Results 61 to 70 of about 1,952 (183)

First report of an aulaceratid stromatoporoid from the Ordovician of Baltica [PDF]

Estonian Journal of Earth Sciences
The aulaceratid stromatoporoids first appeared in the late Middle Ordovician and had achieved a worldwide distribution in tropical to subtropical shallow-marine environments by the Late Ordovician; however, their presence in Baltica has not been ...
Juwan Jeon, Ursula Toom
doaj   +1 more source

Inferring Cenozoic Cover Thickness and Bedrock Sedimentary Material in 3D From Geophysical Data Using Machine Learning Algorithms: A Case Study in the Lockington Region, Victoria, Australia

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract This study presents a supervised machine learning approach to constructing a 3D geological model for the Lockington area in Victoria, Australia, by integrating borehole observations, geophysical surveys (magnetic, gravity, and radiometric), and elevation data.
Limin Xu, Eleanor C. R. Green, Mark A. McLean   +2 more
wiley   +1 more source

The Paleo‐Tethys Suture Zone in the Afghan Hindu Kush‒Pamir: Geo‐Thermochronology, Geochemistry, Tectonics

Tectonics, Volume 45, Issue 3, March 2026.
Abstract In the Afghan Hindu Kush, the 223–209 Ma (≤800°C) Salang batholith is part of the Silk‐Road magmatic arc that was built on ∼40‐km‐thick Turan‐Karakum block continental crust. The batholith constitutes the hanging wall of the Herat‐Panjshir‐Badakhshan—the Paleo‐Tethys—suture zone, vestige of the subducted Paleozoic‐early Mesozoic Paleo‐Tethys ...
Lothar Ratschbacher, Said Amin Hashimy, Hasan Malistani, Yasuhito Osanai, Jianhua Li, Zhao Yang, Bradley R. Hacker, Leander Franz, Hadi Karimi   +8 more
wiley   +1 more source

Carbon isotopic compositions and origin of Paleozoic crude oil in the platform region of Tarim Basin, NW China

Petroleum Exploration and Development, 2017
Based on the carbon isotopic compositions of Cambrian-Ordovician source rocks Kerogen Samples and Paleozoic crude oil in the platform region of Tarim Basin, the origin and source of Paleozoic crude oil were investigated.
Xinjian ZHU, Jianfa CHEN, Jianjun WU, Yifan WANG, Baoshou ZHANG, Ke ZHANG, Liwen HE   +6 more
doaj   +1 more source

Depositional Interplay Between the Ancestral Rocky Mountains and Ouachita–Marathon–Sonora Orogenies: Insights From Provenance Records in the Late Palaeozoic Marfa Basin, West Texas, USA

Basin Research, Volume 38, Issue 2, March/April 2026.
Provenance records from the late Palaeozoic Marfa Basin in West Texas reveal the transition from the Ancestral Rocky Mountains to the Ouachita–Marathon–Sonora orogenies during the early Permian in SW Laurentia. ABSTRACT The Marfa Basin in West Texas is a late Palaeozoic synorogenic depocenter associated with regional deformation linked to the Ancestral
Sandra Juárez‐Zúñiga, Daniel F. Stockli, Benjamin Johnson, Timothy F. Lawton   +3 more
wiley   +1 more source

Late Ordovician cephalopods from Morocco and their implications

Swiss Journal of Palaeontology
The present paper describes the latest cephalopod fauna from the Upper Ordovician in the Anti-Atlas region, Morocco. Two species are reported herein belonging to two genera including one new species, Tafadnatoceras elfechtense sp. nov.
Xiang Fang, Björn Kröger, Kun Liang, Qing Chen, Jiaqi Song, Lan Jiang, Yaoyan He, Chenggang Wang, Xiongwei Zeng, Hao Liu, Kai Wei, Fafu Wu, Wenkun Qie   +12 more
doaj   +1 more source

U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees)

Geologica Acta, 2011
New geochronological data from the Albera Massif confirm the presence of an Early – Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees.
M. LIESA TORRE-MARÍN, J. CARRERAS, P. CASTIÑEIRAS GARCÍA, J.M. CASAS, M. NAVIDAD, M. VILÀ   +5 more
doaj  

The appearance of Rosenella (stromatoporoid sponge) in Baltica: new species from the Pirgu Stage (Katian, Upper Ordovician) of Estonia [PDF]

Estonian Journal of Earth Sciences
The Katian Age, part of the Late Ordovician Epoch, was a period of significant stromatoporoid diversification. However, their fossil record is often less continuous, hindering our understanding of their diversity and diversification.
Juwan Jeon, Ursula Toom
doaj   +1 more source

Upper Ordovician exchinoderms from Buçaco, Portugal

, 2015
Peer ...
Montóia Jacinto, Ana Filipa, Gutiérrez-Marco, J. C., Zamora Iranzo, Samuel Andrés   +2 more
openaire   +1 more source

Conodont biostratigraphy in the Middle–Upper Ordovician boundary beds of Estonia [PDF]

Estonian Journal of Earth Sciences, 2008
Conodonts of the uppermost Uhaku, the Kukruse, and the lower Haljala stages (uppermost Darriwilian and lower Sandbian) of Estonia are discussed. The distribution of conodonts within the Pygodus serra, P.
Viira, Viive
doaj