Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
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EARTH SCIENCES (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted by number of followers
Nature Geoscience     Full-text available via subscription   (Followers: 164)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 151)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 145)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 145)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 134)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Marine Policy     Hybrid Journal   (Followers: 61)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 54)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
Natural Hazards     Hybrid Journal   (Followers: 53)
Journal of Earth System Science     Open Access   (Followers: 52)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 44)
Hydrological Processes     Hybrid Journal   (Followers: 44)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 41)
Geophysical Journal International     Hybrid Journal   (Followers: 40)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Groundwater     Hybrid Journal   (Followers: 37)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Geomorphology     Hybrid Journal   (Followers: 33)
Chemical Geology     Hybrid Journal   (Followers: 31)
Marine Geology     Hybrid Journal   (Followers: 31)
Geology Today     Hybrid Journal   (Followers: 31)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geology     Full-text available via subscription   (Followers: 30)
Coastal Management     Hybrid Journal   (Followers: 29)
Advances In Physics     Hybrid Journal   (Followers: 29)
GPS Solutions     Hybrid Journal   (Followers: 28)
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 26)
Landslides     Hybrid Journal   (Followers: 26)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Quaternary Science Reviews     Hybrid Journal   (Followers: 26)
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 25)
Geoforum     Hybrid Journal   (Followers: 25)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 25)
Environmental Geology     Hybrid Journal   (Followers: 25)
Tectonophysics     Hybrid Journal   (Followers: 24)
Geocarto International     Hybrid Journal   (Followers: 23)
Coral Reefs     Hybrid Journal   (Followers: 22)
Bulletin of Volcanology     Hybrid Journal   (Followers: 22)
Hydrogeology Journal     Hybrid Journal   (Followers: 21)
Hydrobiologia     Hybrid Journal   (Followers: 21)
Tellus A     Open Access   (Followers: 21)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Water Resources     Hybrid Journal   (Followers: 21)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Earthquake Spectra     Hybrid Journal   (Followers: 20)
Tellus B     Open Access   (Followers: 20)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Sedimentary Geology     Hybrid Journal   (Followers: 20)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 19)
Geophysics     Full-text available via subscription   (Followers: 19)
Quaternary Research     Full-text available via subscription   (Followers: 19)
Geological Journal     Hybrid Journal   (Followers: 19)
Global and Planetary Change     Hybrid Journal   (Followers: 18)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 17)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Geological Magazine     Hybrid Journal   (Followers: 16)
The Holocene     Hybrid Journal   (Followers: 16)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 16)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Sedimentology     Hybrid Journal   (Followers: 15)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Quaternary International     Hybrid Journal   (Followers: 14)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Pramana     Open Access   (Followers: 13)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 13)
Electromagnetics     Hybrid Journal   (Followers: 13)
Ocean Modelling     Hybrid Journal   (Followers: 12)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Frontiers of Earth Science     Hybrid Journal   (Followers: 12)
Continental Shelf Research     Hybrid Journal   (Followers: 12)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
Arctic, Antarctic, and Alpine Research     Open Access   (Followers: 12)
Pure and Applied Geophysics     Hybrid Journal   (Followers: 12)
CATENA     Hybrid Journal   (Followers: 11)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Applied Geophysics     Hybrid Journal   (Followers: 11)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Cretaceous Research     Hybrid Journal   (Followers: 10)
Earth Interactions     Open Access   (Followers: 10)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 10)
Gondwana Research     Hybrid Journal   (Followers: 10)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Journal of Seismology     Hybrid Journal   (Followers: 9)
Physik in unserer Zeit     Hybrid Journal   (Followers: 9)
Lithos     Hybrid Journal   (Followers: 9)
Limnology     Hybrid Journal   (Followers: 9)
Acta Geophysica     Hybrid Journal   (Followers: 9)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Geotectonics     Hybrid Journal   (Followers: 9)
Facies     Hybrid Journal   (Followers: 9)
Comptes Rendus : Geoscience     Open Access   (Followers: 9)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 8)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 8)
Natural Resources Research     Hybrid Journal   (Followers: 8)
Geobiology     Hybrid Journal   (Followers: 8)
Quaternary Geochronology     Hybrid Journal   (Followers: 8)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 8)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Physics of the Solid State     Hybrid Journal   (Followers: 7)
Plasma Physics Reports     Hybrid Journal   (Followers: 7)
Precambrian Research     Hybrid Journal   (Followers: 7)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Petrology     Full-text available via subscription   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 6)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Applied Ocean Research     Hybrid Journal   (Followers: 6)
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Chinese Geographical Science     Hybrid Journal   (Followers: 6)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Resource Geology     Hybrid Journal   (Followers: 6)
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
Island Arc     Hybrid Journal   (Followers: 5)
Geofluids     Open Access   (Followers: 5)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Geochemistry     Hybrid Journal   (Followers: 5)
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Zeitschrift für Geomorphologie     Full-text available via subscription   (Followers: 5)
Terra Nova     Hybrid Journal   (Followers: 5)
Energy Exploration & Exploitation     Open Access   (Followers: 4)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 3)
Surveys in Geophysics     Hybrid Journal   (Followers: 3)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Russian Geology and Geophysics     Hybrid Journal   (Followers: 3)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
JETP Letters     Hybrid Journal   (Followers: 3)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften     Full-text available via subscription   (Followers: 3)
Stratigraphy and Geological Correlation     Full-text available via subscription   (Followers: 2)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Polar Record     Hybrid Journal   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
Helgoland Marine Research     Open Access   (Followers: 2)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Studia Geophysica et Geodaetica     Hybrid Journal   (Followers: 1)
The Leading Edge     Hybrid Journal   (Followers: 1)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Doklady Physics     Hybrid Journal   (Followers: 1)
Russian Physics Journal     Hybrid Journal   (Followers: 1)
Reports on Mathematical Physics     Full-text available via subscription   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Russian Journal of Pacific Geology     Hybrid Journal  
Russian Journal of Mathematical Physics     Full-text available via subscription  
Physics of Wave Phenomena     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Moscow University Geology Bulletin     Hybrid Journal  
Marine Georesources & Geotechnology     Hybrid Journal  
Journal of Mountain Science     Hybrid Journal  
Grassland Science     Hybrid Journal  
Erwerbs-Obstbau     Hybrid Journal  
Bulletin of the Lebedev Physics Institute     Hybrid Journal  

        1 2 3 | Last

Similar Journals
Journal Cover
Newsletters on Stratigraphy
Journal Prestige (SJR): 1.647
Citation Impact (citeScore): 3
Number of Followers: 2  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0078-0421
Published by Schweizerbart Science Publishers Homepage  [23 journals]
  • High-resolution cyclochronology of the lowermost Ypresian Arnakatxa
           section (Basque-Cantabrian basin, western Pyrenees)

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      Abstract: High-resolution cyclochronology of the lowermost Ypresian Arnakatxa section (Basque-Cantabrian basin, western Pyrenees)Martínez-Braceras, Naroa; Franceschetti, Gloria; Payros, Aitor; Monechi, Simonetta; Dinarès-Turell, Jaume
      Newsletters on Stratigraphy, (2022), p. - Abstract The early Eocene paleoclimate record provides one of the best analogues for today’s global warming. In order to reconstruct the evolution of the early Eocene paleoclimate, and understand how environmental feedback mechanisms acted on it, an accurate time framework is necessary. In this regard, the astronomically calibrated time scale (ATS) provides the highest possible resolution, but models beyond 40–50 Ma are not fully resolved and actual geological data are incomplete. With the aim of filling this gap, the expanded lower Ypresian Arnakatxa section studied herein offered a potentially valuable orbitally paced geological record. This outcrop displays a well-defined arrangement of strata in couplets and bundles. The spectral analyses of colour data series showed the dominance of two main periodicities, which were related to orbital forcing on sedimentation by precession (20 ky) and short (100 ky) eccentricity cycles. Despite not being represented in the spectrograms, the influence of long (405 ky) eccentricity on sedimentation was also deduced. Moreover, the disruption of the orbital signal in the upper half of the Arnakatxa section correlates with a very long (2.4 Myr) eccentricity node centred at ~54.6 Ma, which could also have caused the amplification of the orbital signal related to obliquity (41 ky). Taking everything into account, the cyclostratigraphic analyses carried out in Arnakatxa resulted in a precessional scale orbital chronology for the time interval between 55.805 and 54.435 Ma (duration of 1.37 Myr). Thus, the Arnakatxa succession could be reliably correlated with Atlantic ODP records, which are the main reference for Ypresian astrochronology, at precessional scale. Furthermore, the results from Arnakatxa also help to identify the astronomical solutions that better match actual geological data, contributing to the construction of a definitive Ypresian ATS. In this regard, the Arnakatxa results are not a good fit for solutions La10a, La10d, La11 and ZB18a, but match well with the previously thought to be less reliable solutions La10b and La10c.
      PubDate: Wed, 13 Apr 2022 00:00:00 +000
       
  • From Neo-Tethyan convergence to India-Asia collision: radiolarian
           

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      Abstract: From Neo-Tethyan convergence to India-Asia collision: radiolarian biostratigraphy of the Cretaceous to Paleocene deep-water Tethys HimalayaLi, Xin; Hu, Xiumian; An, Wei; Liu, Qun; Garzanti, Eduardo; Meng, Jun
      Newsletters on Stratigraphy, (2022), p. - Abstract Deep-water strata preserved in the distal northern Indian margin record the evolution of the Neotethys Ocean before and during the India-Asia initial collision. These strata are however difficult to date precisely as radiolarian are the only fossils present. We here revise the Cretaceous to Paleocene stratigraphy of deep-water sediments deposited in the distal part of the Indian passive margin, located just south of the Yarlung–Tsangpo suture zone near Saga. Four radiolarian assemblages are illustrated and correlated to the Cecrops septemporatus zone to Aurisaturnalis carinatus zone (late Valanginian to Barremian), the Turbocapsula costata zone (Aptian), the Spoletoensis zone (Albian), and the RP6a subzone (lower Selandian). Four units deposited from the Early Cretaceous to the Paleocene are thus identified (bottom to top): Rilang, Duobeng, Chuangde, and Sangdanlin formations. Such a revised stratigraphic scheme allows correlation with the sedimentary successions exposed in the Gyangze and Zhongba areas. Stratigraphic correlation proves that Indian-derived sandstones below the India to Asia provenance reversal (IAPR) were deposited on the Indian passive margin rather than on Neotethys oceanic crust. Sand injection complex preserved in the lower part of the deep-water sediments is related to extensional tectonics associated with Lower Cretaceous volcanism documented all along the northern margin of India. This study provides a much improved framework to interpret the geological evolution of the deep-water edge of the northern Indian margin during progressive closure of the Neotethys Ocean culminated with the onset of the India-Asia collision.
      PubDate: Wed, 06 Apr 2022 00:00:00 +000
       
  • A new age model and chemostratigraphic framework for the Maastrichtian
           type area (southeastern Netherlands, northeastern Belgium)

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      Abstract: A new age model and chemostratigraphic framework for the Maastrichtian type area (southeastern Netherlands, northeastern Belgium)Vellekoop, Johan; Kaskes, Pim; Sinnesael, Matthias; Huygh, Jarno; Déhais, Thomas; Jagt, John W.M.; Speijer, Robert P.; Claeys, Philippe
      Newsletters on Stratigraphy, (2022), p. - Abstract The youngest time interval of the Cretaceous Period is known as the Maastrichtian, in reference to the shallow-marine strata outcropping in the area surrounding the city of Maastricht, in the Netherlands-Belgium border region. While the type-Maastrichtian strata have yielded a wealth of paleontological data, comparatively little geochemical work has so far been carried out on this succession. To date, age assessment of the type-Maastrichtian, and stratigraphic correlation with sections elsewhere, have largely been based on biostratigraphy and preliminary attempts at cyclostratigraphy. However, these techniques are hampered by bio-provincialism and the presence of stratigraphic gaps in the succession, respectively. In recent years, stable carbon isotope stratigraphy has proven to be a powerful tool for correlating Upper Cretaceous strata on a global scale. When integrated with biostratigraphy, carbon isotope stratigraphy can be used to test the synchroneity of biological and climatic events across the globe and to reconcile inter-regional biostratigraphic schemes. Therefore, we have generated the first high-resolution bulk stable carbon isotope stratigraphy for the type-Maastrichtian, using an extensive sample set acquired within the context of the Maastrichtian Geoheritage Project spanning approximately 100 meters of stratigraphy at the Hallembaye and former ENCI quarries. In combination with bulk major and trace element data generated using µXRF, this record presents the first high-resolution chemostratigraphic survey for the type-Maastrichtian. The µXRF-based element profiles through the type-Maastrichtian succession reveal variable fluxes of terrigenous input into this carbonate system over time, marking three distinct stratigraphic sequences, separated by sequence boundaries at the Froidmont, Lichtenberg and Vroenhoven horizons. In addition, the carbon isotope profile records the Campanian–Maastrichtian Boundary Event (CMBE) and the Mid-Maastrichtian Event (MME) in the Maastrichtian type area for the first time. Our refined age model allows for global correlation between the type-Maastrichtian sequence and Maastrichtian successions worldwide and places the abundant paleontological records from the type-Maastrichtian in a global context.
      PubDate: Wed, 16 Mar 2022 00:00:00 +000
       
  • Rolling back the ‘mudstone blanket’: complex geometric and facies
           responses to basin architecture in the epicontinental Oxford Clay
           Formation (Jurassic, UK)

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      Abstract: Rolling back the ‘mudstone blanket’: complex geometric and facies responses to basin architecture in the epicontinental Oxford Clay Formation (Jurassic, UK)Woods, Mark A.; Hennissen, Jan A.I.; Newell, Andrew J.; Duff, Keith L.; Wilby, Philip R.
      Newsletters on Stratigraphy, (2022), p. - Abstract Facies variability of mudstones is likely greater than generally perceived, with important implications for their behaviour in major civil engineering, energy and waste disposal applications. Here, we explore this variability for the UK Oxford Clay, a widely studied Middle/Upper Jurassic mudstone. Evidence from wire-line logs, geochemistry, sequence stratigraphy and biofacies analyses are combined to reveal heterogeneity within the Peterborough Member (Lower Oxford Clay) and to explore the extent to which it blanketed basin features or responded dynamically to them. Thickness modelling suggests that the Mid North Sea High, formed by Mid Jurassic thermal doming, likely influenced sediment pathways, favouring thick sediment accumulation in the Wessex Basin, thinner successions across the East Midlands Shelf, and sediment starvation in the Weald Basin. Biofacies patterns, determined using a novel combination of detrended correspondence and cluster analysis, vary significantly and suggest a complex patchwork of environments related to local basin setting. The Type Section of the Peterborough Member seems to represent only a narrow range of conditions that influenced its deposition, and cautions against developing basin-scale models based on a few well exposed and heavily researched outcrop successions.
      PubDate: Wed, 16 Mar 2022 00:00:00 +000
       
  • Comment on “Yin, J. (2022), A revision and new data on the Jurassic
           ammonites from the Biluoco area, southern Qiangtang block (North Tibet)”
           

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      Abstract: Comment on “Yin, J. (2022), A revision and new data on the Jurassic ammonites from the Biluoco area, southern Qiangtang block (North Tibet)”Fu, Xiugen; Nie, Ying; Hu, Zhifang
      Newsletters on Stratigraphy, (2022), p. - Abstract Yin (Newsletters on Stratigraphy, 2022, 55, 1–19) has suggested that there is no evidence of the Toarcian Oceanic Anoxic Event (T-OAE) in terms of organic-rich shales in the Qiangtang region, northern Tibet based on a revision data on the Jurassic ammonites from the Biluoco area. However, He used some unbelievable ammonites to determine the depositional age of the Biluoco section, and failed to constrain the age of T-OAE interval. Our data suggest that the T-OAE was extensive in the Qiangtang Basin supporting a global event. We also revised wrong information of strata in the Biluoco area in Yin (Newsletters on Stratigraphy, 2022, 55, 1–19).
      PubDate: Wed, 16 Mar 2022 00:00:00 +000
       
  • High-resolution upper Maastrichtian carbon isotope stratigraphy of
           terrestrial organic matter from northern Japan

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      Abstract: High-resolution upper Maastrichtian carbon isotope stratigraphy of terrestrial organic matter from northern JapanNifuku, Ko; Naruse, Hajime; Ikehara, Minoru
      Newsletters on Stratigraphy, (2022), p. 137 - 157Abstract High-resolution stable carbon isotope stratigraphy of terrestrial organic matter was established for the upper Maastrichtian Senpohshi Formation of the Nemuro Group in eastern Hokkaido, northern Japan. The Senpohshi Formation, approximately 1,300 m thick, is dominated by hemipelagic mudstone deposited along an active margin in the North Pacific region. Microscopic observations of extracted kerogen samples from the formation revealed the presence of sedimentary organic matter (SOM), predominantly phytoclasts and a minor amount of non-fluorescent amorphous organic matter, indicating material of a terrestrial higher plant origin. The atomic hydrogen/carbon ratios of the kerogen samples indicated a coalification rank at the anthracite stage or below. Therefore, the stable carbon isotope values of the bulk SOM obtained for the Senpohshi Formation represent the unmodified, original values of terrestrial organic matter. The stable carbon isotope profile reconstructed for the formation provides the first high-resolution terrestrial record of the Mid-Maastrichtian Event (MME), which is comparable to high-resolution marine carbon isotope data from other sections. The carbon isotopic signatures defined by the marine records are recognized in the terrestrial data from the formation, especially in middle to upper part of the event. However, the terrestrial record showed a discrepancy from the marine data in the lower part of the MME, suggesting local variation of the hinterland environment in the North Pacific region. This study provides new insight into environmental changes during the late Maastrichtian by establishing a detailed carbon isotope record of terrestrial materials.
      PubDate: Tue, 15 Mar 2022 00:00:00 +000
       
  • Foraminifers in the Holkerian Stratotype, regional substage in Britain:
           key taxa for the Viséan subdivision

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      Abstract: Foraminifers in the Holkerian Stratotype, regional substage in Britain: key taxa for the Viséan subdivisionCózar, Pedro; Somerville, Ian D.; Hounslow, Mark W.
      Newsletters on Stratigraphy, (2022), p. 159 - 172Abstract Foraminiferal revision of the Holkerian Stratotype of Britain at Barker Scar, Holker Hall, south Cumbria, UK, allows the subdivision of the section into the Cf4δ, Cf5α and Cf5β subzones (the latter being further subdivided into lower Cf5β1 and upper Cf5β2 intervals). The base of Cf5α subzone at the base of bed C and base of Cf5β subzone from the middle part of bed C, occur at 14 m and 10.5 m, respectively, below the traditional basal boundary of the Holkerian at bed K. The lower boundaries of these foraminiferal subzones occur within the main interval affected by dolomitization in the section, which poses problems in defining precisely the bases for these subzones. Nevertheless, in spite of the dolomitization, a more or less continuous foraminiferal record allows a solid correlation of the base of the Cf5β with the preserved succession in the Livian Substage (defined in Belgium, but also used in France), and it is assumed that the base of this substage should correspond to the base of the Cf5α subzone. The base of the Cf5α subzone can be correlated with the base of the Russian Tulian Substage, since it contains many taxa in common with the Holkerian. However, further investigation is needed to establish other levels of correlation (e.g., base of the Cf5β subzone) higher up in the Holkerian substage. All of these problems suggest that the Holkerian, as it is currently recognised, and the Barker Scar stratotype section, in particular, should be reconsidered, and a new para-stratotype section, ideally devoid of dolomitization, should be located and investigated, in order to corroborate the occurrence of the Cf5α and Cf5β foraminiferal subzones compared to those recognised in the Barker Scar Stratotype. These modifications would allow identification of an apparent synchronous faunal event forming the basis of a future subdivision of the Viséan.
      PubDate: Tue, 15 Mar 2022 00:00:00 +000
       
  • Bio- and chemostratigraphy of the Posidonia Shale: a new database for the
           Toarcian Oceanic Anoxic Event from northern Germany

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      Abstract: Bio- and chemostratigraphy of the Posidonia Shale: a new database for the Toarcian Oceanic Anoxic Event from northern GermanyVisentin, Stefano; Erba, Elisabetta; Mutterlose, Jörg
      Newsletters on Stratigraphy, (2022), p. 173 - 198Abstract We present calcareous nannofossil biostratigraphy, calcium carbonate and organic carbon isotope data of two cores drilled in the North German Basin (northern Germany) covering the upper part of the Amaltheenton-Formation (Fm) (upper Pliensbachian) and the Posidonienschiefer-Fm. (Toarcian). Fourteen bioevents spanning the latest Pliensbachian to late Toarcian time interval allowed the identification of the NJ5, NJ6 and NJ7 Zones of the Boreal biozonation. The early Toarcian Oceanic Anoxic Event (T-OAE), identified by the organic carbon isotopic excursion within the Posidonienschiefer-Fm., is constrained by the first occurrences (FOs) of Carinolithus superbus crassus and Diductius constans at the onset of the δ13C anomaly. The last occurrences (LOs) of the nannofossil species Crepidolithus granulatus, Parhabdolithus liasicus distinctus, Biscutum finchii and Biscutum grande are detected within the δ13C isotopic anomaly. The new biostratigraphic data acquired in the North German Basin are compared to data from sections at higher and lower latitudes to evaluate event reproducibility relative to the δ13Corg isotope curve. The FO of C. superbus crassus is an excellent datum to constrain the onset of the T-OAE at supraregional – global scale. Our finding indicates further nannofossil biohorizons within the T-OAE that might be useful at regional scale.
      PubDate: Tue, 15 Mar 2022 00:00:00 +000
       
  • Barremian–early Aptian charophyte biostratigraphy revisited

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      Abstract: Barremian–early Aptian charophyte biostratigraphy revisitedPérez-Cano, Jordi; Bover-Arnal, Telm; Martín-Closas, Carles
      Newsletters on Stratigraphy, (2022), p. 199 - 230Abstract New Barremian–early Aptian charophyte biozonations are proposed here based on the charophyte succession in the Maestrat Basin (Iberian Chain, Spain). Biostratigraphic analysis distinguished two biozonations, European and Eurasian, which were compared to establish correlations. This is the first time that Early Cretaceous charophyte biozones are calibrated by means of strontium-isotope stratigraphy, enabling their correlation with the coeval marine realm (ammonite biostratigraphy). The European charophyte biozonation is formed of two partial range biozones, whose index species were endemic from the Cretaceous Tethyan Archipelago (present-day Europe and Northern Africa): (1) Globator maillardii var. trochiliscoides (early Barremian) and (2) Ascidiella cruciata-Pseudoglobator paucibracteatus. The base of the A. cruciata-P. paucibracteatus biozone was calibrated with an oyster shell sample whose 87Sr/86Sr is 0.707482, translating to a late early Barremian age. The total time span of this latter biozone is late early Barremian–early Aptian. The Eurasian biozonation involves a novel Lower Cretaceous charophyte biostratigraphy. It has more resolution than the European biozonation, as it is composed of three partial range biozones whose index species were well-distributed in Eurasia. From oldest to youngest these are: (1) Atopochara trivolvis var. triquetra, (2) Hemiclavator neimongolensis var. neimongolensis, and (3) Clavator grovesii var. jiuquanensis. The A. trivolvis var. triquetra biozone characterises the early Barremian, being almost equivalent to the European G. maillardii var. trochiliscoides biozone. The base of the H. neimongolensis var. neimongolensis biozone is marked by the first appearance datum (FAD) of Hemiclavator neimongolensis var. neimongolensis and was calibrated with an oyster shell whose 87Sr/86Sr is 0.707481 corresponding to a late early Barremian age. The top of the H. neimongolensis var. neimongolensis biozone coincides with the FAD of Clavator grovesii var. jiuquanensis. The base of the C. grovesii var. jiuquanensis biozone was dated with an oyster sample sample collected 25 m below the FAD of C. grovesii var. jiuquanensis. The 87Sr/86Sr value of this sample is 0.707489, which translates into an early late Barremian age. Thus, the H. neimongolensis var. neimongolensis biozone spans the late early Barremian–early late Barremian interval. The top of the Clavator grovesii var. jiuquanensis biozone (late Barremian–early Aptian) is marked by the FAD of Clavator grovesii var. lusitanicus. The newly proposed Eurasian charophyte biozonation will facilitate the correlation between non-marine basins in one of the largest continental areas on Earth.
      PubDate: Tue, 15 Mar 2022 00:00:00 +000
       
  • Condensation and channelling in Cenomanian chalks of the northern
           Anglo-Paris Basin; The Totternhoe Stone and related deposits

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      Abstract: Condensation and channelling in Cenomanian chalks of the northern Anglo-Paris Basin; The Totternhoe Stone and related depositsGale, Andy; Kennedy, Jim
      Newsletters on Stratigraphy, (2022), p. 231 - 254Abstract The Totternhoe Stone is a condensed, intraclastic unit developed in the Transitional and Northern Provinces of the English Cenomanian chalk, and rests on an erosional surface cut into chalk of the Mantelliceras dixoni Zone, locally downcutting into the underlying M. mantelli Zone in channels. The age of the chalk beneath this surface has been determined from the distribution of calcitic macrofossils with restricted ranges, known in detail from the basinal succession in southern England. The channels, up to 20 m deep, locally have a NNW–SSE orientation and are interpreted to have been formed by strengthened bottom currents which developed subsequent to a major sea-level fall of late M. dixoni age. The Totternhoe Stone is a complex condensed deposit of Cunningtoniceras inerme and Acanthoceras rhotomagense Zone age, composed of calcarenite formed largely of inoceramid prisms; it includes both remanié and indigenous faunas, and displays significant lateral variation in age. The Totternhoe Stone thickens into the channels (up to 10 m) and locally provided an important building stone. The Totternhoe Stone was deposited during the major transgression of the early Middle Cenomanian, and is correlative with the Basement Bed of the chalk of the eastern part of Dorset. A higher sequence, of Acanthoceras jukesbrownei Zone age, saw a smaller sea level fall, and also generated an erosional surface across the Transitional and Northern Provinces. Shallow channels were formed over the sites of those previously developed beneath the Totternhoe Stone, and these were infilled with calcisphere-rich calcarenites during the subsequent transgression, during which the Nettleton Stone was deposited across the region. This A. jukesbrownei Zone transgression onlapped the A. rhotomagense Zone in Dorset to rest on the Albian. The Totternhoe Stone and subjacent erosional surface are local expressions of a global regressive:transgressive cycle which probably had a glacioeustatic cause.
      PubDate: Tue, 15 Mar 2022 00:00:00 +000
       
 
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