Results 21 to 30 of about 1,722,612 (173)

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

Population structure of graptolite assemblages [PDF]

open access: yes, 1998
Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at ...
Underwood, Charlie J.
core   +4 more sources

Late Ordovician bentonite database

open access: yes, 2021
Dataset of all Late Ordovician dates analysed in bentonites.Used in Figure 1 of "Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply" by Longman et al., Nat. Geosci. (2021)
Jack Longman (11081151)
core   +1 more source

A new species of graptolite from the western margin of the Kufra Basin, Libya [PDF]

open access: yes, 2013
Normalograptus kufraensis sp. nov. occurs as monospecific assemblages in the Tanezzuft Formation at the western margin of the Kufra Basin (Jabal Eghei), southern Libya.
Elgardy, Mohamed   +11 more
core   +1 more source

The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden [PDF]

open access: yes, 2013
The late Katian, Late Ordovician Boda Limestone of Dalarna, Sweden contains a rich cephalopod assemblage. The assemblage consists of 61 species, in 31 genera, comprising almost all major Ordovician cephalopod orders.
Kröger, Björn   +3 more
core   +1 more source

The only known cyclopygid–‘atheloptic’ trilobite fauna from North America: the upper Ordovician fauna of the Pyle Mountain Argillite and its palaeoenvironmental significance [PDF]

open access: yes, 2012
The trilobite fauna of the upper Ordovician (middle Katian) Pyle Mountain Argillite comprises a mixture of abundant mesopelagic cyclopygids and other pelagic taxa and a benthic fauna dominated by trilobites lacking eyes.
Bruton, D.L.   +3 more
core   +1 more source

The Truong Son, Loei-Phetchabun, and Kontum Terranes in Indochina: Provenance, Rifting, and Collisions

open access: yesFrontiers in Earth Science, 2021
The three main regions of Indochina are defined as the Truong Son, Loei-Phetchabun, and Kontum terranes. The aim of this review is to integrate numerous petrological studies with sedimentary, palaeontological, and provenance studies in order to construct
Clive Burrett   +3 more
doaj   +1 more source

Ordovician plate tectonic and paleogeographic maps

open access: yes, 2023
Atlas of Ordovician plate tectonic and paleogeographic maps (Late Darriwilian, 460 Ma)
Christopher R. Scotese (6998246)
core   +3 more sources

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