Overview

I am a geochemist with particular interest in the geochemistry of modern and ancient marine shells and am part of the Deep Time Global Change Group. My current role is Lecturer in Palaeontology, Palaeobiology, Biogeochemistry at the Camborne School of Mines.

The three main topics I am working on are carbonate diagenesis, vital effects related to the process of bio-mineralization and reconstruction of past environments using isotopic and element tracers. I have been involved in work from the Mesoproterozoic up to modern times, but my main focus has been the Jurassic.

Marine animals form carbonate shells which vary greatly in composition, but follow predictable trends, an observation that may help to eventually reconstruct the past composition of seawater with improved certainty. In order to increase the quality of these reconstructions I am actively working on characterising the geochemical patterns of biomineralisation in modern calcite secreting organisms, e.g., bivalves, brachiopods, and barnacles, and fossils of extinct organisms such as the rostra of belemnites.

In order to help understanding past environmental conditions using proxy data, post-depositional effects modifying or erasing the original environmental signatures in sedimentary strata have to be controlled. Through detailed work on fossil materials, and covering novel proxies, as well as studying diagenetic signatures down to species-specific effects, much improved environmental reconstructions become feasible.

The isotopic signatures of large, marine fossil shells have traditionally been used to reconstruct carbon cycle and seawater temperatures. However, the geochemistry of fossils can also help to guide interpretations of palaeoecology which otherwise is limited to the assessment of fossil morphology and comparison to modern relatives. Using innovative methodology for example on belemnite rostra and brachiopod shells, the understanding of their ecology can be improved.

In addition to my research activity I act as an associated editor of Palaeo3 and am a mentor in the Publons Peer Reviewing Academy having received peer review awards in 2019 and 2017.

Biography

2021-                               Lecturer in Palaeontology, Palaeobiology, Biogeochemistry

2016-2021                        Researcher Co-I; University of Exeter, UK. Early Jurassic Earth System and Timescale (JET)

2014-2016                        Leopoldina Fellow; University of Exeter, UK. Research on biomineralization of brachiopods, barnacles and belemnites. 

2013-2014                        Post Doc; University of Copenhagen, Denmark. Research on geochemical proxies in biogenic carbonates. 

2012-2012                        Academic visitor; University of Oxford, UK. Lithium isotopes in belemnite calcite and Jurassic chemostratigraphy. 

2010-2013                        PhD; University of Copenhagen, Denmark.

2008-2010                        MSc; Freie Universität Berlin, Germany.

2005-2008                        BSc; Freie Universität Berlin, Germany.

ORCID

https://orcid.org/0000-0002-5865-7289

Publications

http://emps.exeter.ac.uk/csm/staff/cu211/publications

https://www.researchgate.net/profile/Clemens_Ullmann

Reviews

https://publons.com/author/1288428/clemens-vinzenz-ullmann#

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Publications

_{Copyright Notice: Any articles made available for download are for personal use only. Any other use requires prior permission of the author and the copyright holder.}

| 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2010 | 2009 |

2024

• Vickers ML, Jones MT, Longman J, Evans D, Ullmann CV, Wulfsberg Stokke E, Vickers M, Frieling J, Harper DT, Clementi VJ. (2024) Paleocene–Eocene age glendonites from the Mid-Norwegian Margin – indicators of cold snaps in the hothouse?, Climate of the Past, volume 20, no. 1, pages 1-23, DOI:10.5194/cp-20-1-2024. [PDF]
• Thibault N, Lauridsen BW, Schovsbo NH, Anderskouv K, Bjerrum CJ, Korte C, Martinez M, Morigi C, Stemmerik L, Ullmann CV. (2024) The Late Maastrichtian Rørdal Member (Denmark): a remarkable window of climatic, environmental and biotic changes at orbital timescales, Geological Society London Special Publications, volume 545, no. 1, DOI:10.1144/sp545-2023-124.

2023

• Hesselbo SP, Al-Suwaidi A, Baker SJ, Ballabio G, Belcher CM, Bond A, Boomer I, Bos R, Bjerrum CJ, Bogus K. (2023) Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic, Scientific Drilling, volume 32, pages 1-25, DOI:10.5194/sd-32-1-2023. [PDF]
• Schultz B, Huggett J, van de Schootbrugge B, Ullmann CV, Broch MC. (2023) Transgression Related Holocene Coastal Glendonites from Historic Sites, Minerals, volume 13, no. 9, DOI:10.3390/min13091159.
• Zhang F, Williamson BJ, Ullmann CV, Hughes HSR. (2023) Chemical changes during endoskarn and porphyry‐style alteration and Cu—Fe exoskarn mineralization in the Tonglushan system, eastern China, Resource Geology, volume 73, no. 1, DOI:10.1111/rge.12319. [PDF]
• Vickers ML, Jones MT, Longman J, Evans D, Ullmann CV, Stokke EW, Vickers M, Frieling J, Harper DT, Clementi VJ. (2023) Paleocene-Eocene age glendonites from the Norwegian Margin – Indicators of cold snaps in the hothouse?, DOI:10.5194/egusphere-2023-1651. [PDF]
• Vickers ML, Jones MT, Longman J, Evans D, Ullmann CV, Stokke EW, Vickers M, Frieling J, Harper DT, Clementi VJ. (2023) Supplementary material to "Paleocene-Eocene age glendonites from the Norwegian Margin – Indicators of cold snaps in the hothouse?", DOI:10.5194/egusphere-2023-1651-supplement. [PDF]
• Schultz BP, Huggett J, Ullmann CV, Kassens H, Kölling M. (2023) Links between Ikaite Morphology, Recrystallised Ikaite Petrography and Glendonite Pseudomorphs Determined from Polar and Deep-Sea Ikaite, Minerals, volume 13, no. 7, DOI:10.3390/min13070841.
• Hollaar TP, Hesselbo SP, Deconinck J-F, Damaschke M, Ullmann CV, Jiang M, Belcher CM. (2023) Environmental changes during the onset of the Late Pliensbachian Event (Early Jurassic) in the Cardigan Bay Basin, Wales, Climate of the Past, volume 19, no. 5, pages 979-997, DOI:10.5194/cp-19-979-2023. [PDF]
• Bodin S, Charpentier M, Ullmann CV, Rudra A, Sanei H. (2023) Carbon cycle during the late Aptian–early Albian OAE 1b: A focus on the Kilian–Paquier levels interval, Global and Planetary Change, volume 222, DOI:10.1016/j.gloplacha.2023.104074.
• Reddin C, Landwehrs J, Mathes G, Saupe E, Ullmann C, Feulner G, Aberhan M. (2023) Thermal niche determines marine assemblage change during Early Jurassic warming pulses, DOI:10.5194/egusphere-egu23-1631. [PDF]
• Vickers ML, Bernasconi SM, Peterse F, Sluijs A, Ullmann CV, Longman J, Stokke EW, Frieling J, Bajnai D, Clementi VJ. (2023) Volcanically driven short-term, regional-scale cooling during the early Paleogene Greenhouse?, DOI:10.5194/egusphere-egu23-5465. [PDF]
• Schultz BP, Huggett JM, Kennedy GL, Burger P, Friis H, Jensen AM, Kanstrup M, Bernasconi SM, Thibault N, Ullmann CV. (2023) Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiagvik (Barrow), Alaska, Norwegian Journal of Geology, DOI:10.17850/njg103-1-03.
• Schultz BP, Hugget JM, Kenndy GL, Burger P, Friis H, Jensen AM, Kanstrup M, Bernasconi SM, Thibault N, Ullmann CV. (2023) Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiaġvik (Barrow), Alaska, Norwegian Journal of Geology, DOI:10.17850/njg103-1-3.
• Vickers ML, Jelby ME, Śliwińska KK, Percival LME, Wang F, Sanei H, Price GD, Ullmann CV, Grasby SE, Reinhardt L. (2023) Volcanism and carbon cycle perturbations in the High Arctic during the Late Jurassic – Early Cretaceous, Palaeogeography Palaeoclimatology Palaeoecology, volume 613, DOI:10.1016/j.palaeo.2023.111412.
• Jarvis I, Pearce MA, Monkenbusch J, Jurkowska A, Ullmann CV, Dubicka Z, Thibault N. (2023) Carbon isotopes, palynology and stratigraphy of the Santonian–Campanian boundary: The GSSP auxiliary sections, Seaford Head (England) and Bocieniec (Poland), and correlation between the Boreal and Tethyan realms, Cretaceous Research, volume 143, DOI:10.1016/j.cretres.2022.105415.
• Pearce MA, Jarvis I, Monkenbusch J, Thibault N, Ullmann CV, Martinez M. (2023) Coniacian–Campanian palynology, carbon isotopes and clay mineralogy of the Poigny borehole (Paris Basin) and its correlation in NW Europe, Comptes Rendus Géoscience, volume 354, no. S3, pages 1-21, DOI:10.5802/crgeos.118.

2022

• Wang Y, Bodin S, Blusztajn JS, Ullmann C, Nielsen SG. (2022) Orbitally paced global oceanic deoxygenation decoupled from volcanic CO2 emission during the middle Cretaceous Oceanic Anoxic Event 1b (Aptian-Albian transition), Geology, volume 50, no. 11, pages 1324-1328, DOI:10.1130/g50553.1.
• Paganos P, Ullmann CV, Gaglio D, Bonanomi M, Salmistraro N, Arnone MI, Jimenez-Guri E. (2022) Plastic leachate-induced toxicity during sea urchin embryonic development: Insights into the molecular pathways affected by PVC, The Science of The Total Environment, volume 864, DOI:10.1016/j.scitotenv.2022.160901.
• Hollaar TP, Hesselbo SP, Deconinck J-F, Damaschke M, Ullmann CV, Jiang M, Belcher CM. (2022) Environmental changes during the onset of the Late Pliensbachian Event (Early Jurassic) in the Mochras Borehole, Cardigan Bay Basin, NW Wales, DOI:10.5194/cp-2022-87. [PDF]
• Hollaar TP, Hesselbo SP, Deconinck J-F, Damaschke M, Ullmann CV, Jiang M, Belcher CM. (2022) Supplementary material to "Environmental changes during the onset of the Late Pliensbachian Event (Early Jurassic) in the Mochras Borehole, Cardigan Bay Basin, NW Wales", DOI:10.5194/cp-2022-87-supplement. [PDF]
• Vickers ML, Vickers M, Rickaby REM, Wu H, Bernasconi SM, Ullmann CV, Bohrmann G, Spielhagen RF, Kassens H, Schultz BP. (2022) The ikaite to calcite transformation: Implications for palaeoclimate studies, Geochimica et Cosmochimica Acta, volume 334, pages 201-216, DOI:10.1016/j.gca.2022.08.001.
• Vickers ML, Hougård IW, Alsen P, Ullmann CV, Jelby ME, Bedington M, Korte C. (2022) Middle to Late Jurassic palaeoclimatic and palaeoceanographic trends in the Euro-Boreal region: Geochemical insights from East Greenland belemnites, Palaeogeography Palaeoclimatology Palaeoecology, volume 597, DOI:10.1016/j.palaeo.2022.111014.
• Vickers ML, Bernasconi SM, Schultz BP, Rogov M, Ershova V, Ullmann CV, Chivas AR, Dux FW, Jones M. (2022) Can glendonites be used as palaeothermometers?, DOI:10.5194/egusphere-egu22-3797. [PDF]
• Edward O, Korte C, Ullmann CV, Colmenar J, Thibault N, Bagnoli G, Stouge S, Rasmussen CMØ. (2022) A Baltic Perspective on the Early to Early Late Ordovician δ¹³C and δ¹⁸O Records and Its Paleoenvironmental Significance, Paleoceanography and Paleoclimatology, volume 37, no. 3, DOI:10.1029/2021pa004309. [PDF]
• Frederiksen JA, Ullmann CV, Frei R, Korte C. (2022) Strontium isotope ratios from the Swabo-Franconian Basin (Germany) and a new compilation of marine 87Sr/86Sr signatures for the Upper Sinemurian to Toarcian: global uniformity and driving forces for marine 87Sr/86Sr, Newsletters on Stratigraphy, volume 55, no. 3, pages 311-331, DOI:10.1127/nos/2021/0654.

2021

• Roper A, Newton R, Mills B, Ullmann C, Little C, Poulton S, Wignall P, He T. (2021) A novel marine phosphorus record from Lower Jurassic belemnites, Goldschmidt2021 abstracts, DOI:10.7185/gold2021.4657.
• de Winter N, Müller I, Kocken I, Thibault N, Ullmann C, Farnsworth A, Lunt D, Claeys P, Ziegler M. (2021) First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells, DOI:10.21203/rs.3.rs-128320/v1.
• de Winter NJ, Müller IA, Kocken IJ, Thibault N, Ullmann CV, Farnsworth A, Lunt DJ, Claeys P, Ziegler M. (2021) Absolute seasonal temperature estimates from clumped isotopes in bivalve shells suggest warm and variable greenhouse climate, Communications Earth & Environment, volume 2, no. 1, DOI:10.1038/s43247-021-00193-9.
• Aberhan M, Ullmann CV. (2021) Palaeoenvironments, Encyclopedia of Life Sciences, Wiley, 1-11, DOI:10.1002/9780470015902.a0029287.
• Peti L, Thibault N, Korte C, Ullmann CV, Cachão M, Fibæk M. (2021) Environmental drivers of size changes in lower Jurassic Schizosphaerella spp, Marine Micropaleontology, volume 168, DOI:10.1016/j.marmicro.2021.102053.
• Vickers ML, Bernasconi SM, Ullmann CV, Lode S, Looser N, Morales LG, Price GD, Wilby PR, Hougård IW, Hesselbo SP. (2021) Marine temperatures underestimated for past greenhouse climate, Sci Rep, volume 11, no. 1, DOI:10.1038/s41598-021-98528-1. [PDF]
• Beasley C, Kender S, Giosan L, Bolton CT, Anand P, Leng MJ, Nilsson‐Kerr K, Ullmann CV, Hesselbo SP, Littler K. (2021) Evidence of a South Asian Proto‐Monsoon During the Oligocene‐Miocene Transition, Paleoceanography and Paleoclimatology, volume 36, no. 9, DOI:10.1029/2021pa004278. [PDF]
• Munier T, Deconinck J-F, Pellenard P, Hesselbo SP, Riding JB, Ullmann CV, Bougeault C, Mercuzot M, Santoni A-L, Huret É. (2021) Million-year-scale alternation of warm–humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (late Sinemurian, Laurasian Seaway), Climate of the Past, volume 17, no. 4, pages 1547-1566, DOI:10.5194/cp-17-1547-2021. [PDF]
• Ullmann CV, Szȕcs D, Jiang M, Hudson AJL, Hesselbo SP. (2021) Geochemistry of macrofossil, bulk rock and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK, Journal of the Geological Society, volume 179, no. 1, DOI:10.1144/jgs2021-018. [PDF]
• Edward O, Korte C, Ullmann C, Colmenar J, Thibault N, Bagnoli G, Stouge S, Rasmussen CMØ. (2021) Baltic Perspective on Early to early Late Ordovician δ13C andδ18O Records and its Paleoenvironmental Significance, DOI:10.1002/essoar.10507187.1. [PDF]
• Razmjooei MJ, Shahryari S, Kani A, Ullmann CV, Jamali AM, Rahimi S, Vergés J, Thibault N. (2021) Integrated bio- and carbon isotope stratigraphy of the Campanian–Danian sedimentary succession in Lurestan (Zagros Basin, Iran): Implications for syntectonic facies distribution and basin evolution, Journal of Asian Earth Sciences, volume 214, DOI:10.1016/j.jseaes.2021.104779.
• Hougård IW, Bojesen-Koefoed JA, Vickers ML, Ullmann CV, Bjerrum CJ, Rizzi M, Korte C. (2021) Redox element record shows that environmental perturbations associated with the t-oae were of longer duration than the carbon isotope record suggests – the aubach section, sw germany, Newsletters on Stratigraphy, volume 54, no. 2, pages 229-246, DOI:10.1127/nos/2020/0630.
• Vickers M, Vickers M, Rickaby R, Wu H, Bernasconi S, Ullmann C, Bohrmann G, Spielhagen R, Thibault N, Korte C. (2021) The ikaite to calcite transformation: A key to understanding the palaeoclimatic significance of glendonites?, DOI:10.5194/egusphere-egu21-10140. [PDF]
• Hougård IW, Vickers ML, Alsen P, Jelby ME, Ullmann CV, Korte C. (2021)  Middle and Late Jurassic climatic, oceanographic and environmental trends along the Viking Corridor, DOI:10.5194/egusphere-egu21-10659. [PDF]
• Roper A, Ullmann C, Little C, Poulton S, Wignall P, He T, Newton R. (2021) A novel marine phosphorus record from Lower Jurassic belemnites?, DOI:10.5194/egusphere-egu21-2799. [PDF]
• Vickers ML, Jelby ME, Galloway JM, Percival L, Wang F, Sanei H, Śliwińska KK, Price GD, Ullmann CV, Hougård IW. (2021) Volcanism and carbon cycling in the High Arctic during the Late Jurassic – Early Cretaceous, DOI:10.5194/egusphere-egu21-1279. [PDF]
• Fernandez A, Korte C, Ullmann CV, Looser N, Wohlwend S, Bernasconi SM. (2021) Reconstructing the magnitude of Early Toarcian (Jurassic) warming using the reordered clumped isotope compositions of belemnites, Geochimica et Cosmochimica Acta, volume 293, pages 308-327, DOI:10.1016/j.gca.2020.10.005.

2020

• Winter ND, Müller I, Kocken I, Thibault N, Ullmann CV, Farnsworth A, Lunt D, Claeys P, Ziegler M. (2020) First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells, DOI:10.21203/rs.3.rs-39203/v1.
• Winter ND, Müller I, Kocken I, Thibault N, Ullmann CV, Farnsworth A, Lunt D, Claeys P, Ziegler M. (2020) First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells, DOI:10.21203/rs.3.rs-39203/v2.
• Piazza V, Ullmann CV, Aberhan M. (2020) Ocean warming affected faunal dynamics of benthic invertebrate assemblages across the Toarcian Oceanic Anoxic Event in the Iberian Basin (Spain), PLOS ONE, volume 15, no. 12, DOI:10.1371/journal.pone.0242331.
• Wilkin JTR, Hesselbo S, Ullmann C, Ruhl M, Henriques MH. (2020) Belemnite δ13C record across the Bajocian–Bathonian boundary, Cabo Mondego (Middle Jurassic, Portugal), Progressive Palaeontology, Online, 11th - 13th Jun 2020.
• Stoykova K, Granchovski G, Ullmann CV. (2020) First data on the expression of the campanian-maastrichtian boundary event in Bulgaria: Calcareous nannofossil and carbon isotope record, Comptes Rendus de L'Academie Bulgare des Sciences, volume 73, no. 12, pages 1711-1719, DOI:10.7546/CRABS.2020.12.11.
• Vickers ML, Lengger SK, Bernasconi SM, Thibault N, Schultz BP, Fernandez A, Ullmann C, McCormack P, Bjerrum CJ, Rasmussen JA. (2020) Cold spells in the Nordic Seas during the early Eocene Greenhouse, Nature Communications, volume 11, article no. 4713, DOI:10.1038/s41467-020-18558-7. [PDF]
• Munier T, Deconinck J-F, Pellenard P, Hesselbo SP, Riding JB, Ullmann CV, Bougeault C, Mercuzot M, Santoni A-L, Huret E. (2020) Million-year-scale alternation of warm-humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (Late Sinemurian, Laurasian Seaway), DOI:10.5194/cp-2020-99. [PDF]
• Hesselbo SP, Little CTS, Ruhl M, Thibault N, Ullmann CV. (2020) Comments on “Paleosalinity determination in ancient epicontinental seas: A case study of the T-OAE in the Cleveland Basin (UK)” by Remirez, M. N. and Algeo, T. J, Earth-Science Reviews, volume 208, DOI:10.1016/j.earscirev.2020.103290.
• Vickers ML, Fernandez A, Hesselbo S, Price GD, Bernasconi SM, Lode S, Ullmann C, Thibault N, Hougaard IW, Korte C. (2020) Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry, Earth and Planetary Science Letters.
• de Winter NJ, Ullmann CV, Sørensen AM, Thibault N, Goderis S, Van Malderen SJM, Snoeck C, Goolaerts S, Vanhaecke F, Claeys P. (2020) Shell chemistry of the boreal Campanian bivalve <i>Rastellum diluvianum</i> (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster, Biogeosciences, volume 17, no. 11, pages 2897-2922, DOI:10.5194/bg-17-2897-2020. [PDF]
• Rizzi M, Thibault N, Ullmann CV, Ruhl M, Olsen TK, Moreau J, Clémence M-E, Mette W, Korte C. (2020) Sedimentology and carbon isotope stratigraphy of the Rhaetian Hochalm section (Late Triassic, Austria), Global and Planetary Change, volume 191, pages 103210-103210, article no. 103210, DOI:10.1016/j.gloplacha.2020.103210. [PDF]
• Ullmann C, Boyle R, Duarte LV, Hesselbo SP, Kasemann SA, Klein T, Lenton TM, Piazza V, Aberhan M. (2020) Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods, Scientific Reports, volume 10, DOI:10.1038/s41598-020-63487-6.
• Piazza V, Ullmann CV, Aberhan M. (2020) Temperature-related body size change of marine benthic macroinvertebrates across the Early Toarcian Anoxic Event, Scientific Reports, volume 10, no. 1, article no. 4675, DOI:10.1038/s41598-020-61393-5. [PDF]
• Charpentier M, Ullmann CV, Rudra A, Sanei H, Bodin S. (2020) Changes in carbon cycling across the OAE 1b cluster (Aptian-Albian transition): New insights from the Vocontian Basin, DOI:10.5194/egusphere-egu2020-13036. [PDF]
• Edward O, Korte C, Ullmann CV, Rasmussen CMØ. (2020) Late diagenetic versus near-primary isotopic compositions in Ordovician carbonate rocks and fossils: A Baltoscandian example, DOI:10.5194/egusphere-egu2020-14482. [PDF]
• de Winter N, Witbaard R, Ullmann C, Soerensen A, Thibault N, Müller I, Kocken I, Claeys P, Ziegler M. (2020) Absolute temperature seasonality from skeletal carbonates—Techniques and limitations of oxygen- and clumped isotope analyses, DOI:10.5194/egusphere-egu2020-2842. [PDF]
• Vickers M, Bernasconi S, Ullmann C, Hesselbo S, Price G, Korte C. (2020) Belemnites, clumped isotopes and oxygen fractionation, DOI:10.5194/egusphere-egu2020-260. [PDF]
• Storm MS, Hesselbo SP, Jenkyns HC, Ruhl M, Ullmann CV, Xu W, Leng MJ, Riding JB, Gorbanenko O. (2020) Orbital pacing and secular evolution of the Early Jurassic carbon cycle, Proceedings of the National Academy of Sciences, volume 117, no. 8, pages 3974-3982, DOI:10.1073/pnas.1912094117. [PDF]
• Razmjooei MJ, Thibault N, Kani A, Ullmann CV, Jamali AM. (2020) Santonian-Maastrichtian carbon-isotope stratigraphy and calcareous nannofossil biostratigraphy of the Zagros Basin: Long-range correlation, similarities and differences of carbon-isotope trends at global scale, Global and Planetary Change, volume 184, DOI:10.1016/j.gloplacha.2019.103075.
• Hesselbo SP, Hudson AJL, Huggett JM, Leng ML, Riding JB, Ullmann CV. (2020) Palynological, geochemical, and mineralogical characteristics of the Early Jurassic Liasidium Event in the Cleveland Basin, Yorkshire, UK, Newsletters on Stratigraphy.

2019

• Zhang F, Williamson BJ, Hughes HR, Ullmann CV. (2019) Isotopic constraints on the processes favouring endoskarn-over porphyry-style mineralisation in Cu porphyry systems: an example from the Daye district, China, Applied Earth Science: Transactions of the Institute of Mining and Metallurgy, volume 128, no. 2, pages 65-67, DOI:10.1080/25726838.2019.1607196.
• Wilkin JTR, Hesselbo S, Ullmann C, korte C. (2019) Belemnite geochemistry from Albstadt-Pfeffingen (Middle Jurassic, Baden-Württemberg, Germany), 3rd International Workshop and Fieldtrip of IGCP 655 Toarcian Oceanic Anoxic Event: Impact on Marine Carbon Cycle and Ecosystems,, Erlangen, 2nd - 5th Sep 2019.
• Jiang M, Hesselbo S, Ullmann C. (2019) Integrated sediment transport and provenance in Mesozoic environments: evidence from the Lower Jurassic, UK, DOI:10.7287/peerj.preprints.27993.
• Korte C, Ruhl M, Palfy J, Ullmann CV, Hesselbo SP. (2019) Chemostratigraphy across the Triassic–Jurassic boundary, Chemostratigraphy Across Major Chronological Boundaries, John Wiley & Sons, 185-210.
• de Winter NJ, Ullmann CV, Sørensen AM, Thibault NR, Goderis S, Van Malderen SJM, Snoeck C, Goolaerts S, Vanhaecke F, Claeys P. (2019) Shell chemistry of the Boreal Campanian bivalve <i>Rastellum diluvianum</i> (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster, DOI:10.5194/bg-2019-74. [PDF]
• Mette W, Clemence ME, Thibault N, Korte C, Konrad B, Ullmann CV. (2019) Sedimentology, carbon isotope stratigraphy and micropalaeontology of the Rhaetian Zlambach Formation– Implications for the Dachstein carbonate platform development (Northern Calcareous Alps, Austria), Sedimentary Geology, volume 382, pages 47-60, DOI:10.1016/j.sedgeo.2018.12.009.

2018

• Razmjooei MJ, Thibault N, Kani A, Dinares-Turell J, Puceat E, Shahriari S, Radmacher W, Mohammad Jamali A, Ullmann CV, Voigt S. (2018) Integrated bio- and carbon-isotope stratigraphy of the Upper Cretaceous Gurpi Formation (Iran): A new reference for the eastern Tethys and its implications for large-scale correlation of stage boundaries, Cretaceous Research, volume 91, pages 312-340, DOI:10.1016/j.cretres.2018.07.002.
• Gilleaudeau GJ, Voegelin AR, Thibault N, Moreau J, Ullmann CV, Klaebe RM, Korte C, Frei R. (2018) Stable isotope records across the Cretaceous-Paleogene transition, Stevns Klint, Denmark: New insights from the chromium isotope system, Geochimica et Cosmochimica Acta, volume 235, pages 305-332, DOI:10.1016/j.gca.2018.04.028.
• Dellinger M, West AJ, Paris G, Adkins JF, Pogge von Strandmann PAE, Ullmann CV, Eagle RA, Freitas P, Bagard M-L, Ries JB. (2018) The Li isotope composition of marine biogenic carbonates: Patterns and Mechanisms, Geochimica et Cosmochimica Acta, DOI:10.1016/j.gca.2018.03.014.
• Pereira NS, Sial AN, Kilbourne KH, Liu S-C, Shen C-C, Ullmann CV, Frei R, Kikuchi RKP, Ferreira VP, Braga BLSS. (2018) Carbon stable isotope record in the coral species Siderastrea stellata: A link to the Suess Effect in the tropical South Atlantic Ocean, Palaeogeography, Palaeoclimatology, Palaeoecology, volume 497, pages 82-90, DOI:10.1016/j.palaeo.2018.02.007.
• Xu W, Ruhl M, Jenkyns HC, Leng MJ, Huggett JM, Minisini JM, Ullmann CV, Riding JB, Weijers JWH, Storm MS. (2018) Evolution of the Toarcian (Early Jurassic) carbon-cycle and global climatic controls on local sedimentary processes (Cardigan Bay Basin, UK), Earth and Planetary Science Letters.

2017

• Schobben M, van de Velde S, Suchocka J, Leda L, Korn D, Struck U, Ullmann CV, Hairapetian V, Ghaderi A, Korte C. (2017) Supplementary material to "Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation", DOI:10.5194/cp-2017-66-supplement. [PDF]
• Thibault N, Ruhl M, Korte C, Ullmann CV, Kemp DB, Gröcke DR, Hesselbo SP. (2017) The wider context of the Lower Jurassic Toarcian oceanic anoxic event in Yorkshire coastal outcrops, UK, Proceedings of the Geologists' Association, DOI:10.1016/j.pgeola.2017.10.007.
• Schobben M, van de Velde S, Gliwa J, Leda L, Korn D, Struck U, Ullmann CV, Hairapetian V, Ghaderi A, Korte C. (2017) Latest Permian carbonate carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation, Climate of the Past, volume 13, pages 1635-1659, DOI:10.5194/cp-13-1635-2017.
• Broom-Fendley SL, Wall F, Spiro B, Ullmann CV. (2017) Deducing the source and composition of rare earth mineralising fluids in carbonatites: insights from isotopic (C, O, 87Sr/86Sr) data from Kangankunde, Malawi, Contributions to Mineralogy and Petrology, volume 172, pages 96-96, DOI:10.1007/s00410-017-1412-7.
• Schobben M, van de Velde S, Suchocka J, Leda L, Korn D, Struck U, Ullmann CV, Hairapetian V, Ghaderi A, Korte C. (2017) Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation, DOI:10.5194/cp-2017-66. [PDF]
• Ullmann CV, Korte C, Bitner MA, Azmy K, Brand U. (2017) Geochemistry of the brachiopod Hemithiris psittacea from the Canadian Arctic: Implications for high latitude palaeoclimate studies, Chemical Geology, volume 466, pages 187-198, DOI:10.1016/j.chemgeo.2017.06.007.
• Pereira NS, Sial AN, Frei R, Ullmann CV, Korte C, Kikuchi RKP, Ferreira VP, Kilbourne KH. (2017) The potential of the coral species Porites astreoides as a paleoclimate archive for the Tropical South Atlantic Ocean, Journal of South American Earth Sciences, volume 77, pages 276-285, DOI:10.1016/j.jsames.2017.05.008.
• Korte C, Thibault N, Ullmann CV, Clémence M-E, Mette W, Olsen TK, Rizzi M, Ruhl M. (2017) Brachiopod biogeochemistry and isotope stratigraphy from the Rhaetian Eiberg section in Austria: potentials and limitations, Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, volume 284, pages 117-138, DOI:10.1127/njgpa/2017/0651.
• Ullmann CV, Frei R, Korte C, Lüter C. (2017) Element/Ca, C and O isotope ratios in modern brachiopods: Species-specific signals of biomineralization, Chemical Geology, volume 460, pages 15-24, DOI:10.1016/j.chemgeo.2017.03.034.
• Ullmann CV, Pogge von Strandmann PAE. (2017) The effect of shell secretion rate on Mg / Ca and Sr / Ca ratios in biogenic calcite as observed in a belemnite rostrum, Biogeosciences, volume 14, pages 89-97, DOI:10.5194/bg-14-89-2017.

2016

• Ullmann CV. (2016) Reply to RC1, DOI:10.5194/bg-2016-340-ac1. [PDF]
• Ullmann CV. (2016) Reply to RC2, DOI:10.5194/bg-2016-340-ac2. [PDF]
• Peti L, Thibault N, Clémence M-E, Korte C, Dommergues J-L, Bougeault C, Pellenard P, Jelby ME, Ullmann CV. (2016) Sinemurian–Pliensbachian calcareous nannofossil biostratigraphy and organic carbon isotope stratigraphy in the Paris Basin: Calibration to the ammonite biozonation of NW Europe, Palaeogeography, Palaeoclimatology, Palaeoecology, volume 468, pages 142-161, DOI:10.1016/j.palaeo.2016.12.004.
• Korte C, Ullmann CV. (2016) Permian strontium isotope stratigraphy, Geological Society, London, Special Publications, volume 450, pages 105-118, DOI:10.1144/SP450.5.
• Ullmann CV. (2016) The effect of precipitation rate on Mg/Ca and Sr/Ca ratios in biogenic calcite as observed in a belemnite rostrum, Biogeosciences Discussions, pages 1-14, DOI:10.5194/bg-2016-340.
• Ruhl M, Hesselbo SP, Hinnov L, Jenkyns HC, Xu W, Riding JB, Storm M, Minisini D, Ullmann CV, Leng M. (2016) Astronomical constraints on the duration of the Early JurassicPliensbachianStage and global climatic fluctuations, Earth and Planetary Science Letters, volume 455, pages 149-165, DOI:10.1016/j.epsl.2016.08.038.
• Moreau J, Boussaha M, Nielsen L, Thibault N, Ullmann CV, Stemmerik L. (2016) Early diagenetic evolution of the Chalk in eastern Denmark, The Depositional Record, volume 2, pages 154-172, DOI:10.1002/dep2.19.
• Harlou R, Ullmann CV, Korte C, Lauridsen BW, Schovsbo NH, Surlyk F, Thibault N, Stemmerik L. (2016) Geochemistry of Campanian–Maastrichtian brachiopods from the Rørdal-1 core (Denmark): Differential responses to environmental change and diagenesis, Chemical Geology, volume 442, pages 35-46, DOI:10.1016/j.chemgeo.2016.08.039.
• Pienkowski G, Hodbod M, Ullmann CV. (2016) Fungal decomposition of terrestrial organic matter accelerated Early Jurassic climate warming, Scientific Reports, volume 6, DOI:10.1038/srep31930.
• Magna T, Novák M, Cempírek J, Janoušek V, Ullmann CV, Wiechert U. (2016) Crystallographic control on lithium isotope fractionation in Archean to Cenozoic lithium-cesium-tantalum pegmatites, Geology, volume 44, no. 8, pages 655-658, DOI:10.1130/g37712.1. [PDF]
• Rasmussen CMØ, Ullmann CV, Jakobsen KG, Lindskog A, Hansen J, Hansen T, Eriksson ME, Dronov A, Frei R, Korte C. (2016) Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse, Scientific Reports, volume 6, no. 1, article no. 18884, DOI:10.1038/srep18884. [PDF]
• Schobben M, Ullmann CV, Leda L, Korn D, Struck U, Reimold WU, Ghaderi A, Algeo TJ, Korte C. (2016) Discerning primary versus diagenetic signals in carbonate carbon and oxygen isotope records: An example from the Permian–Triassic boundary of Iran, Chemical Geology, volume 422, pages 94-107, DOI:10.1016/j.chemgeo.2015.12.013. [PDF]
• Ullmann CV, Campbell HJ, Frei R, Korte C. (2016) Oxygen and carbon isotope and Sr/Ca signatures of high-latitude Permian to Jurassic calcite fossils from New Zealand and New Caledonia, Gondwana Research, volume 38, pages 60-73, DOI:10.1016/j.gr.2015.10.010.

2015

• Kröger B, Ebbestad JOR, Lehnert O, Ullmann CV, Korte C, Frei R, Rasmussen CMØ. (2015) Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations, Journal of the Geological Society, volume 172, no. 3, pages 349-356, DOI:10.1144/jgs2014-071. [PDF]
• Pereira NS, Sial AN, Kikuchi RKP, Ferreira VP, Ullmann CV, Frei R, Cunha AMC. (2015) Coral-based climate records from tropical South Atlantic: 2009/2010 ENSO event in C and O isotopes from Porites corals (Rocas Atoll, Brazil), Anais da Academia Brasileira de Ciências, volume 87, pages 1939-1957, DOI:10.1590/0001-3765201520150072.
• Sørensen AM, Ullmann CV, Thibault N, Korte C. (2015) Geochemical signatures of the early Campanian belemnite Belemnellocamax mammillatus from the Kristianstad Basin in Scania, Sweden, Palaeogeography, Palaeoclimatology, Palaeoecology, volume 433, pages 191-200, DOI:10.1016/j.palaeo.2015.05.025. [PDF]
• Teng F, Yin Q, Ullmann CV, Chakrabarti R, Pogge von Strandmann PAE, Yang W, Li W, Ke S, Sedaghatpour F, Wimpenny J. (2015) Interlaboratory comparison of magnesium isotopic compositions of 12 felsic to ultramafic igneous rock standards analyzed by MC‐ICPMS, Geochemistry, Geophysics, Geosystems, volume 16, no. 9, pages 3197-3209, DOI:10.1002/2015gc005939. [PDF]
• ULLMANN CV, KORTE C. (2015) Diagenetic alteration in low-Mg calcite from macrofossils: a review, Geological Quarterly, DOI:10.7306/gq.1217. [PDF]
• Korte C, Hesselbo SP, Ullmann CV, Dietl G, Ruhl M, Schweigert G, Thibault N. (2015) Jurassic climate mode governed by ocean gateway, Nature Communications, volume 6, DOI:10.1038/ncomms10015.
• Ullmann CV, Frei R, Korte C, Hesselbo SP. (2015) Chemical and isotopic architecture of the belemnite rostrum, Geochimica et Cosmochimica Acta, DOI:10.1016/j.gca.2015.03.034.

2014

• Eidvin T, Ullmann CV, Dybkjær K, Rasmussen ES, Piasecki S. (2014) Discrepancy between Sr isotope and biostratigraphic datings of the upper middle and upper Miocene successions (Eastern North Sea Basin, Denmark), Palaeogeography, Palaeoclimatology, Palaeoecology, volume 411, pages 267-280, DOI:10.1016/j.palaeo.2014.07.005. [PDF]
• Jelby ME, Thibault N, Surlyk F, Ullmann CV, Harlou R, Korte C. (2014) The lower Maastrichtian Hvidskud succession, Møns Klint, Denmark: calcareous nannofossil biostratigraphy, carbon isotope stratigraphy, and bulk and brachiopod oxygen isotopes, Bulletin of the Geological Society of Denmark, volume 62, pages 89-94.
• Ullmann CV, Campbell HJ, Frei R, Korte C. (2014) Geochemical signatures in Late Triassic brachiopods from New Caledonia, New Zealand Journal of Geology and Geophysics, volume 57, no. 4, pages 420-431, DOI:10.1080/00288306.2014.958175.
• Ullmann CV, Thibault N, Ruhl M, Hesselbo SP, Korte C. (2014) Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution, Proc Natl Acad Sci U S A, volume 111, no. 28, pages 10073-10076, DOI:10.1073/pnas.1320156111. [PDF]

2013

• Ullmann CV, Böhm F, Rickaby REM, Wiechert U, Korte C. (2013) The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies, Geochemistry, Geophysics, Geosystems, volume 14, no. 10, pages 4109-4120, DOI:10.1002/ggge.20257. [PDF]
• Hesselbo SP, Bjerrum CJ, Hinnov LA, MacNiocaill C, Miller KG, Riding JB, van de Schootbrugge B, Mochras Revisited Science Team. (2013) Mochras borehole revisited: a new global standard for Early Jurassic earth history, Scientific Drilling, volume 16, pages 81-91, DOI:10.5194/sd-16-81-2013.
• Ullmann CV, Hesselbo Stephen P. SP, Korte C. (2013) Tectonic forcing of early to middle jurassic seawater Sr/Ca, Geology, volume 41, no. 12, pages 1211-1214, DOI:10.1130/G34817.1.
• Ullmann CV, Campbell HJ, Frei R, Hesselbo SP, Pogge von Strandmann PAE, Korte C. (2013) Partial diagenetic overprint of Late Jurassic belemnites from New Zealand: Implications for the preservation potential of δ⁷Li values in calcite fossils, Geochimica et Cosmochimica Acta, volume 120, pages 80-96, DOI:10.1016/j.gca.2013.06.029.

2010

• Ullmann CV, Wiechert U, Korte C. (2010) Oxygen isotope fluctuations in a modern North Sea oyster (Crassostrea gigas) compared with annual variations in seawater temperature: Implications for palaeoclimate studies, Chemical Geology, volume 277, no. 1-2, pages 160-166, DOI:10.1016/j.chemgeo.2010.07.019. [PDF]

2009

• Ullmann CV, Wiechert U, Korte C. (2009) Stable isotope variations in a modern North Sea oyster shell reflect annual environmental changes, GEOCHIMICA ET COSMOCHIMICA ACTA, volume 73, no. 13, pages A1360-A1360. [PDF]

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