This file was created by the TYPO3 extension publications --- Timezone: CEST Creation date: 2026-05-31 Creation time: 09:10:11 --- Number of references 35 article Hudson202543 Article 2025 10.7306/VJ.23.2 Volumina Jurassica 23 43 – 64 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105016377141&doi=10.7306%2fVJ.23.2&partnerID=40&md5=09f76593eb4894c2c5463a8537092c80 Cited by: 0 Alexander J.L. Hudson Stephen P. Hesselbo Linda A. Hinnov Kate Littler Kevin N. Page James B. Riding Micha Ruhl Clemens V. Ullmann article Wang2025 Article 2025 10.1029/2024JD043219 Journal of Geophysical Research: Atmospheres 130 12 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105009277149&doi=10.1029%2f2024JD043219&partnerID=40&md5=9284121b3a2536ec704a93a19112e861 Cited by: 1; All Open Access, Bronze Open Access Yan Wang Micha Ruhl Jian Cao Wenxuan Hu Dongming Zhi Yong Tang Jinchao Liu article leu2024 2024 07 10.1127/nos/2024/0803 Newsletters on Stratigraphy 57 Schweizerbart Science Publishers

Stuttgart, Germany

257-282 3 http://dx.doi.org/10.1127/nos/2024/0803 Katharina Leu Christian Zeeden Arne Ulfers Mehrdad Sardar Abadi Mathias Vinnepand Micha Ruhl Stephen Hesselbo Thomas Wonik article Pieńkowski2024 The Cardigan Bay Basin (UK) may have functioned as a deep and narrow strait, and thereby influenced Early Jurassic oceanic circulation through the northern and southern Laurasian Seaway, and between Boreal and Peri-Tethys domains. Toarcian hemipelagic deposits of the basin in the Mochras borehole show strongly bioturbated contourite facies. Trace fossils are strongly dominated by Phycosiphon incertum (represented by four morphotypes), which was produced by opportunistic colonizers. Thalassinoides, Schaubcylindrichnus and Trichichnus are common (the latter is a deep-tier trace fossil produced by filamentous sulfide-oxidizing bacteria with a high tolerance for dysoxia), accompanied by less common Zoophycos, Planolites, Palaeophycus, Teichichnus, Rhizocorallium, Chondrites, and dwelling and resting structures, such as cf. Polykladichnus, Siphonichnus, Skolithos, Arenicolites, Monocraterion and Lockeia. Ichnological and lithological signals suggest repetitive fluctuations in benthic conditions attributed to a hierarchy of orbital cycles (precession and obliquity [4th order], short eccentricity [3rd order], long eccentricity [2nd order] and Earth–Mars secular resonance [1st order]). The Pliensbachian–Toarcian transition appears to be a significant palaeoceanographic turning point in the Cardigan Bay Basin, starting a CaCO3 decline, and with the most severe oxygen crisis of the Tenuicostatum Zone (here dysoxic but not anoxic) ending at the onset, in the early Serpentinum Zone (Exaratum Subzone), of the Toarcian negative carbon isotope excursion (To-CIE—linked with the Toarcian Oceanic Anoxic Event occurring in the lower part in the Serpentinum Zone). This trend contrasts with the prevalence of anoxia synchronous with the To-CIE in many other settings. Minor dysoxia returned to the Mochras setting in the latest Thouarsense to Dispansum zone interval. Extreme climate warming during the To-CIE may have enhanced and caused a reversal in the direction of deep marine circulation, improving oxygenation of the sea floor. Spectral analysis of binary data on ichnotaxa appearances gives high confidence in orbital signals and allows refined estimation of ammonite zones and the duration of the Toarcian (minimum ~ 9.4 Myr). (Figure presented.) © The Author(s) 2024. Article 2024 10.1186/s40645-024-00612-3 Progress in Earth and Planetary Science 11 Springer Science and Business Media Deutschland GmbH 1 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188924463&doi=10.1186%2fs40645-024-00612-3&partnerID=40&md5=610c50abccae5af0603c1a98fdc4ed4b Cited by: 6; All Open Access, Gold Open Access, Green Open Access Grzegorz Pieńkowski Alfred Uchman Krzysztof Ninard Kevin N. Page Stephen P. Hesselbo article Ninard202425 Article 2024 10.7306/VJ.22.3 Volumina Jurassica 22 25 – 34 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105004006293&doi=10.7306%2fVJ.22.3&partnerID=40&md5=d6a0057ce7737f0443666216b390caf5 Cited by: 0; All Open Access, Green Open Access Krzysztof Ninard Alfred Uchman Grzegorz Pieńkowski Stephen P. Hesselbo article Zhang2024 Article 2024 10.1016/j.palaeo.2024.112214 Palaeogeography, Palaeoclimatology, Palaeoecology 647 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85192315585&doi=10.1016%2fj.palaeo.2024.112214&partnerID=40&md5=325142193f76767b3865d719c95143bb Cited by: 3 Li Zhang Yongdong Wang Micha Ruhl Emma Blanka Kovács Yuanyuan Xu Yanbin Zhu Ning Lu Hongyu Chen article Hollaar20242795 Present-day fire frequency is related to a productivity-aridity gradient on regional and global scales. Optimum fire conditions occur at times of intermediate productivity and aridity, whereas fire is limited at the high productivity (moisture) and aridity (no fuel) endmembers. However, the current global fire activity pattern is reinforced by the predominant burning of grasslands. Here we test the intermediate fire-productivity hypothesis for a period on Earth before the evolution of grasses, the Early Jurassic, and explore the fire regime of two contrasting climatic states: the cooling of the Late Pliensbachian Event (LPE) and the warming of the Sinemurian-Pliensbachian Boundary (SPB). Palaeo-fire records are reconstructed from fossil charcoal abundance, and changes in the hydrological cycle are tracked via clay mineralogy, which allows inference of changes in fuel moisture status. Large fluctuations in the fossil charcoal on an eccentricity timescale indicate two modes of fire regime at the time. Wildfires were moisture-limited in a high-productivity ecosystem during eccentricity minima for both the SPB and the LPE. During eccentricity maxima fires increased, and an optimum fire window was reached, in which periodically greater seasonality in rainfall and temperatures led to intermediate states of productivity and aridity. The LPE experienced more extreme climatic endmembers compared to the SPB, with the fire regime edging closer to "moisture limitation"during eccentricity minima, and experienced more pronounced seasonality during eccentricity maxima, explained by the overall cooler climate at the time. This study illustrates that the intermediate-productivity gradient holds up during two contrasting climatic states in the Jurassic. © 2024 Copernicus Publications. All rights reserved. Article 2024 10.5194/bg-21-2795-2024 Biogeosciences 21 Copernicus Publications 2795 – 2809 11 aridity; grass; grassland; Jurassic; paleoecology; paleoenvironment; rainfall; seasonality; wildfire https://www.scopus.com/inward/record.uri?eid=2-s2.0-85196197724&doi=10.5194%2fbg-21-2795-2024&partnerID=40&md5=e9474fdfdb733225879ac7634a072059 Cited by: 0 Teuntje P. Hollaar Claire M. Belcher Micha Ruhl Jean-François Deconinck Stephen P. Hesselbo article Lodowski202487 Article 2024 10.7306/VJ.22.6 Volumina Jurassica 22 87 – 116 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105006886593&doi=10.7306%2fVJ.22.6&partnerID=40&md5=a42ebfc658ec5c0a3cad564aa6e868ff Cited by: 0 Damian G. Lodowski Mathieu Martinez Stephen P. Hesselbo Marta Hodbod Melanie J. Leng Grzegorz Pieńkowski Paweł Brański Robyn Pointer article Hollaar2023979 The Late Pliensbachian Event (LPE), in the Early Jurassic, is associated with a perturbation in the global carbon cycle (positive carbon isotope excursion (CIE) of ∼2‰), cooling of ∼5C, and the deposition of widespread regressive facies. Cooling during the late Pliensbachian has been linked to enhanced organic matter burial and/or disruption of thermohaline ocean circulation due to a sea level lowstand of at least regional extent. Orbital forcing had a strong influence on the Pliensbachian environments and recent studies show that the terrestrial realm and the marine realm in and around the Cardigan Bay Basin, UK, were strongly influenced by orbital climate forcing. In the present study we build on the previously published data for long eccentricity cycle E459±1 and extend the palaeoenvironmental record to include E458±1. We explore the environmental and depositional changes on orbital timescales for the Llanbedr (Mochras Farm) core during the onset of the LPE. Clay mineralogy, X-ray fluorescence (XRF) elemental analysis, isotope ratio mass spectrometry, and palynology are combined to resolve systematic changes in erosion, weathering, fire, grain size, and riverine influx. Our results indicate distinctively different environments before and after the onset of the LPE positive CIE and show increased physical erosion relative to chemical weathering. We also identify five swings in the climate, in tandem with the 405kyr eccentricity minima and maxima. Eccentricity maxima are linked to precessionally repeated occurrences of a semi-arid monsoonal climate with high fire activity and relatively coarser sediment from terrestrial runoff. In contrast, 405kyr minima in the Mochras core are linked to a more persistent, annually wet climate, low fire activity, and relatively finer-grained deposits across multiple precession cycles. The onset of the LPE positive CIE did not impact the expression of the 405kyr cycle in the proxy records; however, during the second pulse of heavier carbon (13C) enrichment, the clay minerals record a change from dominant chemical weathering to dominant physical erosion. © 2023 Teuntje P. Hollaar et al. Article 2023 10.5194/cp-19-979-2023 Climate of the Past 19 Copernicus Publications 979 – 997 5 Cardigan Bay; United Kingdom; Wales; carbon cycle; chemical weathering; climate forcing; environmental change; orbital forcing; organic matter; paleoenvironment; palynology; Pliensbachian; thermohaline circulation https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160956356&doi=10.5194%2fcp-19-979-2023&partnerID=40&md5=fb54a3176859845c384a8a079b2eb9e6 Cited by: 5; All Open Access, Gold Open Access, Green Open Access Teuntje P. Hollaar Stephen P. Hesselbo Jean-François Deconinck Magret Damaschke Clemens V. Ullmann Mengjie Jiang Claire M. Belcher article WOS:001126644000001 2023 10.1111/pala.12684 PALAEONTOLOGY 66 Ginkgo; epidermal cell; micro-character; machine learning; palaeoclimate parameter Li Zhang Yongdong Wang Micha Ruhl Yuanyuan Xu Yanbin Zhu Pengcheng An Hongyu Chen Defei Yan article Paulsen2023 Article 2023 10.1002/spp2.1489 Papers in Palaeontology 9 2 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85153760457&doi=10.1002%2fspp2.1489&partnerID=40&md5=0803202743c4d4224dc5e30897511b8c Cited by: 3; All Open Access, Hybrid Gold Open Access Maria Paulsen Nicolas Thibault article WOS:000965176200001 2023 10.1016/j.gloplacha.2023.104058 GLOBAL AND PLANETARY CHANGE 222 Mesozoic -Paleogene; Hyperthermal events; Climate change; Paleoenvironment Tianchen He David B. Kemp Juan Li Micha Ruhl article Zhang2023 Article 2023 10.1016/j.cretres.2023.105543 Cretaceous Research 149 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85158838254&doi=10.1016%2fj.cretres.2023.105543&partnerID=40&md5=d631ee24f213b511bef16d2dbabe7bb5 Cited by: 3 Li Zhang Yongdong Wang Micha Ruhl Yanbin Zhu Haijun Li article WOS:000904613800008 2023 10.1016/j.epsl.2022.117959 EARTH AND PLANETARY SCIENCE LETTERS 602 Wenhan Chen David B. Kemp Tianchen He Robert J. Newton Yijun Xiong Hugh C. Jenkyns Kentaro Izumi Tenichi Cho Chunju Huang Simon W. Poulton article Damaschke202377 Article 2023 10.1144/SP527-2022-58 Geological Society Special Publication 527 77 – 94 1 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85178654829&doi=10.1144%2fSP527-2022-58&partnerID=40&md5=b8d4c92d7f509d3e950336102cc2c832 Cited by: 8; All Open Access, Hybrid Gold Open Access M. Damaschke M.W. Fellgett M.P.A. Howe C.J. Watson article sd-32-1-2023 2023 10.5194/sd-32-1-2023 Scientific Drilling 32 1--25 S. P. Hesselbo A. Al-Suwaidi S. J. Baker G. Ballabio C. M. Belcher A. Bond I. Boomer R. Bos C. J. Bjerrum K. Bogus R. Boyle J. V. Browning A. R. Butcher D. J. Condon P. Copestake S. Daines C. Dalby M. Damaschke S. E. Damborenea J.-F. Deconinck A. J. Dickson I. M. Fendley C. P. Fox A. Fraguas J. Frieling T. A. Gibson T. He K. Hickey L. A. Hinnov T. P. Hollaar C. Huang A. J. L. Hudson H. C. Jenkyns E. Idiz M. Jiang W. Krijgsman C. Korte M. J. Leng T. M. Lenton K. Leu C. T. S. Little C. MacNiocaill M. O. Mance\~nido T. A. Mather E. Mattioli K. G. Miller R. J. Newton K. N. Page J. P\'alfy G. Pie\'nkowski R. J. Porter S. W. Poulton A. C. Riccardi J. B. Riding A. Roper M. Ruhl R. L. Silva M. S. Storm G. Suan D. Szűcs N. Thibault A. Uchman J. N. Stanley C. V. Ullmann B. Schootbrugge M. L. Vickers S. Wadas J. H. Whiteside P. B. Wignall T. Wonik W. Xu C. Zeeden K. Zhao article WOS:000853336000003 2022 10.1016/j.gloplacha.2022.103884 GLOBAL AND PLANETARY CHANGE 215 Early Toarcian; Panthalassic Ocean; Sulfur cycle; Pyrite sulfur isotope; Local sedimentary environment Wenhan Chen David B. Kemp Robert J. Newton Tianchen He Chunju Huang Tenichi Cho Kentaro Izumi article WOS:000911968500013 2022 10.1126/sciadv.abo0866 SCIENCE ADVANCES 8 Micha Ruhl Stephen P. Hesselbo Hugh C. Jenkyns Weimu Xu Ricardo L. Silva Kara J. Matthews Tamsin A. Mather Conall Mac Niocaill James B. Riding article Pacyna2022 Article 2022 10.7306/gq.1660 Geological Quarterly 66 3 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85141794975&doi=10.7306%2fgq.1660&partnerID=40&md5=78e0ce2a705cfbf8c9ebbd8334adc356 Cited by: 6; All Open Access, Gold Open Access, Green Open Access Grzegorz Pacyna Jadwiga Ziaja Maria Barbacka Grzegorz Pieńkowski Agata Jarzynka Grzegorz Niedźwiedzki article Ullmann2022 The Llanbedr (Mochras Farm) core (Wales, UK) yielded a >1300 m long mudrock sequence that has excellent potential for establishing an integrated stratigraphic scheme for the entire Early Jurassic Epoch. Lithological variations in the core are predominantly driven by hierarchical changes in the carbonate content. These changes also dominate – or may impact upon – many geochemical and physical properties of the core. The bulk carbonate C isotope record displays systematic fluctuations, the largest of which correspond to previously identified phases of environmental perturbation. The magnitudes of negative C isotope excursions in carbonate are inflated compared with equivalents previously described elsewhere as a result of diagenesis and the concomitant loss of primary carbonate. The marine macrofossil record of Mochras reveals biological and isotopic patterns that are generally comparable with other UK basins. Potentially significant differences between the Cleveland and Cardigan Bay basins are observed in the Pliensbachian and Toarcian fossils. This different expression may be related to different habitat structures or palaeoceanographic and water depth differences between these basins. Minima in macrofossil δ18 O values generally coincide with peaks in macrofossil wood abundance and sea-level lowstands inferred from sequence stratigraphic interpretation of other UK sections. This relationship suggests a possible relative sea-level control on the observed O isotope records and sediment provenance. © 2021 The Author(s). Article 2022 English 00167649 10.1144/jgs2021-018 Journal of the Geological Society 179 Geological Society of London 1 Cardigan Bay; United Kingdom; Wales; Binary alloys; Calcite; Geochemistry; Infill drilling; Isotopes; Lithology; Sea level; Stratigraphy; Bulk carbonates; Bulk rocks; Carbonate content; Drill core; Early Jurassic; Early Jurassic Epoch; Geochemicals; Isotope record; Macrofossils; Mudrocks; calcite; depositional environment; fossil; geochemistry; Jurassic; mudstone; sequence stratigraphy; Carbonation https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116887216&doi=10.1144%2fjgs2021-018&partnerID=40&md5=1c7b0506dfcea2e44da5ff2e5c99007c Cited by: 2; All Open Access, Green Open Access, Hybrid Gold Open Access Clemens V. Ullmann Dominika Szűcs Mengjie Jiang Alexander J.L. Hudson Stephen P. Hesselbo article Barbacka2022 Article 2022 10.1002/spp2.1425 Papers in Palaeontology 8 2 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128716742&doi=10.1002%2fspp2.1425&partnerID=40&md5=cc6c8df8d49566dd1b55395802ef4bd1 Cited by: 8; All Open Access, Green Open Access Maria Barbacka Artur Górecki Grzegorz Pacyna Grzegorz Pieńkowski Marc Philippe Károly Bóka Jadwiga Ziaja Agata Jarzynka Martin Qvarnström Grzegorz Niedźwiedzki article Pieńkowski2021 Article 2021 10.1016/j.gloplacha.2021.103648 Global and Planetary Change 207 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116900018&doi=10.1016%2fj.gloplacha.2021.103648&partnerID=40&md5=d54ba925e33a113f7f1d4105e2e1dcc5 Cited by: 17; All Open Access, Green Open Access Grzegorz Pieńkowski Alfred Uchman Krzysztof Ninard Stephen P. Hesselbo article Hollaar2021 Article 2021 10.1038/s43247-021-00307-3 Communications Earth and Environment 2 1 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130219929&doi=10.1038%2fs43247-021-00307-3&partnerID=40&md5=0171974f519e118fd33112d8a440121a Cited by: 28; All Open Access, Gold Open Access, Green Open Access Teuntje P. Hollaar Sarah J. Baker Stephen P. Hesselbo Jean-François Deconinck Luke Mander Micha Ruhl Claire M. Belcher article Pieńkowski2020 Review 2020 10.1016/j.earscirev.2020.103383 Earth-Science Reviews 210 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85092530913&doi=10.1016%2fj.earscirev.2020.103383&partnerID=40&md5=8aca6c4b9e05684a972dedc167c38f51 Cited by: 26; All Open Access, Green Open Access, Hybrid Gold Open Access Grzegorz Pieńkowski Stephen P. Hesselbo Maria Barbacka Melanie J. Leng article Ruebsam2020 Article 2020 10.1016/j.epsl.2020.116417 Earth and Planetary Science Letters 546 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087328494&doi=10.1016%2fj.epsl.2020.116417&partnerID=40&md5=0fab3e07acb09e677790a8c338006b3a Cited by: 32 Wolfgang Ruebsam Grzegorz Pieńkowski Lorenz Schwark article Pieńkowski2019449 Article 2019 10.7306/gq.1480 Geological Quarterly 63 449 – 459 3 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075082891&doi=10.7306%2fgq.1480&partnerID=40&md5=b545a068672f5f95c106af7373a08b31 Cited by: 1; All Open Access, Gold Open Access Grzegorz Pieńkowski Michelangelo Martini Mildred Zepeda-Martínez article Deconinck20192769 Article 2019 10.1111/sed.12610 Sedimentology 66 2769 – 2783 7 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067349190&doi=10.1111%2fsed.12610&partnerID=40&md5=5d47b6ff4dac8df4ac2ef79c8c0f258e Cited by: 42; All Open Access, Green Open Access, Hybrid Gold Open Access Jean-François Deconinck Stephen P. Hesselbo Pierre Pellenard article Xu2018396 The late Early Jurassic Toarcian Stage represents the warmest interval of the Jurassic Period, with an abrupt rise in global temperatures of up to ∼7 °C in mid-latitudes at the onset of the early Toarcian Oceanic Anoxic Event (T-OAE; ∼183 Ma). The T-OAE, which has been extensively studied in marine and continental successions from both hemispheres, was marked by the widespread expansion of anoxic and euxinic waters, geographically extensive deposition of organic-rich black shales, and climatic and environmental perturbations. Climatic and environmental processes following the T-OAE are, however, poorly known, largely due to a lack of study of stratigraphically well-constrained and complete sedimentary archives. Here, we present integrated geochemical and physical proxy data (high-resolution carbon-isotope data (δ13C), bulk and molecular organic geochemistry, inorganic petrology, mineral characterisation, and major- and trace-element concentrations) from the biostratigraphically complete and expanded entire Toarcian succession in the Llanbedr (Mochras Farm) Borehole, Cardigan Bay Basin, Wales, UK. With these data, we (1) construct the first high-resolution biostratigraphically calibrated chemostratigraphic reference record for nearly the complete Toarcian Stage, (2) establish palaeoceanographic and depositional conditions in the Cardigan Bay Basin, (3) show that the T-OAE in the hemipelagic Cardigan Bay Basin was marked by the occurrence of gravity-flow deposits that were likely linked to globally enhanced sediment fluxes to continental margins and deeper marine (shelf) basins, and (4) explore how early Toarcian (tenuicostatum and serpentinum zones) siderite formation in the Cardigan Bay Basin may have been linked to low global oceanic sulphate concentrations and elevated supply of iron (Fe) from the hinterland, in response to climatically induced changes in hydrological cycling, global weathering rates and large-scale sulphide and evaporite deposition. © 2017 The Authors Article 2018 English 0012821X 10.1016/j.epsl.2017.12.037 Earth and Planetary Science Letters 484 Elsevier B.V. 396 – 411 Cardigan Bay; United Kingdom; Wales; Carbon; Deposits; Geochemistry; Iron deposits; Iron ores; Isotopes; Sedimentology; Sulfur compounds; Trace elements; Weathering; Carbon isotope stratigraphy; Early Jurassic; Global weathering rates; Gravity flows; Oceanic anoxic events; siderite; biostratigraphy; carbon cycle; carbon isotope; deposition; depositional environment; evaporite; global climate; paleoceanography; paleotemperature; siderite; stratigraphy; sulfide; Toarcian; weathering; Stratigraphy https://www.scopus.com/inward/record.uri?eid=2-s2.0-85044768889&doi=10.1016%2fj.epsl.2017.12.037&partnerID=40&md5=651d1f0f30fe35bed87527811ccdde64 Cited by: 101; All Open Access, Green Open Access, Hybrid Gold Open Access Weimu Xu Micha Ruhl Hugh C. Jenkyns Jennifer M. Huggett Daniel Minisini Clemens V. Ullmann James B. Riding Johan W.H. Weijers Marisa S. Storm Lawrence M.E. Percival Erdem F. Idiz Erik W. Tegelaar Stephen P. Hesselbo article Xu2018594 The Lower Jurassic Toarcian Stage (c. 183–174 Ma) is marked by one of the largest global exogenic carbon-cycle perturbations of the Phanerozoic, which is associated with the early Toarcian Oceanic Anoxic Event (T-OAE; c. 183 Ma). Climatic and environmental change at the T-OAE is reasonably well constrained in the marine realm, with marine anoxic or euxinic conditions developing locally across both hemispheres, at the same time as the T-OAE negative carbon-isotope excursion. However, high-resolution stratigraphic comparison between different palaeo-ocean basins and with the continental realm can be complicated. Palaeomagnetic reversals can provide a precise and accurate stratigraphic correlation tool between marine and continental sedimentary archives, and even between sedimentary and igneous successions. Here, we present a high-resolution magnetostratigraphic record for the Toarcian Stage in the biostratigraphically complete and expanded Llanbedr (Mochras Farm) Borehole, Cardigan Bay Basin, Wales. This study provides the first geomagnetic polarity reversal scale that is integrated with high-resolution biostratigraphy and carbon-isotope stratigraphy for the entire Toarcian Stage. This stratigraphic framework also provides a new, precise correlation with the basalt lava sequence of the Karoo–Ferrar Large Igneous Province, linking the Pliensbachian– Toarcian boundary and T-OAE climatic and environmental perturbations directly to this episode of major volcanic activity. © 2018 The Author(s). Article 2018 English 00167649 10.1144/jgs2017-120 Journal of the Geological Society 175 Geological Society of London 594 – 604 4 United Kingdom; Wales; Carbon; Geomagnetism; Isotopes; Sedimentology; Volcanoes; Carbon isotope stratigraphy; Environmental perturbations; Geomagnetic polarity reversal; Large igneous provinces; Negative carbon isotope excursions; Precise correlations; Stratigraphic correlation; Stratigraphic framework; carbon cycle; climate variation; environmental change; magnetostratigraphy; paleoclimate; paleoenvironment; paleomagnetism; Toarcian; Stratigraphy https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049010557&doi=10.1144%2fjgs2017-120&partnerID=40&md5=48d50481f1d61f4699de65226792a716 Cited by: 29; All Open Access, Green Open Access, Hybrid Gold Open Access Weimu Xu Conall Mac Niocaill Micha Ruhl Hugh C. Jenkyns James B. Riding Stephen P. Hesselbo article Powell2016109 Site investigation borehole cores and temporary shaft exposures at the Toll House Pumping Station shaft site, Castle Hill, Scarborough, North Yorkshire, have revealed new data on the Callovian to Lower Oxfordian (Jurassic) succession. The condensed transgressive marine unit, the Lower Callovian Cornbrash Formation, rich in berthierine ooids and abundant shelly fossils, and the attenuated Cayton Clay Formation represent the Early Callovian marine transgression that flooded the low-gradient alluvial plain, which is represented by the underlying Scalby Formation. The Callovian Osgodby Formation (Red Cliff Rock and Langdale members) is an extensively bioturbated, silty sandstone with abundant berthierine-pyrite ooids in the lower part. It was deposited in lower- to upper-shoreface settings. Slow sedimentation rates, with long sediment residence time, resulted in a diverse ichnofauna and a high bioturbation index. Framboidal pyrite ooids in the lower Osgodby Formation sandstones are interpreted as being formed in anoxic lagoons in the nearshore zone; ooids were subsequently swept offshore during storm surge-ebb events. Cold water dinoflagellate cysts of Boreal affinity such as Gonyaulacysta dentata in the lower part of the Oxford Clay Formation indicate an Early Oxfordian age. This is confirmed by the presence of the zonal ammonite species Quenstedoceras mariae and is consistent with a relatively cold, but warming, palaeoclimate at this time. Shaft excavations revealed a new major fault, the Toll House Fault, which is interpreted to be a splay fault bifurcating off the main Castle Hill Fault. Together, the Toll House and Castle Hill faults form the western bounding faults of the Peak Trough, a graben-like structure that extends northwards, offshore.Supplementary material: Supplementary data 1 (Macrofossil identifications from the Toll House shaft) and Supplementary data 2 (List of macropalaeontological specimens from the Toll House Boreholes) are available at https://dx.doi.org/10.6084/m9.figshare.c.3469968. © 2016 The Author(s). Published by The Geological Society of London for the Yorkshire Geological Society. All rights reserved. Article 2016 English 00440604 10.1144/pygs2016-365 Proceedings of the Yorkshire Geological Society 61 Geological Society of London 109 – 133 2 England; North Yorkshire; Scarborough [North Yorkshire]; United Kingdom; Ammonoidea; Dinophyceae; bioturbation; Callovian; Oxfordian; sandstone; sedimentation rate; sedimentology; storm surge; stratigraphy; transgression https://www.scopus.com/inward/record.uri?eid=2-s2.0-84999700147&doi=10.1144%2fpygs2016-365&partnerID=40&md5=70224495142221c3f04f712a83c3899e Cited by: 5; All Open Access, Green Open Access John H. Powell James B. Riding article Suan2012191 We present new geochemical and sedimentological data from marginal marine strata of Penarth Bay, south Wales (UK) to elucidate the origin of widespread but enigmatic concentrations of vertebrate hard parts (bonebeds) in marine successions of Rhaetian age (late Triassic). Sedimentological evidence shows that the phosphatic constituents of the bonebeds were subjected to intense phosphatization in shallow current dominated settings and subsequently reworked and transported basinward by storms. Inter bedded organic-rich strata deposited under quiescent and poorly oxygenated conditions record enhanced phosphorus regeneration from sedimentary organic matter into the water column and probably provided the main source of phosphate required for heavy bonebed clast phosphatization. The stratigraphically limited interval showing evidence for oxygen depletion and accelerated P-cycling coincides with a negative 4‰ organic carbon isotope excursion, which possibly reflects supra-regional changes in carbon cycling and clearly predates the 'initial isotope excursion' characterizing many Triassic-Jurassic boundary strata. our data indicate that Rhaetian bonebeds are the lithological signature of profound, climatically driven changes in carbon cycling and redox conditions and support the idea of a multi-pulsed environmental crisis at the end of the Triassic, possibly linked to successive episodes of igneous activity in the central Atlantic Magmatic Province. Article 2012 English 00167649 10.1144/0016-76492011-045 Journal of the Geological Society 169 Geological Society of London 191 – 200 2 South Wales; United Kingdom; Wales; Vertebrata; Barium alloys; Isotopes; Lithology; Carbon isotope excursions; Central atlantic magmatic provinces; Environmental change; Environmental crisis; Sedimentary organic matter; Sedimentological data; Sedimentological evidence; Triassic-Jurassic boundary; carbon cycle; environmental change; geochemistry; Jurassic; mass extinction; organic matter; paleoenvironment; petrogenesis; phosphate; phosphatization; redox conditions; Rhaetian; sedimentology; stratigraphic boundary; stratigraphy; vertebrate; water column; Organic carbon https://www.scopus.com/inward/record.uri?eid=2-s2.0-84857820298&doi=10.1144%2f0016-76492011-045&partnerID=40&md5=c7beee9316f512bf3da9024b23a9d7a5 Cited by: 24; All Open Access, Green Open Access Guillaume Suan Karl B. Föllmi Thierry Adatte Brahimsamba Bomou Jorge E. Spangenberg Bas Schootbrugge article Korte2011 For much of the Mesozoic record there has been an inconclusive debate on the possible global significance of isotopic proxies for environmental change and of sequence stratigraphic depositional sequences. We present a carbon and oxygen isotope and elemental record for part of the Early Jurassic based on marine benthic and nektobenthic molluscs and brachiopods from the shallow marine succession of the Cleveland Basin, UK. The invertebrate isotope record is supplemented with carbon isotope data from fossil wood, which samples atmospheric carbon. New data elucidate two major global carbon isotope events, a negative excursion of ∼2‰ at the Sinemurian-Pliensbachian boundary, and a positive excursion of ∼2‰ in the Late Pliensbachian. The Sinemurian-Pliensbachian boundary event is similar to the slightly younger Toarcian Oceanic Anoxic Event and is characterized by deposition of relatively deepwater organic-rich shale. The Late Pliensbachian strata by contrast are characterized by shallow marine deposition. Oxygen isotope data imply cooling locally for both events. However, because deeper water conditions characterize the Sinemurian-Pliensbachian boundary in the Cleveland Basin the temperature drop is likely of local significance; in contrast a cool Late Pliensbachian shallow seafloor agrees with previous inference of partial icehouse conditions. Both the large-scale, long-term and small-scale, short-duration isotopic cycles occurred in concert with relative sea level changes documented previously from sequence stratigraphy. Isotope events and the sea level cycles are concluded to reflect processes of global significance, supporting the idea of an Early Jurassic in which cyclic swings from icehouse to greenhouse and super greenhouse conditions occurred at timescales from 1 to 10 Ma. Copyright 2011 by the American Geophysical Union. Article 2011 English 08838305 10.1029/2011PA002160 Paleoceanography 26 Blackwell Publishing Ltd 4 Cleveland Basin; England; North Yorkshire; United Kingdom; anoxic conditions; benthos; biostratigraphy; brachiopod; carbon isotope; depositional sequence; environmental change; fossil record; glaciation; greenhouse effect; nekton; oxygen isotope; paleoceanography; paleoenvironment; Pliensbachian; sea level change; seafloor; sequence stratigraphy; Sinemurian https://www.scopus.com/inward/record.uri?eid=2-s2.0-84055197806&doi=10.1029%2f2011PA002160&partnerID=40&md5=52e23d1862232bcc1e811cb1b2fe9a34 Cited by: 176; All Open Access, Bronze Open Access Christoph Korte Stephen P. Hesselbo article Huang2010242 The Late Jurassic Kimmeridge Clay Formation (KCF) is an economically important, organic-rich source rock of Kimmeridgian-Early Tithonian age. The main rock types of the KCF in Dorset, UK, include grey to black laminated shale, marl, coccolithic limestone, and dolostone, which occur with an obvious cyclicity at astronomical timescales. In this study, we examine two high-resolution borehole records (Swanworth Quarry 1 and Metherhills 1) obtained as part of a Rapid Global Geological Events (RGGE) sediment drilling project. Datasets examined were total organic carbon (TOC), and borehole wall microconductivity by Formation Microscanner (FMS). Our intent is to assess the rhythmicity of the KCF with respect to the astronomical timescale, and to discuss the results with respect to other key Late Jurassic geological processes. Power spectra of the untuned data reveal a hierarchy of cycles throughout the KCF with ∼ 167 m, ∼ 40 m, 9.1 m, 3.8 m and 1.6 m wavelengths. Tuning the ∼ 40 m cycles to the 405-kyr eccentricity cycle shows the presence of all the astronomical parameters: eccentricity, obliquity, and precession index. In particular, ∼ 100-kyr and 405-kyr eccentricity cycles are strongly expressed in both records. The 405-kyr eccentricity cycle corresponds to relative sea-level changes inferred from sequence stratigraphy. Intervals with elevated TOC are associated with strong obliquity forcing. The 405-kyr-tuned duration of the lower KCF (Kimmeridgian Stage) is 3.47 Myr, and the upper KCF (early part of the Tithonian Stage, elegans to fittoni ammonite zones) is 3.32 Myr. Two other chronologies test the consistency of this age model by tuning ∼ 8-10 m cycles to 100-kyr (short eccentricity), and ∼ 3-5 m cycles to 36-kyr (Jurassic obliquity). The 'obliquity-tuned' chronology resolves an accumulation history for the KCF with a variation that strongly resembles that of Earth's orbital eccentricity predicted for 147.2 Ma to 153.8 Ma. There is evidence for significant non-deposition (up to 1 million years) in the lowermost KCF (baylei-mutabilis zones), which would indicate a Kimmeridgian/Oxfordian boundary age of 154.8 Ma. This absolute calibration allows assignment of precise numerical ages to zonal boundaries, sequence surfaces, and polarity chrons of the lower M-sequence. © 2009 Elsevier B.V. All rights reserved. Article 2010 English 0012821X 10.1016/j.epsl.2009.11.013 Earth and Planetary Science Letters 289 242 – 255 1-2 Dorset [England]; England; United Kingdom; Ammonoidea; Astrophysics; Boreholes; Clay minerals; Offshore oil wells; Organic carbon; Tuning; Absolute calibration; Accumulation history; Borehole records; Borehole wall; Cyclicity; Cyclostratigraphy; Data sets; Dolostones; Drilling projects; Earth systems; Eccentricity cycle; Elegans; England; Geological process; High resolution; Jurassic; Kimmeridge clay formation; M sequence; Microscanner; Orbital eccentricity; Organic-rich source rock; Power-spectra; Relative sea level; Rock types; Seafloor spreading; Sequence stratigraphy; Time-scales; Total organic carbon; accumulation; astrophysics; coccolith; cyclostratigraphy; data set; dolostone; drilling; eccentricity; geochronology; Jurassic; Kimmeridgian; lamination; limestone; marl; Oxfordian; parameterization; sea level change; seafloor spreading; sequence stratigraphy; shale; source rock; timescale; Tithonian; total organic carbon; wavelength; Stratigraphy https://www.scopus.com/inward/record.uri?eid=2-s2.0-72949102215&doi=10.1016%2fj.epsl.2009.11.013&partnerID=40&md5=c0853e365811c689006a2051265be828 Cited by: 64 Chunju Huang Stephen P. Hesselbo article Korte2009431 Carbon-isotope stratigraphy is a useful tool for stratigraphic correlation, especially for strata deposited during major perturbations of the carbon cycle that affected the marine, terrestrial and atmospheric reservoirs. For the Triassic-Jurassic boundary, effectively defined by a first-order mass extinction, major fluctuations in carbon-isotope values have been well documented, but these datasets have generally been derived from bulk-rock samples. Hence, the extent to which features of the isotopic curve reflect diagenetic alteration or changing proportions of constituent materials is unconstrained. Here, carbon- and oxygen-isotope data are presented from well-preserved oyster shells (Liostrea) comprising low-magnesium calcite, a mineral species relatively resistant to diagenetic alteration. Samples were obtained from Lavernock Point, Glamorgan, Wales, a coastal section close to a candidate stratotype for the base of the Jurassic at St Audrie's Bay, Somerset, England. The carbon-isotope signature from St Audrie's Bay, previously defined on the basis of analysis of bulk organic matter, is confirmed by our new data. Major features are (1) the upper part of an 'initial' negative isotope excursion in the lowest part of the section, followed by (2) a pronounced positive excursion, and (3) an extended 'main' negative isotope excursion in the highest part of the section. The data confirm that the carbon-isotope stratigraphy previously documented from bulk organic matter in SW England records the chemical composition of the contemporaneous seawater. Bulk carbonates sampled over the same interval near Lyme Regis, England, show similar trends to those from oyster calcite in the lower part of the study section, but there are more 13C-depleted values up-section. These lower values probably result from an admixture of primary and diagenetic carbonate. Palaeotemperatures calculated from oxygen-isotope values from Lavernock Point oyster shells are relatively cool at the beginning of the positive carbon-isotope excursion, and increased by up to 10 8C during the main negative carbon-isotope excursion. The new results are compatible with the view that positive carbon-isotope excursions correspond to times of low atmospheric carbon dioxide content, whereas negative carbon-isotope excursions correspond to times of high atmospheric carbon dioxide content, as is also found to be the case during the Early Jurassic (Toarcian) Oceanic Anoxic Event. The Mg/Ca and Sr/Ca ratios and 18O of investigated Liostrea hisingeri show no correlation,supporting data from modern bivalves that indicate that incorporation of Mg and Sr is controlled mainly by factors other than temperature. © 2009 Geological Society of London. Article 2009 English 00167649 10.1144/0016-76492007-177 Journal of the Geological Society 166 431 – 445 3 England; Eurasia; Europe; Glamorgan; Saint Audrie's Bay; Somerset; United Kingdom; Wales; Western Europe; Bivalvia; Ostreidae; carbon cycle; carbon dioxide; carbon isotope; chemical composition; Jurassic; oxygen isotope; paleoenvironment; paleotemperature; seawater; stratigraphic boundary; stratigraphic correlation; Triassic https://www.scopus.com/inward/record.uri?eid=2-s2.0-64749095283&doi=10.1144%2f0016-76492007-177&partnerID=40&md5=3b1a1884a96f5f2b0ebf0b9f3a6c6ef9 Cited by: 124 Christoph Korte Stephen P. Hesselbo Hugh C. Jenkyns Rosalind E.M. Rickaby Christoph Spötl article Hesselbo200819 Sequence stratigraphy - the subdivision of successions into facies packages bounded by surfaces representing major shifts in depositional environment - has provided a systematic methodology for inference of relative sea-level change from vertical facies successions. In the present review, sequence stratigraphic work on exposures of British Jurassic successions is summarized. Resultant inferred relative sea-level curves for Early Jurassic and early Mid Jurassic successions show some strong similarities at the scale of ammonite zones between widely separated basins, implying sea-level change of at least regional extent or, alternatively, regionally co-ordinated changes in sediment supply. Also well developed are coeval stage-level influxes of sandy sediments into widely separated marine basins during the Late Pliensbachian, Late Toarcian-Aalenian and Oxfordian. Similarly, widespread synchronous shifts to more offshore facies are evident in the Early Pliensbachian, Early Toarcian, Early Callovian and Early Kimmeridgian. © 2008 Geologists' Association. Article 2008 English 00167878 10.1016/S0016-7878(59)80069-9 Proceedings of the Geologists' Association 119 Geological Society of London 19 – 34 1 Eurasia; Europe; United Kingdom; Western Europe; Ammonoidea; depositional sequence; facies; Jurassic; sea level change; sequence stratigraphy https://www.scopus.com/inward/record.uri?eid=2-s2.0-40049088138&doi=10.1016%2fS0016-7878%2859%2980069-9&partnerID=40&md5=7bc8fe1295f3c18881800cbea2489c1a Cited by: 82 Stephen P. Hesselbo