Results 11 to 20 of about 29,816 (231)

Sedimentary Mercury Enrichments as a Tracer of Large Igneous Province Volcanism

open access: yesGeophysical Monograph Series, Page 247-262., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Lawrence M. E. Percival   +3 more
wiley  

+10 more sources

The Irish Ordovician brachiopod fauna: A taxonomic renaissance [PDF]

open access: yesEstonian Journal of Earth Sciences, 2023
Despite its small areal extent, the island of Ireland exposes eight Caledonian tectonic terranes; six of them contain Ordovician brachiopod assemblages. These terranes record the early phases and destruction of the Iapetus Ocean through the occurrence of
David A. T. Harper
doaj   +1 more source

Evolution of prototype basin and change of tectonic-sedimentary pattern in Paleozoic, Ordos Basin

open access: yesShiyou shiyan dizhi, 2022
The Ordos Basin is a craton basin developed based on the Precambrian rift system during Permian. It has experienced two stages of evolution including the Early Paleozoic craton marginal depression and Late Paleozoic intra-craton depression.
Faqi HE, Fubin WANG, Liguo GUO, Chuan AN
doaj   +1 more source

The earliest known stromatoporoid and its contribution to reef construction [PDF]

open access: yesEstonian Journal of Earth Sciences, 2023
Stromatoporoid-type hypercalcified sponges are known to have contributed to the global reef system since the late Middle Ordovician until their major disappearance in the latest Devonian.
Juwan Jeon   +6 more
doaj   +1 more source

The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia [PDF]

open access: yesEstonian Journal of Earth Sciences, 2017
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group.
Olev Vinn, Ursula Toom, Mare Isakar
doaj   +1 more source

The tarphyceratid cephalopod Trocholites in the Middle–Upper Ordovician of the Prague Basin —the Baltican element in peri-Gondwana [PDF]

open access: yesActa Palaeontologica Polonica, 2023
The vast majority of cephalopods of the order Tarphyceratida are known from regions that were located at mid- or low palaeolatitudes during the Ordovician (mainly Baltica, Laurentia, and Chinese palaeoblocks).
Martina Aubrechtová   +2 more
doaj   +1 more source

Late Ordovician Palynomorphs [PDF]

open access: yesJournal of Micropalaeontology, 1985
Abstract. ACRITARCHSOrdovician acritarchs have been recorded in five core samples collected between 2520 ft. and 3000 ft. in Well E1-81, and ten cutting samples taken between 12150 ft. and 13240 ft. in Well J1-81A. All the assemblages recovered are of Late Ordovician age; no Early Ordovician or Middle Ordovician assemblages have been identified ...
Molyneux, S. G., Paris, F.
openaire   +2 more sources

Putative Late Ordovician land plants [PDF]

open access: yesNew Phytologist, 2018
The colonization of early terrestrial ecosystems by embryophytes (i.e. land plants) irreversibly changed global biogeochemical cycles (Berner & Kothavala, 2001; Berner et al., 2007; Song et al., 2012). However, when and how the process of plant terrestrialization took place is still intensely debated (Kenrick & Crane, 1997; Kenrick et al., 2012 ...
Salamon, Mariusz   +11 more
openaire   +4 more sources

Contrasting Early Ordovician assembly patterns highlight the complex initial stages of the Ordovician Radiation

open access: yesScientific Reports, 2022
The Early Ordovician is a key interval for our understanding of the evolution of life on Earth as it lays at the transition between the Cambrian Explosion and the Ordovician Radiation and because the fossil record of the late Cambrian is scarce.
Farid Saleh   +12 more
doaj   +1 more source

Was there more space in the late Early Devonian for marine biodiversity to peak than in the early Late Ordovician?: A brief note [PDF]

open access: yesGeološki Anali Balkanskoga Poluostrva, 2013
After the so-called “Cambrian explosion”, marine biodiversity peaked either in the early Late Ordovician (as shown by the “classical” curves based on the extensive palaeontological data compilation) or in the late Early Devonian (as shown by the
Ruban Dmitry A.
doaj   +1 more source

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