Results 41 to 50 of about 169 (141)

The lower boundary of the Haljala Regional Stage (Sandbian, Upper Ordovician) in Estonia [PDF]

Estonian Journal of Earth Sciences, 2020
Multi-proxy correlation is used to address the boundary of the Kukruse and Haljala regional stages across the Estonian part of the Baltoscandian Ordovician Palaeobasin.
Tõnn Paiste, Peep Männik, Jaak Nõlvak, Tõnu Meidla   +3 more
doaj   +1 more source

Lower Silurian biostratigraphy of the Viirelaid core, western Estonia [PDF]

Estonian Journal of Earth Sciences, 2007
The distribution of five groups of fossils in the upper Llandovery (Telychian) and Wenlock of the Viirelaid core section, Estonia, is presented and discussed in terms of their biozones (conodonts and chitinozoans) and mutual positions (scolecodonts ...
Nestor, Viiu, Meidla, Tõnu, Männik, Peep, Hints, Olle, Rubel, Madis, Sarv, Lembit, Sibul, Ivo   +6 more
doaj  

Palynostratigraphy and palaeoecology of the Niur Formation, Tikdar section, northwest of Kerman, Central Iran [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2019
Diverse, moderately to well-preserved palynomorphs including acritarchs (sensu stricto), prasinophytes cyst, chitinozoans, scolecodonts, and spores occur in some surface samples (90 meters thereof) of the Niur Formation (200 m thick) at the Tikdar ...
Hossein Hashemi, fereshteh sajjadi, Neda Bahrami Hesari   +2 more
doaj   +1 more source

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source

A new euarthropod from the Soom Shale (Ordovician) Konservat‐Lagerstätte, South Africa, with exceptional preservation of the connective endoskeleton and myoanatomy

Papers in Palaeontology, Volume 11, Issue 2, March/April 2025.
Abstract A new exceptionally preserved euarthropod, Keurbos susanae gen. et sp. nov. from the Upper Ordovician Soom Shale Konservat‐Lagerstätte of South Africa, is described herein. Two specimens exhibit an unusual preservation style such that the cuticular exoskeleton is preserved in low relief but retains high‐fidelity details, whereas the internal ...
Sarah E. Gabbott, Gregory D. Edgecombe, Johannes N. Theron, Richard J. Aldridge   +3 more
wiley   +1 more source

Biostratigraphy of the Ludlow chitinozoans from East Baltic drill cores [PDF]

Estonian Journal of Earth Sciences, 2009
The distribution of chitinozoans in the East Baltic Ludlow sequences was studied in the Ohesaare, Ventspils, Pavilosta, and Dubovskoye drill core sections.
Nestor, Viiu
doaj  

Precise chitinozoan dating of Ordovician impact events in Baltoscandia [PDF]

Journal of Micropalaeontology, 1996
Abstract. The chitinozoan biostratigraphy of four Ordovician impact craters has been investigated. Three of these (Tvären, Kärdla and Lockne) contain complete sequences of early Caradoc age, while the Granby crater contains rocks of late Arenig age yielding two bentonitic horizons at their top. Chitinozoans, together with graptolites and other planktic
Grahn, Yngve, Nõlvak, Jaak, Paris, Florentin   +2 more
openaire   +2 more sources

Hirnantian (latest Ordovician) bio- and chemostratigraphy of the Stirnas-18 core, western Latvia [PDF]

Estonian Journal of Earth Sciences, 2010
Integrated study of the uppermost Ordovician Porkuni Stage in the Stirnas-18 core, western Latvia, has revealed one of the most complete Hirnantian successions in the eastern Baltic region.
Hints, Linda, Hints, Olle, Kaljo, Dimitri, Kiipli, Tarmo, Männik, Peep, Nõlvak, Jaak, Pärnaste, Helje   +6 more
doaj  

The Llandovery (Silurian) conodont species diversity on the Upper Yangtze Platform, South China [PDF]

Estonian Journal of Earth Sciences, 2014
Conodonts are one of the stratigraphically most important fossil groups in the Silurian Period. We examine the regional diversity dynamics of the Llandovery condonts on the Upper Yangtze Platform.
Zhongyang Chen, Junxuan Fan, Xudong Hou, Linli Lu   +3 more
doaj   +1 more source