The Late Devonian Frasnian-Famennian (F-F) mass extinction is traditionally known as one of the “Big Five” faunal crises during the Phanerozoic. Ostracods are microcrustacea that first appeared in the Ordovician (Cambrian?) and are still developing today. Ostracods offer special insights into the characteristics of the Devonian bio-environmental events. So far, it is still ambiguous that how benthic ostracods from shallow to deep waters responded to the crisis. Moreover, pelagic ostracods are relatively rare in the F-F transitional interval and their responses to the F-F event are not clear as well. Recently, Dr. SONG Junjun from Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, together with her colleagues studied the Late Devonian ostracods from South China and Europe. The study showed that ostracods in varied environments responded to the F-F event differently. Namely, from the carbonate platform, slope, to basinal settings, the extinction rate of benthic ostracods at the F-F transition decreased with increasing water depth. Nevertheless, the F-F event caused substantial loss among pelagic entomozooidea lineages. The extinction pattern of benthic and pelagic ostracods in F-F event in South China is similar to the situation in Europe. But the extinction rates of benthic ostracods in shallow water and slope in Europe seems to be higher than that in the same situation in South China. The abundance and diversity of ostracods decreased and some species even disappeared in anoxic environments across the F-F boundary in South China, when there were rapid changes in the palaeotemperature of surface sea water. Article information: Song, J. J., Huang, C. & Gong, Y. M. *, Response of Ostracods (Crustacea) to the Devonian F—F event: Evidence from the Yangdi and Nandong sections in Guangxi, South China. 2019, Global and Planetary Change 173: 109-120. https://doi.org/10.1016/j.gloplacha.2018.12.015 Extinction pattern of the Devonian F-F transitional ostracods from South China Ostracod assemblages and extinction rates of benthic and pelagic species from shallow marine to deep marine setting in the F-F event. The relationship between variations in the abundance and diversity of benthic ostracods and changes of the marine
As one of the major groups in the Great Ordovician Biodiversification Event, cephalopods may have played a critical role in the marine environment. Their origins and radiations indicate the expansion of the marine ecosystem from the water bottom to open sea. However, the morphologic characteristic and diversity of the early cephalopods during the Cambrian–Ordovician transition have been poorly known. Recently, Dr. Fang Xiang and Prof. Zhang Yuandong from Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, and Dr. Bj？rn Kr？ger from University of Helsinki, Finland, conducted a research on the cephalopods from the latest Cambrian. In the study, all the published Cambrian cephalopod occurrences were analyzed using several quantitative methods, including cluster analysis (CA) and non-metric multidimensional scaling (NMDS). The results showed that the cephalopods first appeared during the late Cambrian in North China, and rapidly dispersed to South China, North America, and probably also to Siberia and Kazakhstan, showing their first evolutionary radiation. However, shortly afterwards, nearly 95% of these existing cephalopods disappeared abruptly in the Cambrian–Ordovician transition, with only several elements of two families surviving into the earliest Ordovician, which became the ancestors of the Ordovician and subsequent cephalopods. In addition, the rapid diversification of cephalopods during the late Cambrian approximately coincides with the origination and diversification of several other groups, e.g., graptolites and radiolarians, while the mass extinction of cephalopods in the Cambrian–Ordovician transition coincides with those of trilobites and brachiopods, and temporally with a major late Cambrian sea-level regression. This study was financially supported by the National Science Foundation of China, Chinese Academy of Sciences. This study is a contribution to the IGCP653 ‘The onset of the Great Ordovician Biodiversity Event’. Reference: Fang, X., Kroger, B., Zhang, Y.D., Zhang, Y.B., Chen, T.E., 2018. Palaeogeographic distribution and diversity of cephalopods during the Cambrian–Ordovician transition. Palaeoworld, DOI: https://doi.org/10.1016/j.palwor.2018.08.007. Range chart of early cephalopod faunas through the Cambrian and Ordovician transition and the diversity of some other major marine organisms. Palaeobiogeographic distribution of cephalopods during the latest Cambrian.
Representative palynomorphs from the Miocene Shengxian Formation in eastern Zhejiang Province (scale bar=20μm)The Miocene was a period in which significant environmental and climatic changes occurred. Global temperature began to rise since the late Early Miocene, then significantly decreased after the Mid-Miocene Climatic Optimum, which was accompanied by frequent fluctuations. In China, the zonal climate pattern linked to the planetary circulation system was transformed to a monsoon-dominated pattern similar to the present-day one, which had occurred at least by the early Miocene, giving rise to great environment and vegetation changes in this region. The Neogene Shengxian Formation is a set of strata consisting of basaltic rocks of multi-volcanic cycles and fluvial–lacustrine deposits, the latter is one of the most renowned localities of Neogene fossil plants in China. Isotope chronology studies show the volcanic activities related to the Shengxian Formation occurred during the Late Miocene to the earliest Quaternary, while the fossiliferous horizons are generally assigned to the Miocene which is mainly based on the fossil flora comparisons. Research progress on the palynoflora of the formation is still limited because these deposits either occurred as the intercalations or were formed in small rifted basins and intermontane basins with scattered distribution and small thickness, greatly preventing the accurate correlation among different sections. As sporopollen is an important palaeoenvironmental and palaeoclimatic proxy, it is necessary to establish a possible palynological succession for the in-depth study of the evolution of palaeovegetation and palaeoenvironment in east China. Recently, a group led by Prof. Wang Weiming from the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences provides a new insight into the palynoflora of the Shengxian Formation and its palaeovegetational and palaeoenvironmental implications. The result was published in “Review of Palaeobotany and Palynology” lately. According to the division of the volcanic belt within the distribution range of the Shengxian Formation, the research group carried out systematic pollen sampling and analysis. On the basis of compilation of previous studies and extensive correlation with existing sporopollen data, a Miocene palynological succession was established, including the late Early–early Middle Miocene Quercus E.–Liquidambar–Carya assemblage, the late Middle–early Late Miocene Quercus E.–Pinus–(Poaceae)–Trapa assemblage, and the late Late Miocene Quercus E.–Fagus–Artemisia assemblage. This palynological succession indicates that along with the changes of climate, the vegetation of the study area went through three periods, i.e., thermophilous arbors–dominated stage under the warm and humid climate, conifers–increased and aquatic plants Trapa–flourished stage, forests–shrunk and grassland–expanded stage, which were largely related to the global climate change at that time. Combining with fossil plants records, the zonal vegetation of eastern Zhejiang Province during the late Early–Late Miocene was similar to its modern type but with more distinct altitudinal zonality because of the occurrence of Larix. This study was financially supported by the National Natural Science Foundation of China, and the Strategic Priority Research Program of Chinese Academy of Sciences. Reference: Yi Yang, Wei-Ming Wang*, Jun-Wu Shu, Wei Chen, 2018. Miocene palynoflora from Shengxian Formation, Zhejiang Province, southeast China and its palaeovegetational and palaeoenvironmental implications. Review of Palaeobotany and Palynology. 259, 185-197.
Paleozoic stromatoporoids have long been considered to have emerged during the late Middle Ordovician. Five of seven families in the Order Labechiida appeared nearly contemporaneously during the Darriwilian throughout the low-paleolatitude regions of Laurentia, Siberia and Gondwana. This rather sudden and almost simultaneous widespread Darriwilian appearance of diverse early stromatoporoids has been explained by two different hypotheses: the conventional view states that the early stromatoporoids arose from one or two basic skeletonized rosenellids such as Cystostroma or Pseudostylodictyon, whereas the alternative hypothesis suggests that stromatoporoids rose from ‘a simple, non-calcifying sponge root stock’ that acquired the ability to secrete a mineralized skeleton during the Darriwilian. Recently, Dr. LI Qijian from Nanjing Institute of Geology and Palaeontology and his collaborators from South Korea have reported a new species of the most primitive rosenellid stromatoporoid Cystostroma (C. primordia sp. nov.) from the Hunghuayuan Formation (Lower Ordovician, Floian) of Guizhou Province in the South China Block (Figure 1) and the Duwibong Formation (Middle Ordovician, Darriwilian) of the Taebaeksan Basin in mid-eastern Korea (North China Block) (Figure 2). This species is the first representative of the genus found in both the North and South China blocks. Cystostroma primordia sp. nov. is characterized by the absence of denticles and distinctively smaller cyst plates than any other known species of Cystostroma. The presence of this new species in Lower to Middle Ordovician strata of western Gondwana challenges the long-held view of the late Middle Ordovician emergence of Paleozoic stromatoporoids. The simple internal morphological features of this new species and its occurrence in the Lower Ordovician of South China strongly indicate that an Early Ordovician Cystostroma-type precursor from western Gondwana is located near the base of the stromatoporoid stock. This occurrence greatly preceded the late Middle Ordovician (late Darriwilian) stromatoporoid diversification in circum-equatorial regions worldwide. Reference: Juwan Jeon, Qijian Li, Jae-Ryong Oh, Suk-Joo Choh, Dong-Jin Lee. 2018. A new species of primitive stromatoporoid Cystostroma from the Ordovician of East Asia. Geosciences Journal, DOI: https://doi.org/10.1007/s12303-018-0063-7 Photomicrographs of the labechiid stromatoporoid Cystostroma from South China. Field photographs of a stromatoporoid-bryozoan skeletal reef in the Duwibong Formation. Scale bars in Figures 2b and c = 1 cm.
The uplift of Tibetan Plateau had a significant impact on the evolution of regional and global climate during the Cenozoic including the origin and evolution of the Asian monsoon system and the aridification in northwestern China. The Lhasa terrane has been considered a key region for understanding the elevation history of the southern Tibetan Plateau after collision of continental India and Asia in early Paleocene. Stable isotopic studies consistently suggest that the Lhasa terrane had reached its near-present elevation before the Miocene. In a recent collaborative study by Dr. Gongle Shi, Professor Shuangxing Guo, and the research group of Professor Kexin Zhang from China University of Geosciences, Wuhan, a plant megafossil assemblage from the Kailas Formation of the Kailas Basin in western part of the southern Lhasa terrane was reported. The U-Pb dating and magnetostratigraphic correlation show that the studied section of the Kailas Formation ranges from 25.1 Ma to 21.8 Ma in age, and that the fossil flora occurred at 23.3 Ma (latest Oligocene). The uppermost Oligocene Kailas fossil flora is low in diversity and dominated by Populus, Betulaceae and legume. It most likely represents a deciduous, broad-leaf vegetation and suggests a temperate, humid environment with a low to moderate palaeoelevation of 1500–2900 m in the Kailas Basin during the latest Oligocene, based on the co-existing range of the living analogues of the fossil plants. This conflicts with the existence of a continuous, high Gangdese Mountains stretching across the whole southern Lhasa terrane in the late Oligocene. Available evidence appears to suggest strong uplift of the southern Lhasa terrane after the latest Oligocene. The research was recently published in “Palaeogeography, Palaeoclimatology, Palaeoecology”. This work is funded by the Foundation of the Geological Survey of China, the National Natural Science Foundation of China, and the Youth Innovation Promotion Association, CAS. Reference: Ai K., Shi G.*, Zhang K.*, Ji J., Song B., Shen T., Guo S., 2018. The uppermost Oligocene Kailas flora from southern Tibetan Plateau and its implications for the uplift history of the southern Lhasa terrane. Palaeogeography, Palaeoclimatology, Palaeoecology. DOI: 10.1016/j.palaeo.2018.04.017.https://www.sciencedirect.com/science/article/pii/S0031018217307496 Populus from the uppermost Oligocene of the Kailas Basin
During late Cretaceous to Palaeogene, there were many terrestrial salty basins in Eastern China. Many of the basins are the main oilfields in Eastern China, and salt rocks in the basins formed good cap rocks for gas and oil. Since 1970s, it has been debated that these basins were terrestrial salt lakes or transgressed by sea. The Palaeogene Shahejie Formation in the Shulu Sag of Huabei Oilfield developed a great thickness of sediments of evaporate rocks, among which layers of mudstones also occurred. Dr. Cheng Jinhui and Dr. Meng Fanwei of Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences and Dr. Zhao Yanjun of Chinese Academy of Geological Sciences discovered some well-preserved fossils of dinoflagellate cysts in this formation. Salt rocks and assemblage of fossil dinoflagellate cysts indicate a palaeoenvironment of salt lake. The discovery not only indicates the palaeoenvironment of late Palaeogene, but also is helpful for the evaluation of oil source rocks in this set of salt-bearing strata. Reference: Cheng, J., Zhao, Y. & Meng, F. 2018. Paleogene organic-walled dinoflagellate cysts in the Shulu Sag, Hebei Province, China. Carbonates and Evaporites. DOI: https://doi.org/10.1007/s13146-018-0456-8 Mudstones interweaved with salt in core NY3 in the Shulu Sag. Dinoflagellate cysts from Core NY3 in the Shulu Sag.
Based on multivariate morphometric analysis, Halysites catenularius is identified from the Rumba Formation (Telychian) and Jaagarahu Formation (Sheinwoodian) of Estonia; H. priscus is confirmed as a junior synonym. Halysites catenularius, H. junior and H. senior are shown to be closely related; H. catenularius is morphologically intermediate. Cyclomorphism in H. catenularius, recorded by fluctuations of corallite tabularial area, indicates an average annual growth rate of 6.0 mm, which is typical for halysitids. Tubules in H. catenularius, generated from small intramural openings between adjacent corallites, were involved in two types of interstitial increase. The intramural openings, three types of lateral increase, temporary agglutinated patches of corallites, and axial increase documented in H. catenularius resemble features in some species of Catenipora. These similarities are consistent with the interpretation that Halysites evolved from Catenipora. Evaluation of the possibility that both genera are polyphyletic will require further detailed analysis of additional species. Reference: Liang, K., Elias, R.J., Lee, D.-J. 2018. Morphometrics, growth characteristics and phylogenetic implications of Halysites catenularius (Tabulata, Silurian, Estonia). Journal of Paleontology. https://doi.org/10.1017/jpa.2018.73 Growth cycles detected from fluctuations of corallite tabularial area base on serial peels A new offset developed by interstitial increase and formation of new tubules (arrows) in Halysites catenularius New offsets developed by lateral increase (arrows) in Halysites catenularius
The Lopingian is the uppermost series of the Paleozoic and it is bracketed by two major biological events – the pre-Lopingian crisis and the end-Permian mass extinction (EPME). It also records the most dramatic environmental changes during the Phanerozoic. A high-resolution temporal framework is essential to understand the patterns and causes of the extinctions. Lopingian strata of South China have been intensively studied because three GSSPs have been defined by the FADs of conodont species in the region. In addition, as the most important fossil group for Lopingian biostratigraphy, conodonts are selected as the international standard to recognize boundaries and to correlate stratigraphy. Thus, a high-resolution conodont succession for the Lopingian strata from South China is vital to establish an integrative timescale. Recently, Dr. Dongxun Yuan from Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences updated the integrative timescale, including biostratigraphy, chemostratigraphy, magnetostratigraphy, cyclostratigraphy and geochronology, for the Lopingian (Late Permian) based on results from newly-collected samples from the uppermost Guadalupian to the lowest Triassic at the Shangsi section, South China. The entire Lopingian high-resolution conodont succession was for the first time, since the Lopingian Series was adopted as the international standard, recognized at a single section in South China and the succession correlated very well with the Lopingian GSSP sections at Penglaitan and Meishan. The conodont succession was also temporally calibrated by geochronologic ages, identified 405-kyr eccentricity cycles, and a Monte Carlo analysis. The framework provided the possibility that the current high-resolution marine international standard can be correlated with nonmarine strata by means of magnetostratigraphy and cyclostratigraphy. The study also adopted the Unitary Associations approach to establish unitary association zones (UAZs) and test these conodont biozones based on seven important Lopingian sections of South China. The main contradictions between UAZs and biozones, especially at the PTB interval, were discussed, and the correspondence between UAZs and biozones of the Shangsi section provided a practical example to understand controls on conodont UAZs. The PTB of the Shangsi section was constrained in view of ammonoids, bivalves, conodonts, U-Pb ages and mass extinction event, and updated ages for the base of the Lopingian and base of the Changhsingian were provided. Reference: Yuan D.X.*, Shen S.Z., Henderson C.M., Chen J., Zhang H., Zheng Q.F., Wu H.C., 2019. Integrative timescale for the Lopingian (Late Permian): A review and update from Shangsi, South China. Earth-Science Reviews, 188: 190-209. DOI: https://doi.org/10.1016/j.earscirev.2018.11.002. Exposure of the Shangsi section and outcrops showing the PTB interval
Lopingian stratigraphic framework at the Shangsi sect
Tommotiids are a group of Early Cambrian fossils with multiple small organophosphatic sclerites, and are a kind of extraordinary animals occurring during the Cambrian Explosion. Due to lack of well-preserved scleritome fossils, their zoological affinities had been uncertain for a long time. Over the past years, discovery and study of some articulated scleritomes indicate that tommotiids may belong to stem-group brachiopods. Though their soft-part anatomy is hitherto unknown, it has been argued that bivalved brachiopod shells probably evolved from an Eccentrotheca-like stem group ancestor through intermediary forms (e.g. Paterimitra pyramidalis) by the successive stages of sclerite reduction, specialization and tube shortening. Although tommotiids are common and globally distributed in the Lower Cambrian, they were not discovered from North China Platform yet. Recently, PhD candidate PAN Bing from the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences and colleagues from Australia and Sweden reported the first discovery of the tommotiid Paterimitra pyramidalis from the Lower Cambrian Xinji Formation of North China Platform. Paterimitra pyramidalis was previously only found from the Early Cambrian of Australia, and its articulated coniform scleritome specimens from Australia with three morphotype sclerites indicate that it was probably a sessile filter feeder (attaching to hard substrates via a pedicle). Like the Australia material, the disarticulated sclerites of P. pyramidalis from the Xinji Formation include three morphotypes, i.e., S1, S2 and L sclerites. This discovery not only represents the first occurrence of P. pyramidalis outside Australia, but also it is the first report of tommotiids in North China. The previous discovery of Paterimitra pyramidalis sclerites in a range of lower Cambrian carbonate depositional facies from south and central Australia (part of the eastern Gondwana in early Cambrian) demonstrates their dispersal ability along epeiric platform. Its occurrence in North China suggests that P. pyramidalis should have a relatively longer planktotrophic larval period to let its larvae cross the oceanic barriers between eastern Australia and southern North China in the early Cambrian. But, the exclusive occurrence in Australia and North China indicates their dispersal ability is limited and hints that these two regions should have had close palaeogeographic proximity in that interval. The exact palaeogeographic position of the North China Platform in the early Cambrian has long been controversial. It has been variously placed along the margin of western Gondwana bordering today's north-eastern India, or as an independent continent in either close juxtaposition to the north of Australia, or close to north-eastern margin of Australian East Gondwana, or located thousands of kilometers to the east of Australia in the Palaeo-Pacific Ocean. The co-occurrence of P. pyramidalis and many other shelly fossils in both the North China Platform and Australian East Gondwana supports that these two areas had a close palaeobiogeographic link during the early Cambrian. This research was recently published in Gondwana Research, and was supported by grants from the National Natural Science Foundation of China, the Chinese Academy of Sciences and Swedish Research Council. Reference: Pan, B., Brock, G.A., Skovsted, C.B., Betts, M.J., Topper, T.P., Li, G.X.*, 2018. Paterimitra pyramidalis Laurie, 1986, the first tommotiid discovered from the early Cambrian of North China. Gondwana Research, 63: 179-185. doi:10.1016/j.gr.2018.05.014 Paterimitra pyramidalis Laurie, 1986 from the Xinji Formation, Cambrian Epoch 2, North China. Palaeogeographic distribution of Paterimitra pyramidalis in Cambrian Epoch 2 (palaeogeographic map modified from Torsvik and Cocks, 2013b; Yang et al., 2015).
The Qinghai-Tibet Plateau which is made up of multiple blocks has a complicated geological history. The different geographical locations of these blocks resulted in different fauna during the geological history because of the presence of pronounced thermal gradients. The Permian faunas and their paleobiogeographic affinities have been proved to be the reliable data to recognize the paleogeographic position for many Tibetan blocks. The Upper Permian strata of Lhasa Block have been previously considered as continental strata with fossil plants. Consequently, it was believed that the Lhasa Block had been uplifted into land during the Late Permian. The Lopingian marine strata have been reported in Lhasa Block in recent years, which challenges the traditional viewpoint. However, the taxonomy and palaeobiogeography of these marine faunas remain uncertain. Recently, Prof. ZHANG Yichun, researchers at the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences, conducted a research on the foraminifers from the topmost part of the Xiala Formation in the Tsochen area, central Lhasa Block. The fauna mainly consist of Colaniella, Reichelina, Sphaerulina, Neodiscus, Langella and Geinitzina, indicating a Changhsingian age. The most typical feature of this fauna is the absence of Palaeofusulina. More importantly, no Palaeofusulina fauna has been reported in the whole Lhasa Block and such is the case for those Gondwanan blocks. But the Palaeofusulina species has been reported in the west of South Qiangtang Block. It suggests that the South Qiangtang Block would have drifted northward to a low latitude region during the Changhsingian, but the Lhasa Block may still locate at a relatively southern position. This indicates that the Bangong-Nujiang Ocean has a considerable width at that time, which is consistent with the view that the Bangong-Nujiang Ocean opened before the Middle-Late Permian. On the other hand, the Permian sedimentary sequence and faunas of the Lhasa Block exhibits a great difference to the South Qiangtang Block and Himalaya terrane. Therefore, it is considered that the Lhasa Block was an independent block between the Bangong-Nujiang Ocean and the Neotethys Ocean during the Changhsingian. This work was financially supported by Strategic Priority Research Program of Chinese Academy of Sciences and the National Natural Science Foundation of China. Reference: Feng Qiao, Hai-Peng Xu, Yi-Chun Zhang*, 2019. Changhsingian (Late Permian) foraminifers from the topmost part of the Xiala Formation in the Tsochen area, central Lhasa Block, Tibet and their geological implications. Palaeoworld, Doi: 10.1016/j.palwor.2018.10.007. Fieldwork in Tibet Foraminifers from the topmost part of the Xiala Formation (1) Foraminifers from the topmost part of the Xiala Formation (2) Distribution pattern for the fusulines Palaeofusulina and the forminifera Colaniella during the Changhsingian (Lopingian)
