Results 1 to 10 of about 8,458 (202)

Upper Norian conodonts from the Baoshan block, western Yunnan, southwestern China, and implications for conodont turnover [PDF]

PeerJ, 2023
The Sevatian of the late Norian is one of the key intervals in biotic turnover and in changes of paleoclimate and paleoenvironments. Conodont faunas recovered from two sections of upper Norian strata of the Dashuitang and Nanshuba formations near Baoshan
Weiping Zeng, Haishui Jiang, Yan Chen, James Ogg, Muhui Zhang, Hanxinshuo Dong   +5 more
doaj   +3 more sources

X-ray nanotomography and electron backscatter diffraction demonstrate the crystalline, heterogeneous and impermeable nature of conodont white matter [PDF]

Royal Society Open Science, 2021
Conodont elements, microfossil remains of extinct primitive vertebrates, are commonly exploited as mineral archives of ocean chemistry, yielding fundamental insights into the palaeotemperature and chemical composition of past oceans.
Ayse Atakul-Özdemir, Xander Warren, Peter G. Martin, Manuel Guizar-Sicairos, Mirko Holler, Federica Marone, Carlos Martínez-Pérez, Philip C. J. Donoghue   +7 more
doaj   +2 more sources

Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry [PDF]

Royal Society Open Science, 2020
X-ray diffraction data from Silurian conodonts belonging to various developmental stages of the species Dapsilodus obliquicostatus demonstrate changes in crystallography and degree of nanocrystallite ordering (mosaicity) in both lamellar crown tissue and
Mohammad Shohel, Neo E. B. McAdams, Bradley D. Cramer, Tori Z. Forbes   +3 more
doaj   +2 more sources

Discriminating conodont recording bias: a case study from the Nanzhang-Yuan’an Lagerstätte [PDF]

PeerJ
The Early Triassic Nanzhang-Yuan’an Lagerstätte of Hubei Province, South China, preserves abundant marine reptiles in the uppermost part of the Jialingjiang Formation and provides detailed insights into marine organisms, including newly discovered and ...
Kui Wu, Boyong Yang, Bi Zhao, Liangzhe Yang, Yarui Zou, Gang Chen, Jiangli Li   +6 more
doaj   +3 more sources

Middle–Late Devonian conodont fauna of the Bahram Formation in the Shahzadeh Mohammad section, North of Kerman [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2021
Devonian deposits of the Bahram Formation with a thickness of 300 m were studied based on conodont fauna in Shahzadeh Mohammad section (33 km east of Zarand, 95 km north of Kerman city) in central Iran structural Zone.
Fattaneh Zamani, Mehdi Yazdi, Ali Bahrami, Hameh Ameri, Cathrin Girard, Claudia Spalletta   +5 more
doaj   +1 more source

Ordovician conodonts of the Katkoyeh formation in the Kuh-e-Bonorg section, Kalmard Horst (west of Tabas) [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2020
In this research, Ordovician conodonts obtained from the sedimentary succession of the informal Katkoyeh formation is studied in a stratigraphic section at the south of Kuh-e-Bonorg, eastern flank of Kalmard Anticline in the west of Tabas (Central Iran).
Mohammad Nezhadabbas, Abbas Ghaderi, Hadi Jahangir, Ali Reza Ashouri   +3 more
doaj   +1 more source

Biostratigraphy, biofacies, and palaeoecology of the Upper Devonian deposits (Khoshyeilagh Formation) based on conodonts in the northeast of Iran (around Bojnord and Jajarm) [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2021
In this study, the paleoecology, biostratigraphy, and biofacies of the Khoshyeilagh Formation hve been evaluated based on the found conodont species. The Khoshyeilagh Formation includes terrigenous-carbonate sequences, which contain conodonts of shallow ...
Fatemeh Jafarbeigloo, Mahmoudreza Majidifard, Bahaeddin Hamdi, Afshin Asghari, Mehran Arian   +4 more
doaj   +1 more source

Using chemostratigraphy and biostratigraphy methods to define the unconformity underlying the Upper Ordovician Pagoda Formation in the Upper Yangtze Platform

Frontiers in Earth Science, 2023
The discovery of hydrocarbon in the Pagoda Formation in South China has received attention from the petroleum industry. This research paper identifies the discontinuity surface underlying the Pagoda Formation.
Xueying Ma, Shenghui Deng, Yuanzheng Lu, Ru Fan, Fenglian Zhang, Yanqi Sun, Xu Li, Zhengyang Qu   +7 more
doaj   +1 more source

The detailed Middle to early Late Ordovician faunal succession and δ13Ccarbon chemistry of the Kårehamn drill core, offshore eastern Öland, Sweden: implications for stratigraphy and correlation [PDF]

Estonian Journal of Earth Sciences, 2023
The Middle to lower Upper Ordovician stratigraphy of the Kårehamn core, drilled ca 7 km offshore to the east of the Kårehamn village, northeastern Öland, is presented. The investigated core is one of four drill cores obtained during the preparation of
Svend Stouge, Gabriella Bagnoli, Garmen Bauert, Heikki Bauert, Christian M. Ø. Rasmussen   +4 more
doaj   +1 more source

Automatic identification of conodont species using fine-grained convolutional neural networks

Frontiers in Earth Science, 2023
Conodonts are jawless vertebrates deposited in marine strata from the Cambrian to the Triassic that play an important role in geoscience research. The accurate identification of conodonts requires experienced professional researchers. The process is time-
Xiong Duan, Xiong Duan
doaj   +1 more source