cf. A. deflandrei Gourmelon, Albaillella sp. cf. A. indensis Won, Albaillella sp. cf. A. excelsa Ishiga, Kito and Imoto, Albaillella sp. and Latentifistulidae gen. et. sp.indet., are earliest Carboniferous and Late Permian. The earliest Carboniferous assemblage is characterized by Albaillella sp. cf. A. undulata Deflandre, Albaillella sp. cf. A. paradoxa Deflandre, Albaillella cf. A. deflandrei Gourmelon and Albaillella sp. cf. A. indensis Won, and the Late Permian assemblage by Albaillella sp. cf. A. excelsa Ishiga, Kito and Imoto. This new stratigraphic evidence indicates that the Wupata‘erkan Group is possibly composed of rocks with different ages from Silurian to Permian, and therefore, it is probably an ophiolite mrlange. The discovery of Late Permian Albaillella sp. cf. A. excelsa provides more reliable evidence supporting the existence of a Permian relic ancient oceanic basin in the western part of Xinjiang South Tianshan. 相似文献
3.
保山西邑铅锌矿区香山组一段灰岩牙形石丰富,包括5属7种1个相似种及2个未定种,分别为:Ancyrodella curvata,A.nodosa,A.spp.,Ancyrognathus triangularis,Icriodus alternatus alternatus,I.sp.,Palmatolepis hassi,Pa.simpla,Polygnathus webbi,Po.cf.tenellus和Po.sp.。该牙形石组合面貌可与上泥盆统Late Palmatolepis rhenana带对比,表明研究区内香山组一段的时代为晚泥盆世弗拉斯期晚期,并非早石炭世。 相似文献
4.
Upper Hauterivian deposits in the Kurilovo area, Kamenica 1 section, NE of Niš, are described based of abundant and diverse orbitolinids. So far, the interval was assigned to the Barremian–Aptian on the geological map. Such a new age assignment results from the first detailed study carried out on the orbitolinid fauna contained in the Lower Cretaceous (upper Hauterivian) shallow-water limestones of eastern Serbia. The upper Hauterivian is documented on the basis of two key stratigraphic markers, specifically Valserina primitiva and Paleodictyoconus beckerae.In addition to these late Hauterivian index fossils, the studied section bears orbitolinids having a larger stratigraphic distribution: Cribellopsis neoelongata, Cribellopsis thieuloyi?, Montseciella glanensis, Orbitolinopsis debelmasi, Orbitolinopsis cf. debelmasi, Orbitolinopsis sp., Paleodictyoconus cuvillieri, Paleodictyoconus cf. cuvillieri, Paleodictyoconus cf. beckerae, Paleodictyoconus cf. actinostoma, Paleodictyoconus sp., Paracoskinolina? jourdanensis, Paracoskinolina cf. hispanica, Urgonina alpillensis, Valserina sp. The microfossil assemblage includes other foraminifers such as Charentia cuvillieri, Mayncina bulgarica, Nautiloculina cretacea, Pfenderina globosa, Pseudocyclammina cf. lituus, Pseudolituonella gavonensis, Ammobaculites sp., Bolivinopsis sp., abundant trocholinids, various miliolids, other foraminifers and sparse algae which will be presented separately. 相似文献
5.
The Jahrum Formation (Upper Paleocene to Middle Eocene) is composed of carbonate and dolomitic carbonate rocks in the Zagros Basin. The Zagros is located at the boundary between the Arabian and Eurasian lithosphere plates and represent the orogenic response to a collision between Eurasia and advancing Arabia during the Cenozoic. The study area is located in the northern part of Kuh-E-Tudej, ~175 km southeast of Shiraz in the Folded Zagros Zone. The Jahrum Formation at Kuh-E-Tudej, with a thickness of 190 m, consists of medium to massive bedded limestone. The following foraminiferal index species are identified in the studied section: Fallotella alavensis, Kathina sp., Miscellanea sp., Lockhartia sp.,Orbitolites shirazeinsis, Nummulites sp., Opertorbitolites sp., Dictyoconus cf. egyptiensis, Orbitolites cf. complanatus, Dictyoconus sp., Coskinolina sp., Somalina stefaninii, Discocyclina sp., Praerhapydionina sp., Coskinolina cf. liburnica, Nummulites cf. globulus, Nummulites cf. aturicus, and Alveolina sp. The age of the studied sediments ranges from Upper Paleocene to Middle Eocene. The microbiostratigraphic studies revealed four biozones based on the foraminifers identified in the studied section. 相似文献
6.
Discovery of Radiolarian Fossils from the Aiketik Group at the Western End of the South Tianshan Mountains of Chinaand Its Implications 总被引：1，自引：0，他引：1
LI Yuejun WANG Zhaoming WU Haoruo HUANG Zhibin TAN Zejinand LUO Juncheng Institute of Geology Geophysics Chinese Academy of Sciences Beijing Tarim Oil Field Company PetroChin Korl Xinjiang Zhu Xiling 《《地质学报》英文版》2002,76(2):146-154
The Aiketik Group, distributed at the western end of the South Tianshan Mountains, China, is an important lithostratigraphic unit involved in the South Tianshan orogen. It is separated from the adjacent rocks by faults. Generally, the geologists ascribed it to the Upper Carboniferous according to Pseudostaffella sp., Profusulinella sp. and Fusulinella sp. found from the limestone and sandy limestone of Aiketik. Our radiolarian fossils were obtained from the chert samples collected from the Haladaok section located at the upper Tuoshihan River. The fossils mainly include Albaillella undulata Deflandre, Albaillella paradoxa Deflandre, Albaillella sp. aff. A. paradoxa Deflandre, Albaillella sp. cf. A. deflandrei Gourmelon, Albaillella sp., Albaillella excelsa Ishiga, Kito and Imoto (?), Belowea variabilis (Ormiston et Lane), Callella cf. C. parvispinosa Won, Entactinia cf. E. tortispina Ormiston et Lane, Entactinia aff. E. tortispina Ormiston et Lane, Entactinia variospina Won, Entactinia sp., Eostylodicty 相似文献
7.
Stratigraphic Implications of Skeletal Microfossils from the Cambrian of Korea: A Preliminary Report
Byung-Su LEE 《《地质学报》英文版》2008,82(6):1152-1159
Diverse small shelly fossils and other associated fossils were recently recovered from the Cambrian Hanaeri section, southwestern Mungyeong, Korea. The fauna includes conoidal problematica, poriferans (sponge spicules), coeloscleritophorans (chancelloriids), brachiopods, monoplacophorans, trilobite (?) fragments, echinoderms, and conodonts. A preliminary assessment of faunal associations, stratigraphic implications, and the correlation of these skeletal fossils is given, based on occurrences of Actinotheca cf. mira (He), Microcornus sp., Torellela laevigata (Linnarsson), Torellela sp., Archiasterella quadratina Lee, Chancelloria sp., Lingulella sp., Prototreta sp., Phakelodus tenuis (Müller), Phakelodus elongates (An), Hertzina sp., and Furnishina sp. 相似文献
8.
Marie Coen-Aubert Olivier Monod Yves Plusquellec Francis Tourneur 《Geodinamica Acta》2013,26(1-2):68-93
A section near the Kilgen Lake (Adana Province) has yielded a fauna of rugose and tabulate corals including Disphyllum cf. rugosum (Wedekind, 1922), D. cf. curtum Hill, 1954, Wapitiphyllum sp., Thamnopora sp., and Alveolites sp. This coral assemblage is consistent with the previous Frasnian age assigned to the limestones of the Gümü?ali Formation. The rather well-preserved material provides new data on the structure and microstructure of Disphyllum and allows to describe in Thamnopora unusual calicinal morphology (septal ridges, median teeth, and pseudopercula) as well as new structures linked to the lateral increase (basal low wall, apical cul-de-sac). 相似文献
9.
J. b. Jago C. j. Bentley Lin Tian-rui K. d. Corbett 《Australian Journal of Earth Sciences》2013,60(7):959-966
A limestone lens within the Comstock Formation, from low in the Tyndall Group near the Lyell Comstock Mine near Queenstown, western Tasmania, contains a small trilobite fauna. The trilobites include Ammagnostus cf. laiwuensis, Kootenia sp., Sudanomocarina? sp. and a possible member of the Monkaspidae. These suggest an age somewhere in the range from the upper Ptychagnostus atavus Zone to the Lejopyge laevigata Zone, with regional stratigraphic correlations suggesting the latter zone. This is only the second Tasmanian Cambrian fossil assemblage described from limestone; almost all previously described Tasmanian Cambrian faunas are found in siltstones and shales. 相似文献
10.
The first fossil echinoids are recorded from the Cayman Islands. A regular echinoid, Arbacia? sp., the spatangoids Brissus sp. cf. B. oblongus Wright and Schizaster sp. cf. S. americanus (Clark), and the clypeasteroid Clypeaster sp. are from the Middle Miocene Cayman Formation. Test fragments of the mellitid clypeasteroid, Leodia sexiesperforata (Leske), are from the Late Pleistocene Ironshore Formation. Miocene echinoids are preserved as (mainly internal) moulds; hence, all species are left in open nomenclature because of uncertainties regarding test architecture. All Miocene taxa are recorded from single specimens apart from the 27 assigned to Brissus. Schizaster sp. cf. S. americanus (Clark) is compared to a species from the Oligocene of the south‐east USA. Brissus sp. cf. B. oblongus is close in gross morphology to a taxon from the Miocene of Malta. Leodia sexiesperforata is identified from fragments with confidence, being the only extant Antillean sand dollar with elongate ambulacral petals that is limited to carbonate substrates. The Miocene echinoids of Grand Cayman, although of limited diversity, are mainly comprised of genera common in comparable mid‐Cenozoic carbonate environments. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
11.
吉林省地质调查院在进行1：25万《多巴区幅》区域地质调查时，在西藏北部申扎县一带首次发现一套富含北方珠角石动物群Armenoceras sp.,Wutinoceras sp.,Discoactinoceras multiplerum Kobayashi,Adaomsoceras sp.,Sactoceras sp.,Ordosoceras sp.,Oncoceratida,Ormoceratidae,? Curtoceras sp.,Ormoceras sp.,Liulinoceras sp.,Deiroceras cf.globsom Zholt et Shen及腕足类、牙形刺、苔藓虫、海百合茎等化石的海相碳酸盐岩地层。该地层的岩石组合特征及生物群面貌与区内已知的地层存在明显的差异，其地质时代也明显早于区内已知的其它古生代地层，故建立下奥陶统拉塞组。 相似文献
12.
A selachian fauna is described for the first time from the Late Cretaceous (Campanian–Maastrichtian) of Senegal. So far, the Campanian Paki Formation has only yielded a single tooth of Rhombodus sp. whereas the Cap de Naze Formation has yielded a more diverse fauna including juvenile Cretalamna cf. Cretalamna biauriculata, Serratolamna serrata, Carcharias cf. Carcharias heathi, ?Carcharias sp., Squalicorax pristodontus, Schizorhiza stromeri, Parapaleobates sp., Rhombodus binkhorsti and Rhombodus andriesi. Teeth of juvenile Cretalamna largely dominate the assemblage. Such an assemblage confirms a Late Maastrichtian age for the unit 3 in the Cap de Naze Formation. The assemblage, although composed of cosmopolitan taxa, is similar to the contemporaneous selachian assemblage from the phosphates of Morocco. 相似文献
13.
南天山西端的乌帕塔尔坎群为一套灰色、深灰色细碎屑岩,夹火山岩、硅岩和碳酸盐岩,其中分布有一些超基性岩(块)。以往曾据灰岩夹层中的化石将其划归志留系-中泥盆统或前泥盆系。我们对乌帕塔尔坎群中所采集的24块硅岩样品进行室内分离和鉴定,发现的放射虫化石主要有Albaillella sp. cf A. undulata Deflandre,Albaillella sp. cf A. paradoxa Deflandre,Albaillella cf. A. deflandrei Gourmelon,Albaillella sp. cf. A. indensis Won,Albaillella sp. cf. Albaillella excelsa Ishiga, Kitoand Imoto,Albaillella sp.和Latentifistulidae gen. et. sp. indet.。其中可划分出两个放射虫化石组合,一个是以Albaillella sp. cf A. undulata Deflandre,Albaillella sp.cf A. paradoxa Deflandre,Albaillella cf. A. deflandrei Gourmelon和Albaillella sp. cf. A. indensis Won为代表的早石炭世早期的化石组合;另一个是以Albaillella sp. cf. Albaillella excelsa Ishiga, Kito and Imoto为代表的晚二叠世化石组合。说明乌帕塔尔坎群至少可能包含有志留系到二叠系不同时代的岩石,可能是蛇绿混杂岩。这是该群首次发现放射虫化石,特别是再次发现晚二叠世放射虫化石,进一步证实了南天山西段晚二叠世(残余)古洋盆存在的可能性。 相似文献
14.
E.A. Mancini 《Cretaceous Research》1982,3(3):241-259
Twenty-seven species of cephalopods are identified from an exposure of the Grayson Formation, Washita Group at the Waco Dam Spillway, McLennan County, north-central Texas. Mariella (Mariella) camachoensis (Böse), (?)Stomohamites sp., Engonoceras serpentinum (Cragin), Puzosia cf. crebrisulcata Kossmat, Mantelliceras cf. cantianum Spath, Mantelliceras saxbii (Sharpe), Sharpeiceras mexicanum (Böse), (?)Paracalycoceras sp., and Neohibolites sp. are reported from the Grayson Formation for the first time. The occurrence of Mantelliceras cf. cantianum, Mantelliceras saxbii, Sharpeiceras mexicanum, and (?)Paracalycoceras sp. indicates an early Cenomanian age for the Grayson exposed at the Waco Spillway locality. Previously, these mantellicerid ammonites have been recorded from the Buda Limestone interval which overlies the Grayson in north-central Texas. 相似文献
15.
《Proceedings of the Geologists' Association. Geologists' Association》2017,128(2):256-270
Three new Lower Cretaceous vertebrate sites (Vadillos-1, Vadillos-2, El Tobar) have been recently discovered and studied in the Cuenca Province (Central Spain). They are located in deposits of “Wealden” facies belonging to the El Collado Sandstone and Clay Formation. In these outcrops, micro and macroremains corresponding to plants, invertebrates and vertebrates have been collected and subsequently assigned to macrophytes, charophytes (e.g., Atopochara trivolvis triquetra, Globator maillardii trochiliscoides, Clavator harrisii harrisii), ostracods (e.g., Cypridea gr. modesta, Cypridea cf. C. isasae, Cypridea sp. aff. C. moneta, Cypridea sp. 1, Cypridea sp. 2), molluscs (Unionoida, Viviparus sp.), fishes, amphibians, turtles (cf. Eucryptodira), crocodyliforms (Neosuchia) and dinosaurs (ankylosaurs, ornithopods, theropods). Among the vertebrate remains, scales, teeth, plates, osteoderms, phalanges, ribs, vertebrae and other incomplete bones, as well as eggshell fragments have been identified. This rich and diverse assemblage was deposited in an upper Barremian alluvial-palustrine muddy floodplain crossed by braided sandy channels. 相似文献
16.
Martin A. Becker John A. Chamberlain Jr. Albert J. Robb Dennis O. Terry Jr. Matthew P. Garb 《Cretaceous Research》2009,30(4):1031-1040
The Fairpoint Member of the Fox Hills Formation (upper Maastrichtian) in Meade County, South Dakota, USA, contains an osteichthyan assemblage indicative of transitional to marine shoreface deposits. The fauna consists of: Lepisosteus sp., Paralbula casei, Cylindracanthus cf. C. ornatus, Enchodus gladiolus, Hadrodus sp., and indeterminate osteichthyans with probable affinities to the Siluriformes and Beryciformes. The Fairpoint fauna is of limited species diversity and in this character mirrors many other Upper Cretaceous North American osteichthyan assemblages. Comparison to Upper Cretaceous chondrichthyan diversity and consideration of the structure of Cretaceous marine food webs suggest that osteichthyans are strongly under-represented in the Upper Cretaceous of North America. The small size and poor preservation potential of many Upper Cretaceous North American osteichthyans probably account for much of this observed paucity. Fairpoint osteichthyans are members of families that survive the Cretaceous–Paleocene boundary extinction event. Some of these genera and families are still extant and occur in a wide array of modern fresh, brackish, and shallow marine environments. 相似文献
17.
在我国西南南盘江地区广泛分布着二叠系生物礁。可分为两种类型:1)堤礁;2)孤立礁。前者一般沿碳酸盐台地的边缘分布,后者发育于盆地内孤立碳酸盐台地的边缘。广南生物礁的礁后灰岩由浅灰色块状骨架岩组成。造架生物以串管海绵、纤维海绵、tabulozoans等为主,往往有蓝绿藻包覆。骨架生物之间有极为发育的纤状方解石胶结物。本文共描述了串管海绵8属12种,它们是Waagenella salinaria irregalaris Zhang,Waagenella sp., Rhabdactinita of columnaria Yabe and Sugiyama, Rhabdactinia sp., Intrasporeocoelia hubeiensis Fan and Zhang,Intrasporeocoelia sp., Uvanella guangnanensis sp. nov., Girtycoelia sp., Colospongia of dubia Laube, Colospongta sp., Verticillites sp.,Lichuanospongta typica Zhang. 相似文献
18.
Terrestrial arthropods from the Late Pleistocene of Jamaica: systematics,palaeoecology and taphonomy
The Red Hills Road Cave, Jamaica, is the most important site for terrestrial arthropods in the post‐Miocene of the Greater Antilles. Its fauna includes millipedes, isopods, crabs and insects, in addition to land snails and vertebrates. Arthropods are preserved in three dimensions and delicate structures such as limbs can be recognized. This unusual preservation was favoured by acidic groundwater rich in dissolved calcium carbonate; periods of high rainfall during which the bottle‐shaped cave was filled with water; and any arthropod washed in would have drowned. The absence of spiders, centipedes and most insects is due to the absence of carbonate in their exoskeletons. Millipedes and isopods possess a potential for preservation by carbonate mineralization that does not occur in other groups; they secrete calcium carbonate in the exoskeleton which hardens the cuticle and is water permeable, bringing about mineral replacement of the original structures. Within the cave, fossil millipede taxa include Rhinocricus sp. or spp., Chondrotropis sp., Caraibodesmus verrucosus (Pocock) and Cyclodesmus sp. cf. C. porcellanus Pocock. The isopod fauna includes Pseudarmadillo sp., Venezillo boonae Van Name, and Philoscia spp. 1 and 2. Crab claws belong to Sesarma sp. cf. S. cookei Hartnoll. Millipedes and isopods are particularly complete, representing drowned individuals fossilized soon after death; land crabs occur as fingers and rare chelae, suggesting that they may be exuviae. Only the most robust parts of insects have been discovered, but are particularly rare, consisting of three taxa of fly puparia and one possible beetle elytra. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
19.
云南兰坪盆地三合洞组的时代存在争议,有早古生代和中生代两种观点。本文通过对云南鲁史上三叠统三合洞组和挖鲁八组岩石地层、古生物化石、微体化石及碎屑锆石U-Pb年代学研究,认为三合洞组时代为晚三叠世。本区三合洞组生物碎屑灰岩、泥晶灰岩及白云质灰岩与挖鲁八组炭质板岩呈整合接触关系,与歪古村组砂质板岩呈逆断层接触关系,整体表现为倒转地层。挖鲁八组炭质板岩中采获叉皱海燕蛤、虚海燕蛤等晚三叠世化石,而三合洞组灰岩中的小欣德牙形刺、奥泽克刺、滑梯螺、长卵形槽花介等微体化石时代也为晚三叠世。笔者从挖鲁八组粉砂岩中获得碎屑锆石U-Pb年龄,其最小年龄为218 Ma,指示挖鲁八组的最晚沉积时代为晚三叠世。综合生物化石和同位素年代学资料,认为兰坪盆地三合洞组的时代为晚三叠世。 相似文献
20.
Alberto VALENCIANO JIANGZUO Qigao WANG Shiqi LI Chunxiao ZHANG Xiaoxiao YE Je 《《地质学报》英文版》2019,93(2):251-264
The first unequivocal remains of medium to large-sized mustelids from the middle Miocene Halamagai and Kekemaideng formations have been found in the Ulungur River area, Xinjiang, northwestern China. These new fossils are referred to the hypercarnivorous mustelid Hoplictis Ginsburg, 1961 and denote the first record of the genus in East Asia.We define Hoplictis baihu n. sp., for the mustelid from Tieersihabahe(Halamagai Fm.), which represents the smallest species of the genus. This primitive form is closer to H. florancei and H. noueli than to H. anatolicus and later, larger and more derived Hoplictis spp., from Europe and North America. A large toothless mandible from Duolebulejin(Kekemaiden Fm.) is assigned to Hoplictis cf. helbingi, and it presumably might represent the first record of H. helbingi outside Western Europe. The systematic position of Hoplicitis in relation to Ischyrictis with which it is similar is clarified. The occurrence in East Asia of two species of Hoplictis greatly expands the known distribution and diversity of the genus, and supports a Palaearctic Neogene dispersal event of carnivorans between Europe and Asia during the late Shanwangian–early Tunggurian equivalent to MN5–6 in Europe, and indication of another dispersal event from Europe to North America,through Northwest China during the late Tunggurian, equivalent to MN7–8 in Europe. 相似文献