Results 21 to 30 of about 1,497,171 (212)
An Ordovician ostracod palaeopsychrosphere? [PDF]
Estonian Journal of Earth Sciences, 2023 Ostracods are tiny bivalved crustaceans with a fossil record extending into rocks of the Lower Ordovician. They occupy almost all aquatic environments today, from the ocean abyssal planes to damp forest leaf litter.
Anna McGairy +6 more
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A geomagnetic polarity stratigraphy for the Middle and Upper Ordovician [PDF]
Palaeogeography, Palaeoclimatology, Palaeoecology, 2021 Magnetostratigraphic studies of the Ordovician provide evidence for the nature of core-mantle boundary interactions, and provide means for dating and correlation across differing environmental regimes. We provide new magnetostratigraphic data from the Middle and Upper Ordovician, compiling this into a polarity chronostratigraphic scale for the ...
Hounslow, Mark +6 more
openaire +3 more sources
Silurian graptolite biostratigraphy of the Röstånga-1 drill core, Scania:a standard for southern Scandinavia [PDF]
, 2014 The Rostanga-1 core from west-central Scania provides the most complete succession of the Sandbian (Upper Ordovician) through lower Telychian (Silurian, Llandovery) strata of southern Scandinavia. The Hirnantian is identified in the Kallholn Formation by
Ahlberg, Per +5 more
core +1 more source
Natural gas accumulation and models in Ordovician carbonates, Ordos Basin, NW China
Petroleum Exploration and Development, 2014 According to sedimentary environment, sources, hydrocarbon accumulation characteristics and gas reservoir types of the Ordovician in the Ordos Basin, the Ordovician carbonate rocks in the basin have good gas accumulation conditions.
Yanru GUO +9 more
doaj +1 more source
Global palaeogeographical implication of acritarchs in the Upper Ordovician
Estonian Journal of Earth Sciences, 2023 The EarlyâMiddle Ordovician peri-Gondwana and Baltica acritarch provinces are easily recognizable, illustrating a clear provincialism of global phytoplankton. However, acritarch assemblages have been reported to become increasingly similar towards the Late Ordovician, revealing a general cosmopolitanism, although, based on more recent studies ...
Yan Kui +4 more
openaire +2 more sources
Petroleum Exploration and Development, 2012 A process for identifying marine hydrocarbon source rocks is established based on outcrop measurement, ground-penetrating radar survey, core analysis, logging evaluation, seismic interpretation, etc.
Shuichang ZHANG +5 more
doaj +1 more source
Natural Gas Industry B, 2016 During the progressive exploration of the Jingbian Gas Field in the Ordos Basin, multiple gas-bearing regions have been discovered in the dolomite reservoirs in the Middle Ordovician assemblages of Lower Paleozoic in Jingxi area, but these gas-bearing ...
Xinshe Liu +6 more
doaj +1 more source
The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin)
Comptes Rendus. Géoscience, 2023 In the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of the most proximal succession of the north-facing Gondwana platform. This study presents preliminary results related to the c.
Ghienne, Jean-François +4 more
doaj +1 more source
Petroleum Exploration and Development, 2019 Based on field outcrop investigation, interpretation and analysis of drilling and seismic data, and consulting on a large number of previous research results, the characteristics of ancient marine hydrocarbon source rocks, favorable reservoir facies ...
Jinhu DU +8 more
doaj +1 more source
Cornulitids from the Upper Ordovician of northwestern Russia [PDF]
Carnets de géologie (Notebooks on geology), 2017 Four cornulitid species occur in the Rakvere Regional Stage in NW Russia. The new species Conchicolites rossicus is here described; it is the earliest known Conchicolites from the Ordovician of Baltica. The new species has very small tubes with sharp, strong and regular annulations.
Olev Vinn, Anna Madison
openaire +1 more source