Results 61 to 70 of about 893 (201)
Papers in Palaeontology, Volume 11, Issue 2, March/April 2025.Abstract A new exceptionally preserved euarthropod, Keurbos susanae gen. et sp. nov. from the Upper Ordovician Soom Shale Konservat‐Lagerstätte of South Africa, is described herein. Two specimens exhibit an unusual preservation style such that the cuticular exoskeleton is preserved in low relief but retains high‐fidelity details, whereas the internal ...
Sarah E. Gabbott +3 more
wiley +1 more source
, 1992 Faunas of disarticulated ossicles, particularly columnals, are a potentially important source of data for helping to elucidate the patterns of evolution and extinction shown by pelmatozoans in the late Ordovician.
D. A. T. Harper, S. K. Donovan
core +1 more source
Late Ordovician ironstone and its relation to ocean redox instability, climate and glaciation
Sedimentology, Volume 72, Issue 2, Page 631-665, February 2025.Abstract The Upper Ordovician (Katian) Neda Formation, a phosphatic ironstone, records a widespread but short‐lived shift to ferruginous waters across a vast epicontinental area. Lithofacies and stratigraphic reappraisal indicate that Neda ironstone deposition occurred on a storm‐dominated ramp when coastal upwelling emplaced eutrophic ferruginous ...
Edward J. Matheson +3 more
wiley +1 more source
δ13C chemostratigraphy of the Middle and Upper Ordovician succession in the Tartu-453 drillcore, southern Estonia, and the significance of the HICE [PDF]
Estonian Journal of Earth Sciences, 2014 The δ13C isotope data from the Tartu-453 core section in southern Estonia enabled creation of a continuous Ordovician carbon isotope record, ranging from the Floian to the end of the Hirnantian.
Heikki Bauert +3 more
doaj +1 more source
Island Arc, Volume 34, Issue 1, January/December 2025.ABSTRACT An ostracod assemblage from the Late Ordovician (Katian) Phu Ngu Formation of northern Vietnam, South China paleoplate, yields typical Baltic and Laurentian‐affinity genera together with some endemic forms. Detailed paleontological and sedimentary analysis of the Phu Ngu Formation suggests it was deposited in a deeper marine forearc setting ...
Anna McGairy +9 more
wiley +1 more source
An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia [PDF]
Silicified brachiopods from Hirnantian strata in three sections of the lower Whittaker Formation, Mackenzie Mountains, northwestern Canada, yielded a moderately diverse, Edgewood-type Hirnantian fauna, consisting of 13 species: Biparetis paucirugosus ...
Jin, Jisuo, Harper, David A.T.
core +1 more source
Solid Earth Carbon Degassing and Sequestration Since 1 Billion Years Ago
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.Abstract Solid Earth CO2 outgassing, driven by plate tectonic processes, is a key driver of carbon cycle models. However, the magnitudes and variations in outgassing are poorly constrained in deep‐time. We assess plate tectonic carbon emissions and sequestration by coupling a plate tectonic model with reconstructions of oceanic plate carbon reservoirs ...
R. Dietmar Müller +7 more
wiley +1 more source
, 2023 Based on a new deep drilling on southern Gotland (Sweden), this study is the first to document the carbon isotope chemostratigraphy of the Upper Ordovician through lowermost Silurian sedimentary record from the central parts of the Baltic Sea subsurface.
Lehnert, Oliver +6 more
core +1 more source
New data on acritarchs from the Upper Ordovician of the Tungus basin, Siberian Platform [PDF]
Estonian Journal of Earth Sciences, 2014 Distinctive late Ordovician acritarch assemblages have been discovered for the first time from about a 100 m sedimentary succession exposed along the Bol¢shaya Nirunda River in Siberia.
Elena Raevskaya, Andrei Dronov
doaj +1 more source
Bioturbators as ecosystem engineers in space and time
Palaeontology, Volume 67, Issue 6, November/December 2024.Abstract Biogenic sedimentary structures offer a unique perspective for understanding the role of the biosphere in the interaction with other Earth subsystems and the building up of our planet. The record of their ancient equivalents provides a wealth of information for reconstructing the role of bioturbators as ecosystem engineers using multiple ...
M. Gabriela Mángano +3 more
wiley +1 more source