Article
Biology
Deng Wang, Jean Vannier, Cedric Aria, Jie Sun, Jian Han
Summary: This study explores the paleobiology of tube-dwelling worms, focusing on Selkirkia fossils from the Chengjiang Lagerstatte in China. The research reveals Selkirkia as a stem-group priapulid, capable of movement inside its protective tube. The presence of brachiopod epibionts suggests a potential ecological relationship and evolutionary significance of tube-dwelling in early Cambrian animals.
Article
Geosciences, Multidisciplinary
Xiao-yu Yang, Jean Vannier, Jie Yang, Deng Wang, Xi-guang Zhang
Summary: Researchers have discovered egg clusters of the tube-dwelling priapulid worm from the Cambrian period, providing insights into the unchanged structure of female tubular gonads over half a billion years. These findings offer key information on the reproductive organs and strategies of early ecdysozoans, shedding light on the significance of ecology in the reproductive strategies and lifestyles of modern and Cambrian worms.
GEOSCIENCE FRONTIERS
(2021)
Article
Geochemistry & Geophysics
Daniele Thallner, Andrew J. Biggin, Phil J. A. McCausland, Roger R. Fu
Summary: The research indicates that during the Ediacaran period, the geomagnetic field exhibited anomalous directions, high reversal frequencies, and ultra-low field strength. The findings suggest that the geomagnetic field may have transitioned to a stronger, more dipole-dominated state at the Ediacaran-Cambrian boundary.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Noel C. Shembilu, Karem Azmy
Summary: The study utilized multiple proxies to analyze the productivity, weathering products input, and paleoredox conditions of the Middle-Upper Cambrian carbonates. Positive shifts in certain geochemical profiles were associated with sea level falls and increased weathering activities, indicating changes in redox state.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Noel Shembilu, Karem Azmy
Summary: The studied interval at the Belle Isle Strait in western Newfoundland spans the Middle-Upper Cambrian, consisting of dolomitized shallow-water carbonates. Multiple techniques confirmed the preservation of investigated micritic carbonates, with delta C-13 values allowing for the construction of a high-resolution, reliable global correlation profile. Two major negative excursions in the delta C-13 profile are likely linked to short-term sea level changes according to trilobite biozonation schemes.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
John S. Peel
Summary: This study reports the first finding of the Cambrian mollusc Pseudomyona in Laurentia. Fossils of the type species Pseudomyona queenslandica from Australia and northern Siberia were described from North Greenland. A new species, Pseudomyona groenlandica, characterized by hinge teeth on the supra-apical surface, was identified in southeast Freuchen Land. The increase in hinge teeth supports the hypothesis of Tuarangia evolving from Pseudomyona.
BULLETIN OF GEOSCIENCES
(2021)
Article
Geosciences, Multidisciplinary
John S. Pell
Summary: The bivalved calcareous shells of stenothecoids are generally asymmetrical and uneven and are found in lower and middle Cambrian strata. Their classification as a separate class of Mollusca or within the stem-group of Brachiopoda is still unresolved. The description of pedicle attachment in stenothecoids from North Greenland supports the latter classification. The study of material from North Greenland reveals insights into the morphology of stenothecoids, although comparisons with other localities are challenging due to high variability. New species Stenothecoides terraglaciei sp. nov. is described in this study.
BULLETIN OF GEOSCIENCES
(2021)
Article
Geosciences, Multidisciplinary
John S. Peel
Summary: A phosphatised specimen from North Greenland is interpreted as the hatching larva of a primitive priapulid worm, revealing similarities in the ontogeny between Cambrian priapulid worms and their modern relatives.
BULLETIN OF GEOSCIENCES
(2022)
Article
Geology
Kirsten L. Rasmussen, Hendrik Falck, Vanessa Elongo, Jesse Reimink, Yan Luo, D. Graham Pearson, Luke Ootes, Robert A. Creaser, Pilar Lecumberri-Sanchez
Summary: The Tungsten Plutonic Suite (TPS) in the northern Canadian Cordillera is an important source of tungsten resources, but the origins of the magmas that formed these rocks have not been identified. Through the study of detrital zircon, it is suggested that sedimentary rocks in the Selwyn Basin are the likely source of the TPS magmas. This finding has implications for understanding the crustal architecture in the region.
Article
Geology
Kirsten L. Rasmussen, Hendrik Falck, Vanessa Elongo, Jesse Reimink, Yan Luo, D. Graham Pearson, Luke Ootes, Robert A. Creaser, Pilar Lecumberri-Sanchez
Summary: The Tungsten Plutonic Suite (TPS) in the northern Canadian Cordillera is responsible for important tungsten resources, but the actual source rocks have not been identified. Detrital zircon studies and U-Pb analysis of inherited zircon cores in the TPS suggest that late Cambrian sedimentary rocks in the Selwyn Basin are the most likely source for these magmas. The presence of world-class tungsten mineralization is limited to a narrow belt of TPS plutons near the ancient continental margin.
Article
Geochemistry & Geophysics
Daniele Thallner, Andrew J. Biggin, Henry C. Halls
Summary: Long-term variations of the geomagnetic field, particularly during the Ediacaran period, provide insights into the evolution of Earth's deep interior. Palaeointensity data from the Grenville Dykes suggest the presence of an equatorial dipole in the geomagnetic field around 585 Ma.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Barra A. Peak, Rebecca M. Flowers, Francis A. Macdonald
Summary: The Great Unconformity erosion surface between Paleozoic sedimentary rocks and Archean-Proterozoic basement has been explained by multiple factors including glacial erosion during Snowball Earth glaciations, sea level fluctuations, and tectonic and geodynamic mechanisms. New data from zircon and apatite (U-Th)/He thermochronology show that there was extensive exhumation in the study area between approximately 590-577 Ma and 470 Ma, suggesting that tectonic and geodynamic processes were the main causes of the Great Unconformity. These findings expand our understanding of the spatial extent of exhumation in the Canadian Shield and suggest that glacial and sea-level processes were not the primary drivers.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Paleontology
Stephen R. Westrop, Alyce A. Dengler
Summary: A new fossil species of Catillicephala, C. cifellii, is discovered from the mid-Cambrian margin of Laurentian North America. It is among the oldest representatives of the genus, dating back to the early Guzhangian period.
ACTA PALAEONTOLOGICA POLONICA
(2022)
Article
Acoustics
Simone K. A. Videsen, Malene Simon, Mark Johnson, Peter Teglberg Madsen, Fredrik Christiansen
Summary: The research shows that feeding humpback whales in Greenland produce low level and infrequent calls, suggesting that calling is not necessary for successful feeding and may instead serve to mediate social interactions within the group.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Editorial Material
Biochemistry & Molecular Biology
Joanna M. Wolfe, Javier Ortega-Hernandez
Summary: Developmental gene expression indicates a hidden subdivision of the anterior brain in arthropods. A new study reveals intricate details of the nervous system from well-preserved 500-million-year-old Chinese fossils, providing evidence for the bipartite origin of the anterior brain among Cambrian representatives.
Article
Paleontology
John S. Peel
JOURNAL OF PALEONTOLOGY
(2019)
Article
Paleontology
John S. Peel, Sebastian Willman, Stig A. Schack Pedersen
Article
Paleontology
Gerd Geyer, John S. Peel
JOURNAL OF PALEONTOLOGY
(2020)
Article
Paleontology
John S. Peel, Sebastian Willman, Steven J. Hageman
JOURNAL OF PALEONTOLOGY
(2020)
Article
Geosciences, Multidisciplinary
John S. Peel
Summary: This study details trilobite assemblages in western North Greenland of middle Cambrian age, correlating with formations in parts of the USA. Four biozones are identified, with the discovery of new biozones and species. This research contributes to the understanding of trilobite evolution and biostratigraphy in the region.
BULLETIN OF THE GEOLOGICAL SOCIETY OF DENMARK
(2021)
Article
Paleontology
Elise Wallet, Ben J. Slater, Sebastian Willman, John S. Peel
Summary: The Sirius Passet Lagerstatte in North Greenland is one of the oldest records of soft-bodied metazoan-dominated ecosystems from the early Cambrian. Recent discoveries have expanded the known coverage of organic preservation into shallower water depositional settings, revealing a rich diversity of non-mineralizing metazoans.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Paleontology
John S. Peel
Summary: An assemblage of 50 species of small shelly fossils is described from Cambrian Series 2 (Stage 4) strata in North Greenland, providing insights into the diverse marine fauna present in the sediment-starved outer ramp setting. The fossils include unique taxa with a potentially worldwide distribution.
JOURNAL OF PALEONTOLOGY
(2021)
Article
Paleontology
John S. Peel, Christian B. Skovsted, Elise Wallet
Summary: Tuberculate fragments of Nikolarites spasskyi are compared with Spinospitella in North Greenland, showing different ecological control of distribution. Nikolarites spasskyi occur in reworked higher-energy deposits, while Spinospitella characterise deeper-water mudstones. The mutually exclusive occurrences of the two taxa suggest ecological factors shaping their distribution in North Greenland.
Article
Paleontology
John S. Peel, Sebastian Willman
Summary: The study on paleobiology in northern Greenland discovered fossil records of filamentous cavity-dwelling microorganisms in early Paleoproterozoic and Neoproterozoic strata, but the mineral encrustation obscures their biological identities.
JOURNAL OF PALEONTOLOGY
(2022)
Article
Paleontology
Sebastian Willman, John S. Peel
Summary: This article describes two rare, phosphatized, tubular microfossils, possibly algae, found in the Portfjeld biota of North Greenland. One of them, a new genus and species called Portfjeldia aestatis, shows morphology similarities to the larger Ramitubus from the Weng'an biota in South China. Additionally, an unnamed long tubular structure, occupying the cavity of a mineralized cyanobacterium Jiangispirellus, was also discovered.
JOURNAL OF PALEONTOLOGY
(2022)
Article
Geosciences, Multidisciplinary
John S. Peel, Artem Kouchinsky
Summary: This paper describes the diverse assemblages of helcionelloid molluscs and mollusc-like microfossils found in the upper Henson Gletscher Formation in North Greenland. These fossils show similarities to a similar-aged assemblage from the Coonigan Formation in Australia, with differences in preservation. Detailed impressions of the inner surface of the shell and unique structures were observed in the internal moulds. Several new taxa were also discovered through this research.
BULLETIN OF THE GEOLOGICAL SOCIETY OF DENMARK
(2022)
Article
Paleontology
John S. Peel
Summary: Two new genera of helcionelloid molluscs, Hensoniconus and Vendrascospira, are described from the Henson Gletscher Formation in North Greenland. These fossils exhibit two patterns of muscle scars, located on the dorso-lateral and sub-apical surfaces. Comparison of these fossils suggests that the simple shell form may hinder the recognition of distinct lineages in Cambrian univalves based on anatomical features.
Article
Geology
Jan Ove R. Ebbestad, Peter Cederstrom, John S. S. Peel
Summary: Three cases of repaired injuries and malformation in the helcionelloid mollusc Helcionella antiqua document some of the oldest known attacks on Palaeozoic molluscs. The injuries were caused by failed predatory attacks and resulted in clefts and embayments in the shell. The frequency of shell repair was 1.2% and occurred mostly in larger size classes, indicating a potential targeting of the head region by the attackers.
Article
Biology
Jan Ove R. Ebbestad, Peter Cederstroem, John S. Peel
Summary: Helcionelloid molluscs from the Gislov Formation in southern Sweden are studied. Seven species are identified, with the majority found in the 2-3 mm size range. The study validates the morphological transitions and ontogenetic connections between juveniles and adults. The distribution analysis suggests a close similarity between the Gislov assemblage and the Evjevik Member in Norway.
HISTORICAL BIOLOGY
(2023)
Article
Biology
Sebastian Willman, John S. Peel, Jon R. Ineson, Niels H. Schovsbo, Elias J. Rugen, Robert Frei
COMMUNICATIONS BIOLOGY
(2020)
