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Karl B. Föllmi
University of Neuchâtel
GeomorphologyCretaceousGeologyPaleontologyAptian
152Publications
34H-index
4,372Citations
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Publications 168
Newest
#1Iris Schöllhorn (UNIL: University of Lausanne)H-Index: 1
#2Thierry Adatte (UNIL: University of Lausanne)H-Index: 45
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
view all 6 authors...
Abstract The mechanisms leading to environmental and climate change prior to and anticipating the well-studied Toarcian oceanic anoxic event are not completely understood. Specifically, the role of the continuing break-up of Pangea, associated palaeogeographic rearrangements, and the influence of volcanic activity are less well known. Therefore, we studied the Pliensbachian interval in the open marine, hemipelagic section of the Breggia Gorge in southern Switzerland, to elucidate the potential i...
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#1Guillaume Charbonnier (UNIL: University of Lausanne)H-Index: 6
#2Stéphanie Duchamp-Alphonse (University of Paris-Sud)H-Index: 9
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
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Abstract High-resolution clay mineral and δ18Ocarb analyses have been performed on three sections of Valanginian age (Early Cretaceous), from northwestern (~20–30°N) and southern (~53°S) Tethyan realms. The data have been integrated in a large set of published mineralogical (clays), and geochemical (δ18Ocarb, δ18Obivalve, δ18Olenticulina, δ18Obelemnite, and TEX86) data from 17 sections, situated between ~45°N and ~53°S. Based on this data set, we provide new insights into Valanginian climate con...
2 CitationsSource
#1Guillaume Charbonnier (UNIL: University of Lausanne)H-Index: 6
#2Thierry Adatte (UNIL: University of Lausanne)H-Index: 45
Last. Guillaume Suan (University of Lyon)H-Index: 15
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3 CitationsSource
#1L.M.E. Percival (UNIL: University of Lausanne)H-Index: 1
#2David P.G. Bond (University of Hull)H-Index: 28
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
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Abstract The Late Devonian was marked by repeated faunal crises and episodes of geographically widespread marine anoxia, and featured one of the ‘Big Five’ mass extinctions of the Phanerozoic Aeon during the Frasnian–Famennian transition. However, the processes responsible for causing the numerous anoxic events remain unclear. This study highlights the occurrence of disturbances to the phosphorus cycle during several Late Devonian crises by investigating sedimentary concentrations of the element...
2 CitationsSource
Abstract In the Vocontian Basin in southeastern France, the Aptian-Albian boundary is marked by the occurrence of four laminated black shales (Jacob, Kilian, Paquier, Leenhardt) corresponding to Oceanic Anoxic Event 1b (OAE1b). Equivalents of one or more of these intervals are also known from different regions in the Tethys, Atlantic, and Pacific, and correspond in time to major climatic and evolutionary perturbations. Here, we performed an integrated multi-proxy high-resolution study on the sec...
1 CitationsSource
#2Thierry AdatteH-Index: 45
Last. Karl B. FöllmiH-Index: 34
view all 5 authors...
1 CitationsSource
#1Iris Schöllhorn (UNIL: University of Lausanne)H-Index: 1
#2Thierry Adatte (UNIL: University of Lausanne)H-Index: 45
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
view all 7 authors...
Abstract Between the end-Triassic mass extinction and the Toarcian Oceanic Anoxic Event, the Early Jurassic witnessed important changes in carbon burial, palaeogeography and paleoceanography, which were linked to the initial breakup of Pangaea. In order to better understand the climate and environmental impact of this phase of major tectonic rearrangement we revisited a key section along the Dorset coast (UK) and used a multi-proxy geochemical approach for its analysis. Carbon isotopes (δ13C) me...
1 CitationsSource
#1Alicia Fantasia (UNIL: University of Lausanne)H-Index: 4
#2Thierry Adatte (UNIL: University of Lausanne)H-Index: 45
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
view all 6 authors...
Abstract The Toarcian Oceanic Anoxic Event (T-OAE, ~ 183 Ma) was an episode of extreme warmth, environmental changes and carbon cycle perturbation. We present a high-resolution study of the Peniche section (Lusitanian Basin, Portugal), recently defined as the Toarcian Global Stratotype Section and Point, to provide a review of the Pliensbachian–Toarcian (Pl–To) environmental and climatic changes. A large ~7‰-negative carbon-isotope excursion (CIE) is recorded within the T-OAE interval in bulk or...
1 CitationsSource
#1L.M.E. Percival (UNIL: University of Lausanne)H-Index: 1
#2David Selby (China University of Geosciences)H-Index: 36
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
view all 9 authors...
Anomalously high rates of continental weathering have frequently been proposed as a key stimulus for the development of widespread marine anoxia during a number of Late Devonian environmental and biospheric crises, which included a major mass extinction during the Frasnian–Famennian transition (marked by the Upper and Lower Kellwasser horizons). Here, this model is investigated by presenting the first stratigraphic record of osmium-isotope trends (187Os/188Os) in upper Devonian strata from the K...
3 CitationsSource
#1Lucie Bonvallet (UNIL: University of Lausanne)H-Index: 1
Last. Karl B. Föllmi (UNIL: University of Lausanne)H-Index: 34
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Abstract Urgonian platform carbonate (Cretaceous; Barremian, Aptian) forms an important lithostratigraphic unit in the Helvetic fold- and thrust unit of the northern Swiss Alps. Its widespread distribution and ubiquity allow for an integrated high-resolution study of macro- and microfacies, benthic foraminiferal biostratigraphy, sequence stratigraphy, and carbon-isotope and phosphorus records. The resulting data confirm the importance of environmental forcing and sea level change on the style of...
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