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.
Samuel E. Harris +20 more
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Ordovician and Silurian Formations of the Baltic Syneclise (NE Poland): An Organic Geochemistry Approach [PDF]
Lithosphere, 2022 The Baltic Syneclise is one of the Paleozoic basins along the western margin of the East European Craton. Commercial amounts of hydrocarbons have been found onshore and offshore in the Middle Cambrian sandstones and Upper Ordovician limestone reefs.
P. Kosakowski +2 more
doaj +2 more sources
The only known cyclopygid–‘atheloptic’ trilobite fauna from North America: the upper Ordovician fauna of the Pyle Mountain Argillite and its palaeoenvironmental significance [PDF]
, 2012 The trilobite fauna of the upper Ordovician (middle Katian) Pyle Mountain Argillite comprises a mixture of abundant mesopelagic cyclopygids and other pelagic taxa and a benthic fauna dominated by trilobites lacking eyes.
Bruton, D.L. +3 more
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Subway into the Ordovician (Prague Basin, Czech Republic) [PDF]
Estonian Journal of Earth Sciences, 2023 In the Late Ordovician, the Prague Basin was located at the high-latitude northwestern shelf of Gondwana. This period was characterised by profound environmental changes and ended by one of the most severe mass extinctions, which was caused by climatic ...
Jana Bruthansová +2 more
doaj +1 more source
Upper Cambrian-Ordovician reservoir characteristics in Well Gucheng-4 area, Tarim Basin
Petroleum Exploration and Development, 2008 : Based on the data of regional geologic background, core, and thin section, this paper studies the characteristics of sedimentary facies and reservoirs of the Upper Cambrian-Ordovician in Well Gucheng-4, Tarim Basin, and points out the potential and ...
Chang-jian ZHU +6 more
doaj +1 more source
Warm-water Dasycladaceae algae from the Late Ordovician of the Parahio Valley, Spiti, India [PDF]
Estonian Journal of Earth Sciences, 2019 Warm-water Dasycladaceae algae Mastopora and Cyclocrinites were for the first time recorded from the Takche Formation (Upper Ordovician–lower Silurian), Parahio Valley, Spiti, India.
Ravi S. Chaubey +5 more
doaj +1 more source
Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin [PDF]
Estonian Journal of Earth Sciences, 2010 Baltoscandian Middle and Upper Ordovician carbonate rocks are relatively poor in phosphorus, with the P2O5 content of 0.05–0.5%, rarely exceeding 1%. Phosphorus distribution in the Ordovician carbonate succession shows spatial and temporal variations. In
Leho Ainsaar +3 more
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Geofluids, 2019 The upper Ordovician-lower Silurian shale has always been the main target of marine shale gas exploration in southern China. However, the shale gas content varies greatly across different regions.
Ming Wen +14 more
doaj +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
THE AMERICAN UPPER ORDOVICIAN STANDARD [PDF]
Geological Society of America Bulletin, 1961 The large number of classifications of the type Cincinnatian (Ordovician) are to a great extent variations of a few fundamental concepts. Each of these elements is at least 40 years old and founded in the more rigid stratigraphic faiths of those times.
openaire +1 more source