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| 1 | The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System)显示文摘 | Xu Chen Jiayu Rong Junxuan Fan Renbin Zhan Charles E. Mitchell David A. T. Harper Michael J. Melchin Ping'an Peng Stan C. Finney Xiaofeng Wang | 2006 | Episodes2006，29，3： | 61 |
| 2 | Expansion of the Cathaysian Oldland through the Ordovician-Silurian transition:Emerging evidence and possible dynamics显示文摘Located northwest of the Jiangshan-Shaoxing Fault Zone,western and northwestern Zhejiang and northeastern Jiangxi provinces experienced major changes in bio-and litho-facies and paleogeography through the Ordovician-Silurian transition (late Katian,Hirnantian,and early Rhuddanian),as manifested by stratigraphic,paleontologic and synecologic records.Three geographic units under consideration are South,Central,and North areas.The western margin of the South area was occupied by the Huaiyu Mountains,whereas the other two parts were covered by the Zhe-Gan Sea during late Katian (Late Ordovician) time.In the early stage of the Changwu Formation deposition (late Katian),the sea was deepening northeastward,but with shallower conditions in the southwest and deeper conditions in the northeast.During mid to late stages of Changwu Formation deposition (latest Katian),the sea became much shallower and the sea bottom was uplifted substantially,which occurred somewhat prior to the global trend.During the Hirnantian (latest Ordovician) and early Rhuddanian (earliest Silurian),the study region became a shallow bay under expansion of the Cathaysian Oldland.There occurred a major drop of sea level and great changes in benthic biota with the occurrence of many new immigrants through the Ordovician-Silurian transition,which are closely related to a unique regional orogeny.The Yangtze and Cathaysian blocks may have amalgamated within the South China Paleoplate during this interval to cause the continuous uplifting and northwestward expansion of the Cathaysian Oldland. | RONG JiaYu ZHAN RenBin XU HongGen HUANG Bing YU GuoHua | 2010 | Science China Earth Sciences2010，53，1： | 37 |
| 3 | The Central Guizhou and Yi-chang uplifts, Upper Yangtze region,between Ordovician and Silurian显示文摘The Central Guizhou and Yichang Uplifts are present in central Guizhou to western Hubei. Biostrati-graphic evidences from more than 20 sections in 14 counties of this region provide the data about the duration of these uplifts. Although this duration differs from locality to locality, it is mainly from Ashgillian to Rhuddanian. The uplifts result from a horizontally driven movement to the South China Paleoplate from an uncertain block in southeast. Global sea-level drop during the end of the Ordovician made the uplifts obvious, particularly the Central Guizhou Uplift.It might have emerged above sea level in the short interval between the Ordovician and Silurian. | CHEN Xu RONG Jiayu ZHOU Zhiyi ZHANG Yuandong ZHAN Renbin LIU Jianbo FAN Junxuan | 2001 | Chinese Science Bulletin2001，46，18： | 17 |
| 4 | Early-Mid Ordovician brachiopod diversification in South China显示文摘Affected by paleogeographic position, paleoclimatic condition and depositional environments, the increase of the Early-Mid Ordovician brachiopod diversity of South China commenced at the beginning of the Ordovician (early Tremadoc), accelerated from the Tetra- graptus approximatus Biozone (base of Arenig), and reached its first acme in the Didymograptus eobifidus Biozone (mid early Arenig) when the number of brachiopod genera was over 7 times as great as that at the start of the Ordovician. This was the first radiation in the history of brachiopod macroevolution in South China, which occurred nearly 5 graptolitic biozones earlier than the global trend of the great Ordovician biodiversification (in the lower part of the Undulograptus austrodentatus Biozone). It is also characterized by (1) the origination or first occurrences of some major groups, such as the punctate dalmanelloids and the pseudopunctate stro- phomenoids including Plectambonitoidea (cardinal process simple or absent) and Stro- phomenoidea (cardinal process bilobed) in South China; (2) niche expansion, particularly in the first occupation of deeper water benthic regimes by the Euorthisina-Nocturnellia Association developed at Houping, Chengkou, northern Chongqing; and (3) the differentiation of brachiopod faunas under different environmental conditions. The gradual and increasing separation from Gondwana may have been one of the factors responsible for the radiation in South China. | ZHAN Renbin, RONG Jiayu, CHENG Jinhui & CHEN Pengfei Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing 210008, China | 2005 | Science China Earth Sciences2005，48，5： | 14 |
| 5 | Principal aspects of the Ordovician biotic radiation显示文摘The Ordovician radiation is among the major bioevents in earth history that have drawn great attention from geologists all over the world, and there have been hundreds of publications treating various aspects of this radiation. The study of the event involves a broad spectrum of research fields and concerns many scientific questions. Many opinions and hypotheses have been proposed on the triggering and controlling factors of the radiation. Herein the authors critically review the study of the Ordovician radiation and dissect four principal aspects by synthesizing the studies over the past years: (1) relationships of the radiation to fossil clades, ecotypes, and environments, such as water depth, latitude, and climate; (2) the ecological structure and food webs of Ordovician marine organisms; (3) fossil records and true biodiversities; and (4) likely triggering and controlling factors of the Ordovician radiation. The authors also recommend approaches to furthering studies of these aspects. | ZHANG YuanDong,ZHAN RenBin,FAN JunXuan,CHENG JunFeng & LIU Xiao LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China | 2010 | Science China Earth Sciences2010，53，3： | 13 |
| 6 | Temporal Distribution of Diagnostic Biofabrics in the Lower and Middle Ordovician in North China:Clues to the Geobiology of the Great Ordovician Biodiversification Event显示文摘在在诺思中国的更低、中间的奥陶纪的诊断简历织物的时间的分发清楚地说明 paleoplate 上的沉积系统作为大奥陶纪 Biodiversification 事件(护镜) 的后果显著地被改变了。沉积系统在 Tremadoc 显示扔了的护镜前普遍 microbialite 和扁平卵石的集团企业,和更少 bioturbation 的程度。通过早 Floian 的过渡时期,在其余部分的沉积系统早、中间 -- 护镜的奥陶纪变化由集中的 bioturbation 打字并且被描绘并且消失扁平卵石的集团企业和代用品潮汐的微生物引起的沉积。在在诺思中国的沉积系统的不可逆的变化被连接到 GOBE,它导致了的增加在动物区系的 tiering,扩大在与古生代的进化动物志的开发有关的新洞穴 ers 的动物区系的 ecospace,和外观在奥陶纪简历多样化期间。因此,在沉积系统的变化在 GOBE 的枢轴的时期期间是 benthic 动物志而非护镜的环境背景的陡峭的多样化的后果。 | LIU Jianbo ZHAN Renbin | 2009 | Acta Geologica Sinica(English Edition)2009，83，3： | 12 |
| 7 | Ordovician integrative stratigraphy and timescale of China显示文摘In this chapter, starting with a brief review of the research history and current status in the studies of the Ordovician chronostratigraphy in China, the subdivision of the Ordovician System, definition and recognition of its series and stage boundaries, and possible stratigraphic gaps are discussed in details in order to establish a multidisciplinary stratigraphic correlation through an integrated approach including lithostratigraphy, biostratigraphy, radiometric dating, chemostratigraphy and magnetostratigraphy. Being internationally accepted, the Ordovician System is now subdivided into three series and seven stages, in ascending order, Lower(Tremadocian, Floian), Middle(Dapingian, Darriwilian) and Upper series(Sandbian, Katian,Hirnantian). Three of the seven 'Golden Spikes' defining the bases of the Ordovician stages, which were established in 1997–2007, are located in China. As a regionally applied chronostratigraphy, the Ordovician System was subdivided in China into Lower(Xinchangian, Yiyangian), Middle(Dapingian, Darriwilian) and Upper series(Neichiashanian, Chientangkiangian,Hirnantian). This scheme agrees largely with the standard international classification, which can actually be directly applied to China, except for some special circumstances where the Neichiashanian and Chientangkiangian stages of the Upper Ordovician are used. Based on the new studies in recent years and distinctions and differences recognized in the development of the Ordovician System in the constituent terranes of China, a new framework for correlation among the major Chinese palaeoplates or terranes, e.g. South China, North China(including Tarim and Qaidam) and Xizang(Tibet)-western Yunnan, has been established. However, it has been recognized herein that uncertainties still remain on defining the base of the Tremadocian,Dapingian and Katian, and on the correlation between different mega-facies. More specifically, for the Tremadocian, the precise correlation of its base will depend on the better-defined conodont taxonomy, while for the Dapingian and Katian, on the correlation between different mega-facies. It is worthwhile to note that the chemostratigraphic studies of the Ordovician System in China produced the carbonate δ13 C curves for the Darriwilian(Middle Ordovician) and Katian(Upper Ordovician), which show significant differences from the composite global curve. Record of the Ordovician isotopic dating is relatively rare in China, with only three reliable ages from zircons that are all from the upper Katian to Hirnantian of the Upper Ordovician.Abundant bentonite beds in the Upper Ordovician of South China will also provide unique opportunities to advance the isotopic dating and related researches. Studies on the Ordovician magnetostratigraphy need to be significantly enhanced in China, as currently all the available results are restricted to the Lower Ordovician of North China, although they can be correlated with those known from other parts of the world. The analysis of the durational unevenness of the seven stages in the Ordovician supports the possibility to further subdivide the long-durational Tremadocian, Darriwilian and Katian stages, each into two substages. | Yuandong ZHANG Renbin ZHAN Yongyi ZHEN Zhihao WANG Wenwei YUAN Xiang FANG Xuan MA Junpeng ZHANG | 2019 | Science China Earth Sciences2019，62，1： | 6 |
| 8 | A deep water shelly fauna from the uppermost Ordovician in northwestern Hunan, South China and its paleoecological implications显示文摘It is the first time to document the trilobite Mucronaspis(Songxites) wuningensis and the brachiopod ParomalomenaAegiromenella Assemblage from the Xinkailing Bed(Hirnantian, uppermost Ordovician) in Taoyuan and Cili counties,northwestern Hunan Province. Synecological analysis shows that this is a deep water shelly fauna of South China during the Hirnantian. It lived on the upper Jiangnan Slope in northwestern Hunan, adjacent to the southeast margin of the Upper Yangtze Region, and belongs to the Hirnantia fauna with cool and deep water, and low diversity affinity, similar to its contemporary shelly faunas from the southern Shaanxi Slope adjacent to the north margin of the Upper Yangtze Region, the northern Chongqing depression(new name), and the Jiangxi-Anhui-Jiangsu gentle slope of the Lower Yangtze Region. Paleoecologically,it could be attributed to the BA 4–5 benthic regime(about 60–150 m deep, and deepest to 200 m), and was significantly different from the trilobite M.(S.) mucronata and the typical Hirnantia fauna while the latters may have habited in BA 2–3 benthic regimes(about 5–60 m deep). A new paleogeographic distribution pattern of the Hirnantian shallow and deep water shelly faunas of South China is herein proposed for the first time. Assuming that the depositional rate was constant in northwestern Hunan during the end Ordovician, the duration of the Xinkailing Bed might be only 12 thousand years according to the thickness of the Wufeng Formation and the absolute age values of those relevant graptolitic biozones. Such a short time interval may indicate that the global environmental change during the crisis was much shorter than previously thought, and its influence on the deep water regime was significantly shorter than that on the shallow water regime. | Jiayu RONG Xin WEI Renbin ZHAN Yi WANG | 2018 | Science China Earth Sciences2018，61，6： | 5 |
| 9 | α-and β-diversity Change of Late Ordovician Hirnantia Fauna of Changning,Sichuan,Southwest China显示文摘从通过到更低的 Lungmachi 形成的 Kuanyinchiao 形成的上面的 Wufeng 形成的连续奥陶纪志留纪边界节小心地在 Changning 的 Shuanghe 被测量了并且收集,南部的四川省。第一次,时间的变化 - 并且 Hirnantia 动物志的差异详细地被讨论了。腕足类动物的一种差异变化的一般趋势,向上增加,与 Yangtze 站台的地区性的趋势一致,它被内在、外来的因素控制了。然而,为在上面的 Kuanyinchiao 形成的一个短时期的差异的突然的落下可能被环境因素而非正常动物区系的周转控制了。用数字方法的 Synecological 分析认出 Hirnantia 动物志, Dalmanella-Kinnella 协会和 Mirorthis 协会的二个腕足类动物的一种主导的协会,两个都住在相应于 BA3 上面的 BA4 的近海的、更深的水环境,特别地更低的 BA3。 | ZHAN Renbin LIU Jianbo LIANG Yan LI Guipeng | 2011 | Acta Geologica Sinica(English Edition)2011，85，2： | 5 |
| 10 | Paleoecological associations of middle Llandovery (Silurian) corals from Huaying Mountain, eastern Sichuan Province显示文摘Corals are comparatively abundant in the upper member of the Baiyun'an Formation (upper Aeronian to lowerest Telychian, Llandovery, Silurian) of Huaying, eastern Sichuan Province, Southwest China. Three coral associations have been recognized, i.e., in ascending order, the Mesofavosites Association, the Dentilasma Association, and the Paraceriaster Association. The Mesofavosites Association occurs at horizons indicating a shallow and high-energy environment. It is dominated by large favositids accompanied by a few broken pieces of halysitids and small solitary rugose corals. The Dentilasma Association has a pretty high coral diversity, dominated by the solitary rugose coral Dentilasma meitanense, together with some subordinative heliolitids and favositids. The sedimentary evidence shows that this association might live in a quiet and nutritive shallow water environment. The Paraceriaster Association yields in the grayish green calcareous mudstone indicating a comparatively deep water environment. Systematically it contains abundant fasciculate Paraceriaster micropora and a few favositids. The distinction among these three coral associations shows that corals could adopt different adaptive strategies under different environments, which provide some new data for the investigation on the ecology of Silurian corals and further study on the 'Lower Red Beds'. | WANG GuangXu ZHAN RenBin DENG ZhanQiu LIU JianBo | 2013 | Science China Earth Sciences2013，56，4： | 3 |
| 11 | Silurian integrative stratigraphy and timescale of China显示文摘Silurian is a period with the shortest duration in Phanerozoic except for the Neogene and Quaternary. It represents an important and unique interval when the biotic diversity recovered quickly after the end-Ordovician mass extinction, different paleoplates or terranes conjoined, big oceans disappeared or narrowed, climate and sea level changed frequently, global biotic provincialism became weaker, some primitive plants started to occupy the land. Silurian is also the first system of which all the chronostratigraphic stratotypes(i.e. the GSSPs) including four series and seven stages were established by the International Subcommission on Silurian Stratigraphy(ISSS). Nonetheless, during the post-GSSP studies conducted by ISSS in the middle1980 s, some Silurian GSSPs were found to have some congenital defects such as no index fossils available that hinder the high resolution subdivision and correlation on a regional or global scale. In this paper, based on the latest development of Silurian study in China, the progress in biostratigraphy, chronostratigraphy, event stratigraphy(such as facies differentiation, heterochrony of black shales, marine red beds, carbonate rocks and reefs), chemostratigraphy, and tectonic stratigraphy(e.g., widespread of the late Silurian rocks in South China and its tectonic implication) are systematically summarized. Some existing problems and the areas to be focused in future work are also discussed. It is suitable for chronostratigraphic study to concentrate not only on the boundary but also doing multidisciplinary analysis on the biotic, chemical, magnetic, environmental, and chronologic aspects, in order to enhance the reliability and the potential for regional and global correlation of a certain GSSP.Some important achievements are expected in these areas in the Silurian study in China:(1) ecostratigraphy and basin analysis of the Llandovery, and the correlation of integrative stratigraphy with a high resolution;(2) establishment of the Wenlock to Pridoli chronostratigraphic framework;(3) the chemo-and magnetic stratigraphy and the age of some key intervals and horizons;(4)further investigation on paleogeography and plate tectonics; and(5) origin and early evolution of the terrestrial ecosystem. Some new breakthroughs might occur in the restudy on some of those problematic GSSPs of some particular series and stages. | Jiayu RONG Yi WANG Renbin ZHAN Junxuan FAN Bing HUANG Peng TANG Yue LI Xiaole ZHANG Rongchang WU Guangxu WANG Xin WEI | 2019 | Science China Earth Sciences2019，62，1： | 2 |
| 12 | Conodont diversification during the Ordovician:A perspective from North China and Tarim(Northwestern China)显示文摘Review of the literature on Ordovician conodont diversification in palaeoplates of North and Western China reveals that four diversity peaks are present in North China,occurring in the middle Tremadocian,early Floian,late Floian,and late Darriwilian,with three of these peaks(excepting that in the late Floian)also being recorded in Tarim.Three diversification intervals are present in North China,during the Tremadocian,late Floian,early and middle Darriwilian;comparable intervals are observed in the early and late Tremadocian,early Floian,and the Middle Ordovician in Tarim.The main conodont diversification episode in both palaeoplates took place in the Darriwilian,at the time of the Great Ordovician Biodiversification Event.A comparison of conodont diversity patterns in different palaeoplates(North China,Tarim,and South China)demonstrates that conodont radiation events mainly occurred within the Tremadocian,Floian,and Darriwilian.Conodont diversifications in these paleoplates also display some differences.In contrasting with Tarim and South China,North China witnessed a rapid conodont diversification during late Floian time.Conodont diversity in North China and Tarim increased continually and reached a peak in the late Darriwilian,concurrent with a prominent decreasing trend in South China.Differences of conodont diversification in these three palaeoplates may be related to their palaeogeography and tectonic history.When conodont diversifications in North China and Tarim are analysed on the background of palaeoenvironments,the main episodes are seen to be partly coincident with second order sea-level changes,particularly in North China.In general,conodont radiation correlates with large scale transgressions. | WU RongChang Ian G. PERCIVAL Svend STOUGE ZHAN RenBin | 2014 | Science China Earth Sciences2014，57，3： | 2 |
| 13 | The great Ordovician radiation of marine life: Examples from South China显示文摘The Ordovician radiation is the earliest and most important biodiversification event in the evolution of the Paleozoic Evolutionary Fauna (PEF), when the basic framework of PEF was established. The radiation underwent a gradual, protracted process spanning more than 40 million years and was marked by several diversity maxima of the PEF. Case studies conducted on the Upper Yangtze Platform (South China Palaeoplate) showed that the Ordovician radiation was characterized by drastic increases in a- and b-diversity in various groups of organisms. During the radiation, brachiopods, trilobites, and graptolites of the PEF became more diverse to dominate over the Cambrian Evolutionary Fauna (CEF) in all marine environments. At either global or regional scales, however, the Ordovician radiation was highly heterogeneous in time and space, and the rate and pattern of radiation exhibited by difierent major fossil groups were also variable. | Renbin Zhan Jisuo Jin Yuandong Zhang Wenwei Yuan | 2008 | Progress in Natural Science:Materials International2008，18，1： | 1 |
| 14 | Early-Middle Ordovician brachiopod dispersal patterns in South China显示文摘Paleobiogeographic patterns of the brachiopod faunas before and during the first radiation of the Great Ordovi-cian Biodiversification Event(GOBE)in South China at 6 different localities from the upper Jiangnan Slope to the vast area of the Upper Yangtze Platform show several interesting features.First,the initial brachiopod diver-sity acme was accompanied by both high origination and extinction rates.Second,no significant changes took place in the taxonomic composition and paleobiogeographic pattern of the brachiopod fauna during the radia-tion at 5 of the 6 localities studied except the near shore locality,where the first brachiopod radiation was much later than at other localities and was marked by a dramatic increase in endemic constituents.Third,orthides were the predominant brachiopod group during the radiation,and regional brachiopod taxa played a significant role in defining the paleobiogeographic pattern of the radiation.Fourth,the first brachiopod radiation was asso-ciated with 3 major pulses of onshore migration from the upper Jiangnan Slope through the central Upper Yang-tze Platform to the near shore settings of the platform,with the middle pulse being the most significant.Finally,paleogeographic dispersal took place in both onshore and offshore directions,although the onshore expansion was more prominent;several key brachiopods,such as Paralenorthis,Nocturnellia,Protoskenidioides,Nere-idella,Euorthisina and Yangtzeella,first appeared on the upper Jiangnan Slope and later formed distinct,and taxonomically diverse,communities on the Upper Yangtze Platform.The paleogeographic dispersal of brachio-pods is considered to be closely related to the tectonic evolution of the Qianzhong Arch. | Renbin ZHAN Jisuo JIN | 2014 | Integrative Zoology2014，9，2： | 1 |
| 15 | Temporal distribution of piperocks in Cambrian and Ordovician: A coevolutionary process with changes of paleoenvironment显示文摘Piperock, a kind of characteristic ichnofabrics in Phanerozoic, was thought to decline gradually from Cambrian to Ordovician. A new compilation on the occurrences of the Cambrian and Ordovician piperocks of China and the world shows that piperocks generally flourished in Cambrian and declined in Ordovician, but a sharp decrease occurred during Middle and Late Cambrian. The case-study on the piperocks from the Lower-Middle Ordovician Hongshiya Formation at Dabaochang of Qiaojia, northern Yunnan Province, Southwest China indicates that the forming and preservation of piperocks were controlled by the depositional environment, the intensities of predation, competition, bioturbation, and the contents of nutrition and oxygen in watermass. A careful study on the development of the Cambrian and Ordovician piperocks suggests that the decrease of nearshore siliciclastic sediments and the low contents of oxygen and nutrition in the watermass may have contributed to the decline of piperocks in Middle and Late Cambrian. | FANG Liang LIU JianBo ZHAN RenBin | 2012 | Science China Earth Sciences2012，55，1： | 1 |
| 16 | Reconstruction of the Yangtze Ramp during Floian to Darriwilian(Ordovician)in South China:Its Morphology,Controlling Factors and Significances显示文摘A robust stratigraphic framework and a coherent depositional ramp model for the Zitai,Dawan,Meitan and Ningkuo formations of Floian–Darriwilian age(Early–Middle Ordovician)in the Yangtze(Daoba,Xiangshuidong,Daling,Gudongkou and Honghuayuan sections)and Jiangnan regions(Nanba section)was created based on lithofacies and major element analysis.Three siliciclastic(LF1–3)and six carbonate(LF4–9)lithofacies are recognized representing sediments that were deposited in mixed siliciclastic and carbonate ramp environment.The intensity of mixed sedimentation and terrigenous input were evaluated using the elemental proxies Intensity of Mixed sedimentation(IM)and Aluminum Accumulation Rate(Al AR),as well as their mean values during certain time intervals.Mixed sediments are most well-developed along the marginal Yangtze region,strongly impacted by recurrent influx of westerly derived terrigenous materials in response to global eustatic changes and regional tectonic movements,shaping the gently southeast-dipping morphology.Regular terrigenous influx resulted in periods of enhanced primary productivity on the Yangtze Ramp as evidenced by matching biodiversity peaks in planktonic organisms,i.e.,chitinozoans and acritarchs.Brachiopods and other shelly fauna were also able to proliferate as new niches developed along the gently dipping ramp floor with substrate changes.The biodiversification patterns suggest that terrigenous influx controlled in part by regional tectonics played a more important role than previously thought in the development of Great Ordovician Biodiversification Event in South China. | LUAN Xiaocong Andre DESROCHERS WU Rongchang LIU Jianbo WANG Guangxu LIANG Yan ZHANG Yuchen WEI Xin LI Lixia ZHAN Renbin | 2023 | Acta Geologica Sinica(English Edition)2023，97，6： | 0 |
| 17 | Meganodular Limestone Points South China Paleoplate to the Late Ordovician Equator显示文摘Objective Time-specific litho-and biofacies often holds important information about unique ancient ecosystems that no longer exist on Earth today.This report summarizes one of such time-specific fades—the 3-D network structure of the Upper Ordovician Pagoda Formation in South China,as investigated by Zhan et al.(Palaeogeography,Palaeocli-matology,Palaeoecology,DOI:10.1016/j.palaeo.2015.07.039). | ZHAN Renbin JIN Jisuo LIU Jianbo | 2016 | Acta Geologica Sinica(English Edition)2016，90，1： | 0 |
| 18 | Evolution and paleogeography of Eospirifer(Spiriferida,Brachiopoda) in Late Ordovician and Silurian显示文摘Eospirifer,the oldest known genus of the spiriferide group(Brachiopoda),first appeared on the Zhe-Gan Platform of South China paleoplate during late Katian(Late Ordovician) represented by E.praecursor.It survived the end-Ordovician mass extinction,and reappeared on the Upper Yangtze Platform of South China paleoplate by the end of Ordovician near the upper part of the Normalograptus persculptus Biozone.Starting from the beginning of Silurian,Eospirifer experienced some morphological innovations and expanded its geographical distribution substantially.It reached its species diversity acme and the widest geographic distribution in Wenlock(middle Silurian),with the diversity hotspots in Laurentia,Avalonia,and Baltica.Various shell size frequency curves of E.praecursor under different paleogeographic settings suggest that this pioneer species of Eospirifer,with several macroevolutionary novelties,adopted a range of life strategies to adapt to the changing environments during early spiriferide evolution.There are also some morphological macroevolutionary trends during the evolutionary history of Eospirifer from Late Ordovician to the end of Silurian,such as the ever enlarging shell sizes and the width/length ratios from late Katian to Wenlock,but decreasing apparently of both parameters from Wenlock to Pridoli. | ZHAN RenBin JIN JiSuo LIANG Yan MENG LingKai | 2012 | Science China Earth Sciences2012，55，9： | 0 |
| 19 | Ordovician integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas显示文摘The Ordovician rocks on the Qinghai-Tibetan Plateau represent the oldest non-metamorphic strata,and are critical to understanding the history of regional geology and biotic evolution of the entire plateau.Strata of Floian,Darriwilian,Sandbian,Katian and Hirnantian are represented in the plateau with a hiatus of variable duration occurring underneath the basal Ordovician across the area.Five stratigraphical regions,including the Himalaya,Gangdise-Zayu,Qiangtang-Qamdo,Songpan-Garze,and Karakoram-Kunlun-Altun,are differentiated for the Ordovician strata,which are correlated with their equivalents in the Sibumasu,Indochina,Qaidam-Qilian,Tarim-Tianshan,and the Yangtze(western margin)stratigraphical regions.On the QinghaiTibetan Plateau,graptolites,conodonts,and cephalopods are the most common and useful fossils for the Ordovician biostratigraphy.The Ordovician biotas of the Qinghai-Tibetan Plateau bear some distinguishable palaeobiogeographical signatures,among which the cephalopods are characterized by the flourishing actinocerids of North China affinity in the Early-Middle Ordovician,and by the thriving lituitids and orthocerids of South China affinity in the Middle-Late Ordovician.Fossil occurrences and their palaeobiogeographical evolution provide critical evidence bearing on the reconstruction of the geological history of the Qinghai-Tibetan Plateau and surrounding terranes in northeastern peri-Gondwana.The stratigraphical successions of the Cambrian-Ordovician transition in the Himalaya and Lhasa and nearby Sibumasu terranes were significantly affected by the Kurgiakh Orogeny,which resulted in the extensive unconformity between the Ordovician and the underlying rocks in most areas of the Qinghai-Tibetan Plateau.In southern Xizang,a warm-water biota of Middle Ordovician age was recovered from oolitic limestones,suggesting a likely palaeogeographical location in low-latitudes near the equator.In the Himalaya and Sibumasu regions,the Upper Ordovician was typified by the occurrence of red carbonates with distinctive reticulate structures,which are correlative to their equivalents in the Yangtze region of South China,and might be deposited under similar geological conditions.The global end-Ordovician glaciation and sea-level drop likely caused the wide absence of late Katian strata in western Yunnan of China and the Shan State of Myanma,and may have also affected deposition in the Xainza and Nyalam areas of the QinghaiTibetan Plateau during this time interval. | Xiang FANG Yong Yi ZHEN Guangxu WANG Xin WEI Zhongyang CHEN Yan LIANG Xuejin WU Wenjie LI Chao LI Renbin ZHAN Yuandong ZHANG | 2024 | Science China Earth Sciences2024，67，4： | 0 |
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