Results 141 to 150 of about 2,004 (204)

Facies Patterns and Conodont Biogeography in Arctic Alaska and the Canadian Arctic Islands: Evidence against Juxtaposition of These Areas during Early Paleozoic Time [PDF]

, 2000
Bradley, D. C., de Freitas, T. A., Dumoulin, J. A., Harris, A. G.   +3 more
core  

Some of the next articles are maybe not open access.

Related searches:

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.
R. Yakupov, K. Gusmanova
semanticscholar   +2 more sources

Darriwilian (Middle Ordovician) chitinozoans from the Qaidam Paleoplate, northwest China

Review of Palaeobotany and Palynology, 2018
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.
Wenhui Wang, Ran Zhao, L. Muir, Ming Li, Jingqiang Tan   +4 more
semanticscholar   +2 more sources

Peri-Gondwanan Acritarchs and Chitinozoans from the Lower–Middle Ordovician Lashkarak Formation in the Alborz Mountain Ranges, Northern Iran: Regional Stratigraphical Significance and Palaeogeographical Implications

Palynology, 2023
The Lashkarak Formation (Lower–Middle Ordovician) in the Gerdkuh locality, 10 km west of Damghan city, northern Iran, has been found to contain acritarchs and chitinozoans.
M. Ghavidel-syooki, Mohammad Hossein Piri-Kangarshahi   +1 more
semanticscholar   +1 more source

Ordovician Chitinozoans of the Miaopo Formation at Zhenjin, Upper Yangtze Platform, South China

Palynology, 2023
Chitinozoan investigations on the late Middle to early Late Ordovician in South China are limited. Documented chitinozoan occurrences are mainly from the Miaopo Formation on the Upper Yangtze Platform.
Yan Liang, J. Nõlvak, O. Hints
semanticscholar   +1 more source

Biostratigraphy of acritarchs, chitinozoans, and miospores from Upper Ordovician sequences in Kuh-e Boghou, southwest of Kashmar, eastern central Iran: Stratigraphic and paleogeographic implications

, 2021
A siliciclastic succession is well exposed at Kuh-e Boghou, located in eastern-central Iran. To verify the exact age and paleogeographic position of this section of the Iranian Platform, a detailed, high-resolution palynological analysis of the Ghelli ...
M. Ghavidel-syooki, Mohammad Hossein Piri-Kangarshahi   +1 more
semanticscholar   +1 more source

A revised chitinozoan classification

Journal of Paleontology, 1999
The successful definition of chitinozoan genera depends primarily on the precision of the criteria used. A standardized morphological terminology based upon details from scanning electron microscope observations of the most representative taxa bearing these characters is therefore proposed.
Florentin Paris, Yngve Grahn, Viiu Nestor, Iskra Lakova   +3 more
openaire   +1 more source

Chitinozoans with “skirt”: Ultrastructure and palaeoecological implications of carina in Cyathochitina Eisenack, 1955

, 2021
Carina, a sharp extension of the basal margin in some chitinozoans recalling a “skirt”, is a primary character used for classifying chitinozoans at the genus level. However, little is known about this structure. In this study, we present new observations
Wenhui Wang, Yan Liang, Qiao Lyu, O. Hints, Shefa Chen, J. Nõlvak   +5 more
semanticscholar   +1 more source

Ordovician chitinozoan zones from Baltoscandia

Review of Palaeobotany and Palynology, 1993
On the basis of reports published over the last 60 years, and unpublished data, a chitinozoan zonation is proposed for the Ordovician sequence of Scandinavia, the East Baltic, northeast Poland and Podolia—commonly referred to a Baltoscandia. From the first chitinozoans in the latest Tremadoc to the latest Ashgill (a period comprising ca.
Jaak Nõlvak, Yngve Grahn
openaire   +1 more source

Ordovician chitinozoan diversification events in China

Science in China Series D: Earth Sciences, 2004
Correlative study of the Ordovician chitinozoan biostratigraphy in China with graptolite and conodont biozones, and comprehensive analysis of the sequence- and event-strati-graphic indicated that 17 chitinozoan zones and 5 main chitinozoan diversification events subsequently occurring could be recognized in the Ordovician System of China.
Xiaofeng Wang, Xiaohong Chen
openaire   +1 more source