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1.
Based on the palynological data from Well Ta-19-36 and Well Ta-19-37 in the Ta'nan Sag, and Well Ta-22-1 and Well Ta-21-1 in the Bayin Gobi Sag, a spore-pollen assemblage from the Damoguaihe Formation is named as Cicatricosisporites minutaestriatus- Aequitriradites spinulosus-Protopinus sp. assemblage in the Tamutsag Basin, Mongolia. The assemblage is characterized by abundant gymnosperm pollen and diverse fern spores, counted 46.35%–65.57% and 34.43%–52.58% in percentage respectively. Among the gymnosperm pollen, Pinuspollenites sp.(2.66%–16.94%), Protopinus sp.(0–11.38%) and Protopicea sp.(0–10.81%) are dominant; and Alisporites sp., Cerebropollenites sp., Podocarpidites sp., and Abietineaepollenites sp. are common. Some important elements, such as Chasmatosporites sp., Callialasporites prominulus, Parvisaccites sp., Parcisporites sp., Jiaohepollis cf. annulatus, J. bellus, J. verus, Polycingulatisporites sp., Schizaeoisporites certus, Classopollis annulatus are seen. Within the fern spores, Osmundacidites wellamanii(0.85%–4.93%), Appendicisporites sp.(0–4.45%), Baculatisporites comaumensis(0.80%–2.87%), Cicatricosisporites sp.(0.51%–2.66%), C. minor(0–2.14%), Foraminisporis asymmetricus(0–2.40%), Aequitriradites sp.(0– 2.19%) and Cyathidites minor(0–2.13%) are dominant; and some specie of Densoisporites, Cooksonites, Impardecispora, Pilosisporites, Schizaeosprites, Fixisporites, Leptolepidites, Trilobosporites, Kuylisporites, Klukisporites, Hsuisporites, Couperisporites, Maculatisporites are seen. The angiosperm pollen are rare in the assemblage, characterized by Clavatipollenites sp.(0–0.80%) and Songipollis sp.(0–0.27%). The geological age of the Damoguaihe Formation is assigned to Hauterivian – Barremian of Early Cretaceous according to the palynological data, due to the fact that there existed a lot of diverse spores of the family Schizaeaceae and prosperous gymnosperm saccat pollen which the corpus and sacci are differentiated completely, and the presence of early angiosperm pollen of Clavatipollenites. However, the zircon U-Pb isotopic dating of the volcanic rocks in the Nantun Formation indicated that the overlying strata of the Nantun Formation, i.e. the Damoguaihe Formation must be younger than 127.0±2.0–137.9±1.5 Ma. This is consistent with the palynological data. Furthermore, the vegetation reconstructed on the palynological data of the Damoguaihe Formation is conifer forest with shrubs and grassland, belonging to the semi-humid or humid middle to south subtropical climate. Moreover, three new species, namely Biretisporites punctatus sp. nov., Chasmatosporites reticulates sp. nov. and Concentrisporites contractus sp. nov. are described here. 相似文献
2.
Tatiana A. Kovaleva Valentina S. Markevich Ge Sun 《Russian Journal of Pacific Geology》2017,11(3):178-190
The taxonomic composition of the palynological assemblage of the Dongning Formation is supplemented. The palynological assemblage corresponds to those from the Lipovtsy Formation (Aptian) in the Razdolnaya Basin of Primorye (Russia) and the Muling Formation (Aptian) in the Jixi Basin of eastern Heilongjiang (China). It is found that the age of the Dongning Formation is Aptian. The palynological assemblage is characterized by dominance of spores of Gleicheniaceae; they are accompanied by spores of Cyatheaceae. The most important feature of the palynological assemblage of the Dongning Formation is the presence of angiosperm pollen (Tricolpites sp., T. micromunus, T. vulgaris, Retitricolpites georgiensis, R. vulgaris, Clavatipollenites hughesii, Quercites sparsus, Fraxiniopollenites variabilis). 相似文献
3.
The angiosperm pollen record from the Anfiteatro de Ticó and Punta del Barco formations (Baqueró Group) is reported. The relevance of these floras is that they are accurately dated as late Aptian, and one of the oldest floras southern South America with fossil angiosperms. Twelve samples were studied, showing Clavatipollenites and Retimonocolpites as dominant types. A new species, Jushingipollis ticoensis sp. nov., is proposed. A doubtful angiosperm pollen grain, Lethomasites sp., is also identified and described. A multivariate analysis of similarities between different Early Cretaceous angiosperm pollen assemblages suggests that the Baqueró Group assemblages have great similarities with other coeval units from Argentina, Australia and United States, which were located in a similar paleolatitude. 相似文献
4.
T. A. Kovaleva V. S. Markevich E. V. Bugdaeva E. B. Volynets M. A. Afonin 《Russian Journal of Pacific Geology》2016,10(1):50-62
Palynological samples, plant megafossils, and fossil wood taken from the upper Lipovtsy Subformation (Porechye open-pit coal mine in the Il’ichevka coalfield, Razdol’naya River Basin, southern Primorye), as well as coal samples for determining coal-forming plants from dispersed cuticles are analyzed. The taxonomic composition of the identified palynomorphs from the coals and interstratal clastic sediments indicates the Aptian age of host deposits. The palynological spectra from the lower humic–rhabdopissite coal seam are dominated by Gleicheniaceae and Cyatheaceae accompanied by Dicksoniaceae and Ginkgocycadophytus. In the palynological spectra from the upper coal seam, the share of Gleicheniaceae substantially decreases, though they remain dominant; simultaneously, single angiosperm pollen grains appear in them. The spectra from the clastic rocks are dominated by Polypodiaceae and Cyatheaceae. The taxonomical composition of the gymnosperms is relatively diverse, although their abundance is low. The share of angiosperms increases with respect to both their diversity and abundance. The angiosperm pollen, found for the first time in the Aptian deposits of the Razdol’naya River Basin, provides grounds to assume that these pants appeared earlier than previously thought (early Albian). The coal-forming plants of the Il’ichevka coalfield are determined. 相似文献
5.
《International Geology Review》2012,54(10):1840-1843
Spores and pollen have been obtained from four Upper Aptian ammonite- and pelecypod-bearing clays of the Badkhyz Highlands and Kopet-Dag. Species of Gleichenia and Classopollis are invariably present in large quantities, along with smaller numbers of pollen of Cupressaceae, Podozamitaceae, and Schizaeaceae. These spores and pollen can now be used as standards to identify deposits of the upper part of the Aptian stage.—D.C. McGregor 相似文献
6.
《Journal of Asian Earth Sciences》1999,17(1-2):301-306
Palynological study of northern Thailand coal and oil deposits indicates a similar palynological association to that of the Borneo region. Coal petrographic studies of these deposits show variations in the liptinite macerals, especially alginite types. The oldest of these coal and oil deposits, which are of Late Oligocene to Early Miocene age, are dominated by Botryococcus sp. or Botryococcus-related algae. Thick-walled lamaginites and spores and pollen of temperate affinity, are found in some areas. By contrast, thin-walled lamaginite is dominant in late Middle Miocene time. Resinite, suberinite, and cutinite are dominant in forest swamp coal deposits whereas alginite, cutinite and lycopodium spores are dominant in lacustrine environments. Exsudatinite is common even at early levels of maturation. These liptinite macerals can be major sources of oil and gas. 相似文献
7.
New plant macrofossil localities are found in the middle-upper part of the Albian Upper Hatira Formation of Makhtesh Qatan, an erosion crater in the northern Negev. These are so far the only outcrop localities in the Negev containing plant compressions and well-preserved sporomorphs. Their age assignments are controlled by the ammonite Knemiceras records below and above the plant-bearing sequence in the adjacent Makhtesh Hatira. The macrofossil assemblages are strikingly different in the sandy fluvial and shaly lacustrine facies, the former being dominated by Araucaria, Athrotaxopsis, Brachyphyllum and pinnatifid Sapindopsis, comparable at the plant assemblage and leaf morphological levels to the early to early late Albian assemblage of the North American Potomac flora. The lacustrine shale macrofossil assemblages appear archaic on account of their diverse pteridophyte component and sparse angiosperm remains. A new supposedly gnetophytic genus and species Qataniaria noae Krassilov, gen. et sp. nov. is dominant in the shale horizon. The sporomorph assemblages are strongly dominated by psilate trilete spores (87-93%). In the absence of elaterate forms, the angiosperm pollen Afropollis jardinus, Pennipollis, Tricolpites spp. and Walkeripollis sp. is consistent with the early Albian age. The abundance and diversity of conifers and the prominence of the fern bog assemblage suggest a relatively humid phase of the regional Albian climates. 相似文献
8.
A rich palynological assemblage consisting of algal remains (5 genera and 7 species, including dinoflagellate cysts), fungal spores (2 genera and 3 species), pteridophytic spores (5 genera and 8 species), gymnospermous pollen grains (3 genera and 3 species) and angiospermous pollen grains (17 genera and 22 species) has been recorded for the first time from the Miocene sediments exposed along Kullur-Kavur road, near Mangalore along the west coast of Karnataka. Among the important genera are: Achomosphaera, Leptodinium, Staphlosporonites, Hammenisporis, Polypodiaceaesporites, Quilonipollenites, Myricipites, Graminidites, Malvacearumpollis, Palaeomalvaceaepollis and Chenopodipollis. Qualitative and quantitative analyses reveal that the angiosperm pollen grains are dominant over pteridophytic spores and an overall, a warm and humid tropical-sub-tropical coastal climate with heavy precipitation is suggested for the site of deposition. The sediments were deposited in fluctuating conditions ranging from lacustrine to marine environments with fresh water swamps and ponds nearby. The occurrence of Hammenisporis, Polypodiaceaesporites, Quilonipollenites, Myricipites, Graminidites, Malvacearumpollis, Palaeomalvaceaepollis and Chenopodipollis in the present assemblage suggests an early Miocene age. A comparison of the present palynofloral assemblage with those known from the Indian Tertiary sediments shows its close resemblances with the Miocene palynoflora recovered from Quilon and Warkalli beds of Kerala basin. 相似文献
9.
The analysis of the composition of fossil palynomorphs from coals and clastic rocks of the Talyndzhan, Dublikan, Soloni, Chagdamyn, and Chemchuko formations of the Bureya coaliferous Basin revealed that the main coal-forming plants during the Talyndzhan and Dublikan time were represented by cyatheaceous ferns, plants similar to Pinaceae, and plants produced Ginkgocycadophytus pollen. In the Soloni time, the boggy plant communities were composed of dominant Cyatheaceae, subordinate Pinaceae, rare Gleichenaceae representatives, and Ginkgocycadophytus-producing plants. During the Chagdamyn time, the main coal-forming role belonged to gleicheniaceous ferns, bryophytes, and lycopsids, while the Chemchuko time was marked by the dominant contribution of Gleicheniaceae, Cyatheaceae, Ginkgocycadophytus, and plants close to Taxodiaceae to the coal formation. 相似文献
10.
The history of investigation of the common Jurassic and Cretaceous genus Pseudotorellia Florin (Ginkgoales) represented by needle-shaped, narrow linear or lanceolate leaves bearing several veins and characterized
by a single type of epidermis, is considered. An extended diagnosis of the genus and its taxonomic composition with regard
to the epidermal characters are reported; the stratigraphic and geographical range of its species and the genus evolution
are refined. Three new species Pseudotorellia asiatica N. Nosova et Kiritchkova, sp. nov., P. ketoviana N. Nosova et Kiritchkova, sp. nov., and P. samylinae N. Nosova et Kiritchkova, sp. nov. described from the Lower Jurassic (Toarcian) sediments, are proposed as the correlative
taxa within the Caspian oil and gas province. The stratotype and reference sections of the Lower Jurassic sediments in the
Mangyshlak Mountains are reported for the first time. 相似文献
11.
内蒙古海拉尔盆地大磨拐河组孢粉化石及其时代浅析 总被引：4，自引：0，他引：4
海拉尔盆地大磨拐河组所产孢粉化石分属于3个孢粉组合.下部孢粉组合以蕨类植物海金沙科孢子为主,重要分子有Cicatricosisporites australiensis, Cyathidites minor, C. gracilis, C. minutaestriatus, Appendicisporites problematicus, A.jonsonii,Pilosisporites verus, Impardecispora apiverrucata, I. purverulenta, Triporoletes reticulates, Aequitriradites echinatus等;中部孢粉组合则以两气囊花粉如Pinuspollenites, Piceaepollenites, Abietineaepollenites, Abiespollenites等占绝大多数,同时见少量被子植物花粉Asteropollis sp., Tricolpites sp.等;上部孢粉组合中裸子植物花粉略有减少,但仍占重要地位,重要分子有Cicatricosisporites australiensis, C. minutaestriatus,C. gushanensis, Impardecispora purverulenta ,Foraminisporites wonthagiensis, Aequitriradites verrucosus, Triporoletes singularis, T. reticulates, Polyporites? sp.等.上述孢粉组合大体可与松辽盆地登娄库组,黑龙江省东部城子河组、穆棱组,辽西地区沙海组、阜新组等对比,代表了中国北方早白垩世特有的植物群面貌,而其中Asteropollis, Tricolpites和Polyporites等被子植物花粉化石的发现,可能暗示大磨拐河组的时代为早白垩世中、晚期的巴列姆(Barremian)期-阿普第(Aptian)期,其上部可能上延至早阿尔必(Albian)期. 相似文献
12.
A palynofloral assemblage has been recorded from the intertrappean bed exposed at a new locality, near Naredi, on Naliya-Narayan
Sarovar Road in western Kutch, Gujarat. This intertrappean bed (ca. 0.6 m thick) of grey laminated clay is underlain and overlain
by the volcanic traps. The assemblage recovered from this bed includes algal and fungal remains, pteridophytic spores, angiospermous
pollen as well as cuticles of terrestrial plants. Important palynotaxa recovered are Azolla sp., Lygodiumsporites lakiensis, Polypodiaceaesporites intrapunctatus, Compositoipollenites argutus, C. conicus, Graminidites media,
Ladakhipollenites minutus, Lakiapollis ovatus, Matanomadhiasulcites sp., etc. Besides, a variety of fungal remains belonging to the genera Dictyosporites, Frasnacritetrus (Tetraploa), Kutchiathyrites, Palaeomycites (VAM fungi), Papulosporonites, Parmathyrites, Phragmothyrites, Polycellaesporonites (Alternaria), etc have been recorded. It has been deduced that this intertrappean bed was deposited in a shallow depression over the
trap during short interval of quiescence in a tropical-subtropical climate. The age of the intertrappean bed is suggested
as Early Palaeocene. 相似文献
13.
The crocodyliform faunas of the lowermost Cretaceous Rabekke and Jydegård Formations on the Baltic island of Bornholm, Denmark, and the Annero Formation of Skåne, southernmost Sweden, are represented by isolated teeth, osteoderms, and vertebrae. The rich Berriasian assemblage of the Rabekke Formation includes at least three distinctive taxa: Bernissartia sp., Theriosuchus sp., and Goniopholis sp., an association that is also known from several other contemporaneous European vertebrate localities. In contrast to this fauna, the Jydegård and Annero Formations have yielded only rare mesoeucrocodylian remains, which are assigned to Theriosuchus sp. and an undetermined mesoeucrocodylian taxon, possibly Pholidosaurus. Geographically, the Scandinavian localities represent the easternmost and northernmost distribution of typical continental Jurassic-Cretaceous crocodyliform communities in Europe. 相似文献
14.
Andy Gale 《Proceedings of the Geologists' Association. Geologists' Association》2019,130(6):659-672
Diverse thoracican cirripedes from the Hauterivian of the Hannover district of northern Germany are described, including seven species, belonging to five genera. Of these, a new genus belonging to the Scalpellidae, Jaegerscalpellum, includes one Hauterivian species, J. elegans sp. nov., an Aptian species, J. comptum (Withers, 1910) and an Albian species, J. politum (Darwin, 1851) are also referred to it. A new Cretiscalpellum, C. mutterlosei sp. nov. is described from the Hauterivian, and C. matrioni sp. nov. is described from the Middle Albian of France. The oldest record of the Unilatera Gale, 2018, Pedupycnolepas pulcher sp. nov. is described from the Hauterivian; this displays typical shell structure of the group, retained by living Verrucidae. Finally, four species of Zeugmatolepadidae, subfamily Martillepadinae, are recorded from the Hauterivian, including Martillepas hausmanni (Koch and Dunker, 1836), M. decoratus sp. nov., M. auriculum sp. nov. and Etcheslaepas borealis (Collins, 1990). The Hauterivian fauna from Hannover shows affinities both with Late Jurassic and later Cretaceous (Aptian-Cenomanian) forms, and includes the earliest scalpellids, unilateran (Pedupycnolepas) and Cretiscalpellum species known. It constrains the age of the Cretaceous cirripede evolutionary radiation to the earliest Cretaceous. 相似文献
15.
Kenneth Cole 《Quaternary Research》1983,19(1):117-129
Seven packrat midden samples make possible a comparison between the modern and late Pleistocene vegetation in Kings Canyon on the western side of the southern Sierra Nevada. One modern sample contains macrofossils and pollen derived from the present-day oak-chaparral vegetation. Macrofossils from the six late Pleistocene samples record a mixed coniferous forest dominated by the xerophytic conifers Juniperus occidentalis, Pinus cf. ponderosa, and P. monophylla. The pollen spectra of these Pleistocene middens are dominated by Pinus sp., Taxodiaceae-Cupressaceae-Taxaceae (TCT), and Artemisia sp. Mesophytic conifers are represented by low macrofossil concentrations. Sequoiadendron giganteum is represented by a few pollen grains in the full glacial. Edaphic control and snow dispersal are the most likely causes of these mixed assemblages.The dominant macrofossils record a more xeric plant community than those that now occur on similar substrates at higher elevations or latitudes in the Sierra Nevada. These assemblages suggest that late Wisconsin climates were cold with mean annual precipitation not necessarily greater than modern values. This conclusion supports a model of low summer ablation allowing for the persistence of the glaciers at higher elevations during the late Wisconsin. The records in these middens also suggest that S. giganteum grew at lower elevations along the western side of the range and that P. monophylla was more widely distributed in cismontane California during the Pleistocene. 相似文献
16.
Salah El Beialy Maher El-Soughier Sayed Abdel Mohsen Haytham El Atfy 《Journal of African Earth Sciences》2011,59(2-3):215-226
Palynological investigation of the Cretaceous Abu Roash, Bahariya, Kharita, Alamein, Alam El Bueib and Betty formations, encountered in the Gebel Rissu-1 well, north Western Desert, Egypt yielded 27 species of pteridophytic spores, 24 of gymnosperm pollen, 25 of angiosperm pollen and 11 of dinoflagellate cysts in addition to some acritarchs, foraminiferal test linings and freshwater algae. This enabled us to recognize five miospore biozones arranged from youngest to oldest as: Classopollis brasiliensis–Afropollis cf. kahramanensis–Dichastopollenites ghazalataensis Assemblage Zone (Late Cenomanian); Elaterosporites klaszii–Sofrepites legouxae–Afropollis jardinus Assemblage Zone (Middle/Late Albian–Early Cenomanian); Pennipollis peroreticulatus–Duplexisporites generalis-Tricolpates Assemblage Zone (Early Aptian–Early Albian); Tucanopollis crisopolensis–Afropollis sp. Assemblage Zone (Barremian) and Appendicisporites cf. tricornitatus–Ephedripites spp. Assemblage Zone (Late Neocomian).The Early Cretaceous Kharita, Alam El Bueib and the Betty formations encountered in the Gebel Rissu-1 well are interpreted to indicate oxic proximal and distal shelf deposits, characterized by type III/IV, V kerogen, which is gas prone but having little potential to produce hydrocarbons. The Upper Cretaceous Abu Roash and Bahariya formations are characterized by a distal suboxic–anoxic and marginal dysoxic–anoxic environment, and their kerogen type III/II indicates gas/oil prone nature. The Bahariya and Kharita Albian–Cenomanian sediments in the present study witnessed the onset of a semi-arid to arid climate, with local or seasonal humid conditions, based on the continuous high abundance of the elaterates pollen and Afropollis-producing plants that inhabited the paleotropical humid coastal plains. 相似文献
17.
The Lower Cretaceous (Albian) Sasayama Group in the Hyogo Prefecture of southwestern Japan has yielded various vertebrate fossils, including skeletal remains of dinosaurs, anurans, lizards, and mammals, and recently eggshell fragments. Here we report on numerous fossil eggshells from the bone-bearing Kamitaki locality in Tamba City, which represents a diverse dinosaur eggshell assemblage. Of the more than 90 eggshell fragments recovered, five different types were identified, including eggshells that likely belong to a variety of theropods (Nipponoolithus ramosus oogen. et oosp. nov., Elongatoolithus sp., Prismatoolithus sp., and Prismatoolithidae indet.) and at least one ornithopod (Spheroolithus sp.). All eggshells are relatively thin, and a new derived estimation method correlating egg mass with eggshell thickness indicates that they are among the smallest (28–135 g) theropod eggs known, likely laid by small bodied forms. The eggshell assemblage from this locality suggests that a diverse small dinosaur fauna, consisting primarily of theropods, nested in the region, a diversity yet to be evidenced from skeletal remains in Japan. 相似文献
18.
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
19.
《Cretaceous Research》1987,8(1):29-42
The poorly fossiliferous Late Cretaceous clastic series of Northwestern Sudan has been studied palynologically for the first time. Clay samples, rich in kaolinite, from the El Ghaba well, about 370 km NW of Khartoum, contain two terrestrial palynomorph assemblages dominated by tricolpate angiosperm pollen, but also include some gymnosperms (Inaperturopollenites, Steevesipollenites) and, very rarely, pteridophyte spores. The presence of Foveotricolpites giganteus, F. gigantoreticulatus, F. tienabaensis, Tricolpites sp. CI.13, and T. sp. SCI.294 suggests a Lower Senonian (Coniacian) age for the El Ghaba samples. Their sedimentary facies favours a possible correlation with the upper Wadi Howar or lower Kababisch Formation of the Gebel Abyad Basin in Northwestern Sudan. 相似文献
20.
史恭乐 李建国 谭覃 董重 李秋立 吴琼 章伯乐 尹素心 HERRERA Fabiany HERENDEEN Patrick S. CRANE Peter R. 《地层学杂志》2021,45(1):69-81
内蒙古东部霍林河盆地霍林河组是我国最重要的下白垩统含煤地层之一.该组产出大量不同种类且保存完好的植物化石,但因为缺乏海相沉积和火山岩夹层,我们对这套地层的精确年龄认知不足.我们最近在扎鲁特旗扎哈淖尔露天煤矿霍林河组发现了火山灰层,基于钻孔数据的地层分析显示该火山灰层位于霍林河组下含煤段的底部.二次离子质谱(SIMS)锆... 相似文献