News and activities
June 2017: Field work for MSc thesis in the lower Cambrian sandstones of Kinnekulle Table Mountain, central Sweden. Well preserved trace fossils!
May 2017: Field work for BSc and MSc theses in the late Precambrian Visingsö Group.
May 2016: Deep drilling through Cambrian-Ordovician at Kinnekulle with Riksriggen. Information for media in Swedish.
February 2016: Initial field work in New Providence and Andros Island on Quaternary carbonates. Photo shows large-scale cross-bedding in Holocene carbonate sand dune in New Providence.
January 2016: Reconnaissance for deep drilling at Kinnekulle. Proposed drill site at Högkullen.
Broadcasted on Swedish Radio P4
Coverage by Gotland Allehanda
June 2015: Completing carbon isotope sampling campaign in Oslo region. Sitting on the Ordovician-Silurian boundary.
May 2015: Reconnaissance trip to Gotland to prepare for deep drilling. Studying Silurian reef limestone at Högklint.
June 2014: Field work and experience tour to classical Silurian localities of England and Wales.
May and August 2014: Field work in the Oslo-Asker district of southern Norway. Studying the Norwegian stratotype for the Ordovician-Silurian boundary, where the stratigraphy is upside-down!
June 2013: Chair of the IGCP 591 annual meeting in Lund. Regional excursion with one at the first stops at Rövarekulan locality to discuss Silurian shale fill of the Colonus Shale Trough. Field trip guide book to Palaeozoic outcrops of southern Sweden and Norway available here.
My teaching focuses on sedimentary processes and products on wide spatial and temporal scales – from river systems and deserts in the continental interiors to the pelagic rain in the deep ocean, and from the Precambrian to the recent. Students learn to identify ancient depositional environments through facies analysis and also to study how these systems evolved through time by means of sequence stratigraphy – in carbonate as well as clastic or mixed basins. Since my research background mainly is within carbonate rocks, palaeoecology and palaeontology is a natural and well integrated part of my teaching. Most of my exercises and field excursions are based on either the 'old' marine Cambro-Devonian Baltoscandian basin of south-eastern Scandinavia or the Swedish segment of the 'young' marine-continental Mesozoic Danish basin to the southwest. In the core laboratory in the basement of our department I have assembled a few hundreds of metres of Palaeozoic intracratonic stratigraphy. These cores are regularly used in my teaching for two reasons. It gives the students frequent opportunities to study 'the real thing', as a complement to field excursions, and a 'first-row-insight' into my research about the marine environment, climate change and extinction events during the Palaeozoic.
I am a specialist in sedimentary geology, sequence stratigraphy, and palaeoecology, and utilise fossil sediments and geochemistry to study the interplay of global change in climate, sea-level and biodiversity (minor and mass extinctions). I am Swedish leader for IGCP 591, the Early to Middle Palaeozoic revolution.
Ordovician sea-level, stable isotope stratigraphy and global climate
The principal goal of the research project is to establish the first Global Sea-level Model [GSM] for the Ordovician period [488-444 Ma]. The GSM will be based on reference districts in two palaeocontinents, representing different climate settings; the tropical parts of Laurentia (Great Basin, south-eastern USA) and temperate Baltoscandia (Sweden and East Baltic area). The recent very rapid development in carbon isotope stratigraphy and a new, globally applicable chronostratigraphical classification of the Ordovician, for the first time provide foundation for such study. Detailed sea-level records will be reconstructed through study of sedimentary proxies [facies analysis, sequence stratigraphy] and tied to the twenty new chronostratigraphic stage slices for the Ordovician by means of stable isotope stratigraphy and biostratigraphy. The result will be one composite high-resolution Composite Eustasy Stratotype Section [CESS] from each continent, which together forms the basis for the global model. The usage of the stratigraphically very well defined, and internationally agreed, stage slices as basic correlative unit for the first time permit a future regular revision and update of the GSM.
Silurian extinction events and climate – impact on carbonate platform ecosystems
In this project I primarily study the coupled extinction events and carbon isotope excursions of the Silurian on a broad interdisciplinary basis by integrating studies of short-term biodiversity and ecological changes with changes in relative sea-level and perturbations in the global carbon cycle. The initial hypothesis to be tested is that these minor extinction events are in several aspects comparable to some of the 'major five' extinction events of the Phanerozoic and are more similar to them than previously believed. This hypothesis has evolved from the growing body of biological and geochemical evidence that Silurian extinction events were global and associated with changes in the global carbon cycle that were of equal or even greater magnitude than those related to the Late Cambrian SPICE event, and the end-Ordovician and Frasnian-Famennian mass extinctions. From an ecological point of view the Silurian events share unexpectedly many characters with the most devastating events of the Palaeozoic (e.g. microbial resurgence and development of anachronistic facies).
Holocene ooids and the significance of ancient calcareous oolites
This project is funded through a small Lund university grant. It focus on the the anatomy and mineralogy of recent and sub-recent ooids in the Bahamas complex and will utilize synchrotron light facilities and LA-ICP-MS to characterize ooids. It also aims to reveal the oceanographic and ecological significance of widespread calcareous oolites that developed in the aftermath of some of the mass extinctions in Earth history. I have the questions but not the answers. Widespread oolite formations in the Palaeozoic clearly signals major ecosystem changes in the marine environment.
Hämtat ur Lunds universitets publikationsdatabas
- Late Ordovician (Katian) spores in Sweden : oldest land plant remains from Baltica
- d(13)C chemostratigraphy in the Lower-Middle Ordovician succession of Oland (Sweden) and the global significance of the MDICE
- delta C-13 chemostratigraphy in the upper Tremadocian through lower Katian (Ordovician) carbonate succession of the Siljan district, central Sweden
- A complete record of the 'Lower' Cambrian-Middle Ordovician succession of Öland, southern Sweden, based on the Tingskullen core
- Chitinozoan biostratigraphy across the Katian (Late Ordovician) GICE event in the Borenshult-1 drillcore (Sweden)
- Ordovician stratigraphy of the Stumsnas 1 drill core from the southern part of the Siljan Ring, central Sweden
- Palaeokarst formation in the early Palaeozoic of Baltoscandia : evidence for significant sea-level changes in a shallow epicontinental sea
- Palynology and sedimentology of the Upper Ordovician-lowermost Llandovery in the Röstånga-1 core, southern Sweden
- Palynostratigraphy of dinosaur footprint-bearing deposits from the Triassic-Jurassic boundary interval of Sweden
- The Drumian Isotopic Carbon Excursion (DICE) in Scania, southern Sweden : a mirror of the onset of the Marjumiid Biomere at a time of increased primary production?
- A new upper Middle Ordovician-Lower Silurian drillcore standard succession from Borenshult in Ostergotland, southern Sweden: 2. Significance of delta C-13 chemostratigraphy
- Biotic dynamics and carbonate microfacies of the conspicuous Darriwilian (Middle Ordovician) 'Taljsten' interval, south-central Sweden
- Geochemical variations within the mid-Silurian Grotlingbo Bentonite (Gotland, Sweden): discriminating between magmatic composition, ash transport fractionation and diagenetic effects
- New Ordovician-Silurian drill cores from the Siljan impact structure in central Sweden: an integral part of the Swedish Deep Drilling Program
- New chemostratigraphic data through the Mulde Event interval (Silurian, Wenlock), Gotland, Sweden
- The Record of Microbially Induced Sedimentary Structures (MISS) in the Swedish Paleozoic
- U-Pb (zircon) age constraints on the timing and duration of Wen lock (Silurian) paleocommunity collapse and recovery during the "Big Crisis"
- Carbonate mud mounds, conglomerates, and sea-level history in the Katian (Upper Ordovician) of central Sweden
- How does sea level correlate with sea-water chemistry? A progress report from the Ordovician and Silurian Preface
- Ordovician and Silurian sea–water chemistry, sea level, and climate: A synopsis
- Palaeoclimate perturbations before the Sheinwoodian glaciation: A trigger for extinctiond during the 'Ireviken Event'
- Palaeokarst evidence for widespread regression and subaerial exposure in the middle Katian (Upper Ordovician) of Baltoscandia: significance for global climate.
- A sequence stratigraphical model for the late Ludfordian (Silurian) of Gotland, Sweden – implications for timing between changes in sea-level, palaeoecology, and the global carbon cycle
- An atypical intra-platform environment and biota from the Silurian of Gotland, Sweden
- Silurian global events - at the tipping point of climate change
- 7.1.2 Stratigrafisk indelning
- A latest Llandovery to latest Ludlow high-resolution biostratigraphy based on the Silurian of Gotland - a summary
- A shoreline to deep basin correlation chart for the middle Silurian coupled extinction-stable isotopic event
- Evidence for rapid environmental changes in low latitudes during the Late Silurian Lau Event: the Burgen-1 drillcore, Gotland, Sweden
- Fanerozoisk berggrund utanför fjällkedjan
- Från kusten till djuphavet
- Geologiska råvaror; metanhydrater
- Silurian research at the crossroads
- The first record of Odontopleura ovata (Trilobita) from Scandinavia: part of a middle Silurian intercontinental shelly benthos mass occurrence
- A Late Silurian extinction event and anachronistic period
- A Late Silurian extinction event and anachronistic period: Comment and Reply.
- Biostratigraphy of Gotland
- Field localities
- Silurian carbonate platforms and extinction events - ecosystem changes exemplified from Gotland, Sweden
- The Baltic basin and the Silurian strata of Gotland, Sweden.
- Late Ordovician palaeoceanographic changes as reflected in the Hirnantian-early Llandovery succession of Jamtland, Sweden
- The Silurian of Gotland - Part II: Guide to the IGCP 503 field meeting 2004.
- Ytterholmen revisited - implications for the Late Wenlock stratigraphy of Gotland and coeval extinctions