Results 181 to 190 of about 1,517 (200)

Ordovician and Silurian chitinozoan biozones of western Gondwana

Geological Magazine, 2006
A formal Ordovician–Silurian chitinozoan biozonation for western Gondwana is proposed. This palaeogeographic province includes South America, and was located in medium to high latitudes during Ordovician and Silurian times. Ordovician chitinozoans are known from northern Argentina, southern Bolivia, and Brazil.
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The first Silurian chitinozoans from Severnaya Zemlya, Russian Arctic

GFF, 2012
The chitinozoan Conochitina aff. emmastensis Nestor, 1982 has been identified from the Silurian Telychian Stage, Llandovery Series, of Severnaya Zemlya, the Russian Arctic. Its presence suggests an early to late Telychian age for the strata, which is in accordance with previous biostratigraphic dating based on graptolites and conodonts.
Olga K. Bogolepova, Alexander P. Gubanov, Florentin Paris   +2 more
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Ordovician chitinozoan zonation of Quebec and western Newfoundland

Journal of Paleontology, 1989
The purpose of this paper is to propose a chitinozoan zonation of the Ordovician of Quebec and western Newfoundland. On the basis of chitinozoan assemblages previously described from various sections, covering almost the entire Ordovician System, 22 biozones, based on first appearance of index species, are distinguished.
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Aeronian and early Telychian chitinozoans from Central Saudi Arabia

GEO 2008, 2008
Chitinozoan occurrences from three shallow boreholes penetrating the lower Silurian Qusaiba Member in central Saudi Arabia have been calibrated against graptolitebased age control. The age of the graptolite-bearing portion of the Qusaiba Member in the Qusaiba Depression is Aeronian and assigned to the Lituigraptus convolutus Biozone.
Merrell A. Miller, Florentin Paris, Jan Zalasiewicz and Mark Williams   +2 more
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Late Tremadocian chitinozoans and acritarchs from northwestern Argentina (Western Gondwana)

Review of Palaeobotany and Palynology, 2009
Abstract Chitinozoans and acritarchs are recorded from the Saladillo and Parcha formations of the Pascha-Incamayo area (Salta Province), Cordillera Oriental, northwestern Argentina. These organic microfossils coexist with graptolites of the Kiaerograptus , Araneograptus murrayi and Hunnegraptus copiosus biozones of early late Tremadocian and ...
G. Susana de la Puente, Claudia V. Rubinstein   +1 more
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Darriwilian (Middle Ordovician) chitinozoans from the Qaidam Paleoplate, northwest China

Review of Palaeobotany and Palynology, 2018
Abstract The Qaidam Paleoplate is a microcontinent that is currently part of central Asia. Its position during the Ordovician is uncertain, with paleogeographic reconstructions placing it either near South China or near North China. Ordovician microfossils such as chitinozoans have not previously been reported from the Qaidam Paleoplate.
Wenhui Wang, Ran Zhao, Lucy A. Muir, Ming Li, Jingqiang Tan   +4 more
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The Ordovician chitinozoan biozones of the Northern Gondwana domain

Review of Palaeobotany and Palynology, 1990
Abstract A formal biozonation is proposed for the Ordovician chitinozoans of the Northern Gondwana Domain. This palaeogeographic province, located at rather high latitudes during the Ordovician, includes southwestern Europe, central Europe, Middle-East, northern Africa and Florida.
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Application of neural networks for chitinozoans recognition in images

Vestnik of geosciences
Paleontological identification of microfauna using automated image recognition represents an innovative practical application of existing software methods for analysis and classification based on computer vision and machine learning technologies. The development of software capable of recognition of Chitinozoans in images will simplify and speed up the
R. Yakupov, K. Gusmanova
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Aeronian and Telychian chitinozoans from Central Saudi Arabia.

2008
A total of 58 core samples from three shallow core holes (Qusaiba-1, Baq'a-3 and Baq'a-4) penetrating the Qalibah Formation in Central Saudi Arabia have been investigated. The core samples are grey-greenish hemipelagic shale or silty-shale and yield very well-preserved and abundant Early Silurian chitinozoans.
Paris, Florentin, Miller, Merrell, Al-Hajri, Sa'Id, Zalasiewicz, Jan, Williams, Mark   +4 more
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Palaeobiological significance of chitinozoan clusters with parallel vesicles

Marine Micropaleontology, 2022
Jakub Vodička, Lucy A. Muir, Joseph P. Botting, Václav Špillar, Oldřich Fatka   +4 more
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