Sebastian Willman
YOU?
Author Swipe
View article: Experimental Mineralisation of a Filamentous Hydrogenotrophic Methanogen in Carbonate, Phosphate, and Silicate
Experimental Mineralisation of a Filamentous Hydrogenotrophic Methanogen in Carbonate, Phosphate, and Silicate Open
Methanogenic archaea were likely among the earliest organisms to populate the Earth, perhaps contributing to the Archaean greenhouse effect; they are also widely discussed as analogues to any potential life on Mars. However, fossil evidenc…
View article: Lithostratigraphy of the Portfjeld Group (Ediacaran – lowermost Cambrian) of North Greenland
Lithostratigraphy of the Portfjeld Group (Ediacaran – lowermost Cambrian) of North Greenland Open
The Portfjeld Formation, as originally defined, is the lowermost lithostratigraphic unit of the mainly Lower Palaeozoic Franklinian Basin in southern Peary Land, central North Greenland. The unit crops out semi-continuously from Valdemar G…
View article: The palaeobiological significance of clustering in acritarchs: a case study from the early Cambrian of North Greenland
The palaeobiological significance of clustering in acritarchs: a case study from the early Cambrian of North Greenland Open
Aggregated clusters of acritarchs are relatively common among assemblages of organic‐walled microfossils, yet such associations have received relatively little attention. Here we report a new diversity of acritarch clusters from the early …
View article: Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity
Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity Open
The early Cambrian Buen Formation (North Greenland) hosts an exceptionally rich fossil biota that has contributed significantly to our knowledge of early metazoans, yet the fossil remains of primary producers from this deposit have receive…
View article: Learning and the concept of stratigraphy
Learning and the concept of stratigraphy Open
View article: Organic-walled microfossils from the Lower Cambrian of North Greenland: a reappraisal of diversity
Organic-walled microfossils from the Lower Cambrian of North Greenland: a reappraisal of diversity Open
The early Cambrian Buen Formation (North Greenland) hosts an exceptionally rich fossil biota that has contributed significantly to our knowledge of early metazoans, yet the fossil remains of primary producers from this deposit have receive…
View article: Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity
Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity Open
The early Cambrian Buen Formation (North Greenland) hosts an exceptionally rich fossil biota that has contributed significantly to our knowledge of early metazoans, yet the fossil remains of primary producers from this deposit have receive…
View article: Problematic tubular fossils from the Portfjeld Formation (Ediacaran) of North Greenland
Problematic tubular fossils from the Portfjeld Formation (Ediacaran) of North Greenland Open
Two rare, phosphatized, tubular microfossils of uncertain affinity, probably algal, are described from the Portfjeld biota (Ediacaran) of North Greenland. Portfjeldia aestatis n. gen. n. sp. preserves two tubules, one of which branches, wi…
View article: Morphometric analysis of<i>Skiagia</i>-plexus acritarchs from the early Cambrian of North Greenland: toward a meaningful evaluation of phenotypic plasticity
Morphometric analysis of<i>Skiagia</i>-plexus acritarchs from the early Cambrian of North Greenland: toward a meaningful evaluation of phenotypic plasticity Open
The Cambrian evolutionary radiations are marked by spectacular biotic turnovers and the establishment of increasingly tiered food chains. At the base of these food chains are primary producers, which in the Cambrian fossil record are chief…
View article: Experimental fossilisation of two strains of methanogen, <i>Methanoculleus bourgensis </i>MAB-2 and <i>Methanobacterium oryzae</i> in silicates, carbonates, and phosphates
Experimental fossilisation of two strains of methanogen, <i>Methanoculleus bourgensis </i>MAB-2 and <i>Methanobacterium oryzae</i> in silicates, carbonates, and phosphates Open
Mineralization has long been considered a prime mechanism for fossilising organisms at cellular level with a high degree of precision.Rapid entombment of microbes in minerals is often essential for their long-term preservation since it red…
View article: Cavity-dwelling microorganisms from the Ediacaran and Cambrian of North Greenland (Laurentia)
Cavity-dwelling microorganisms from the Ediacaran and Cambrian of North Greenland (Laurentia) Open
Records of diagenetically mineralized, filamentous, cavity-dwelling microorganisms extend back to strata from the early Paleoproterozoic (2400 Ma). In North Greenland (Laurentia), they are first known from the Ediacaran (Neoproterozoic; ca…
View article: Late Ediacaran organic microfossils from Finland
Late Ediacaran organic microfossils from Finland Open
Here we present a detailed accounting of organic microfossils from late Ediacaran sediments of Finland, from the island of Hailuoto (northwest Finnish coast), and the Saarijärvi meteorite impact structure (~170 km northeast of Hailuoto, ma…
View article: Small carbonaceous fossils (<scp>SCF</scp>s) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments
Small carbonaceous fossils (<span>SCF</span>s) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments Open
The Sirius Passet Lagerstätte of North Greenland is one of the oldest records of soft‐bodied metazoan‐dominated ecosystems from the early Cambrian. The Lagerstätte site itself is restricted to just a single c . 1‐km‐long outcrop located of…
View article: Ediacaran Doushantuo-type biota discovered in Laurentia
Ediacaran Doushantuo-type biota discovered in Laurentia Open
View article: The oldest hyolithids (Cambrian Series 2, Montezuman Stage) from the Iapetan margin of Laurentia
The oldest hyolithids (Cambrian Series 2, Montezuman Stage) from the Iapetan margin of Laurentia Open
The recent description of the nevadioid trilobite Buenellus chilhoweensis Webster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, …
View article: Unusual preservation of an Ordovician (Floian) arthropod from Peary Land, North Greenland (Laurentia)
Unusual preservation of an Ordovician (Floian) arthropod from Peary Land, North Greenland (Laurentia) Open
View article: The Ediacaran–Cambrian transition: the emerging record from Small Carbonaceous Fossils (SCFs)
The Ediacaran–Cambrian transition: the emerging record from Small Carbonaceous Fossils (SCFs) Open
The Ediacaran–Cambrian transition: the emerging record from Small Carbonaceous Fossils (SCFs)
View article: A Tonian age for the Visingsö Group in Sweden constrained by detrital zircon dating and biochronology: implications for evolutionary events
A Tonian age for the Visingsö Group in Sweden constrained by detrital zircon dating and biochronology: implications for evolutionary events Open
Detrital zircon U–Pb ages from samples of the Neoproterozoic Visingsö Group, Sweden, yield a maximum depositional age of ≤ 886±9 Ma (2σ). A minimum depositional age is established biochronologically using organic-walled and vase-shaped mic…