Results 71 to 80 of about 1,764 (217)
Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: Sedimentary and geochemical controls on the Ireviken Event in a deep marine setting [PDF]
, 2016 The stratigraphic variability and geochemistry of Llandovery/Wenlock (L/W) Series boundary sediments in Poland reveals that hemipelagic sedimentation under an anoxic/euxinic water column was interrupted by low density bottom currents or detached diluted ...
Bond, David P. G. +3 more
core +1 more source
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
The late Ordovician Soom Shale Lagerstȁtte: an extraordinary post-glacial fossil and sedimentary record [PDF]
, 2016 Fossils of the Late Ordovician Soom Shale Lagerstätte are characterized by exceptional preservation of their soft tissues in clay minerals. The low-diversity community lived in an unusual cold-water setting, dominated by anoxic bottom waters, in the ...
Browning, Claire +3 more
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
High potential for weathering and climate effects of non-vascular vegetation in the Late Ordovician [PDF]
, 2016 It has been hypothesized that predecessors of today’s bryophytes significantly increased global chemical weathering in the Late Ordovician, thus reducing atmospheric CO2 concentration and contributing to climate cooling and an interval of glaciations ...
A Boucot +60 more
core +3 more sources
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
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
Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations [PDF]
Journal of the Geological Society, 2015 The limestones of the upper Katian Boda mud mounds (Ordovician) of the Siljan district in central Sweden are deeply fractured. The fissures were partly synsedimentary and are often lined with stromatolite-like crusts. These crusts thus far are the only known subaerial Ordovician speleothems.
Kröger, Björn +6 more
openaire +2 more sources