Results 21 to 30 of about 2,119,061 (274)

Association of uranium with macerals in marine black shales: Insights from the Upper Devonian New Albany Shale, Illinois Basin

International Journal of Coal Geology, 2020
Marine organic-rich shales generally have high uranium content associated with sedimentary organic matter. However, organic matter in black shales is not homogeneous, but instead a mixture of different macerals.
Bei Liu, M. Mastalerz, J. Schieber, J. Teng   +3 more
semanticscholar   +1 more source

Inverse correlation between the molybdenum and uranium isotope compositions of Upper Devonian black shales caused by changes in local depositional conditions rather than global ocean redox variations

Geochimica et Cosmochimica Acta, 2020
Coupled Mo-U isotope data from the Upper Devonian Kettle Point Formation (Ontario, Canada) provide a cautionary tale regarding interpretation of global ocean redox conditions using data from euxinic black shales.
B. Kendall, Jieying Wang, Wang Zheng, S. Romaniello, D. Jeffrey Over, Yvonne Bennett, Liyan Xing, A. Kunert, Cameron Boyes, Jian Liu   +9 more
semanticscholar   +1 more source

Lithological and biostratigraphic characteristics of the Upper Silurian and Lower Devonian deposits of the southwestern part of the field named after Roman Trebs

Georesursy, 2018
A conodont sequence from the Przhidolian stage of the Upper Silurian and almost the entire Lokhkovian stage of the Lower Devonian has been established in the sections of the Upper Silurian-Lower Devonian on the southwestern part of the field named after ...
Т.М. Mavrinskaya, E.N. Savelyeva, K.D. Shumatbaev   +2 more
doaj   +1 more source

The Spirifers of the Upper Devonian [PDF]

Science, 1884
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openaire   +2 more sources

The stratigraphie distribution of antiarch remains (Pisces, Placodermi) in Devonian of southern regions of Russia

Известия высших учебных заведений: Геология и разведка, 2015
The stratigraphic distribution of antiarch remains in the Middle-Upper Devonian of central, southern and east-south regions of East European Platform (EEP), western slope of South Urals and Siberia are analyzed.
S. V. Moloshnikov
doaj   +1 more source

Scientific and applied significance of late devonian paleontological thin sections collection (algoflora) stored in the Institute of Geological Sciences of the National Academy of Sciences of Ukraine

Мінеральні ресурси України, 2023
Information on the thin sections collection from Late Devonian deposits of Donets Basin, the Dnipro-Donets Depression, the Pre-Dobrudzhian and Lviv Paleozoic Toughs is provided.
O. A. Sukhov, A. D. Gusarova
doaj   +1 more source

A vertical water exchange of the groundwater in the central part of Moscow artesian basin

Известия высших учебных заведений: Геология и разведка, 2017
The hydrogeological features of the central part of the Moscow artesian basin (MAB) under the natural conditions provided the existence of the downward vertical flows of the groundwater, the formation of the fresh underground waters of the Carboniferous ...
N. V. Fisun
doaj   +1 more source

Devonian–Carboniferous extension and Eurekan inversion along an inherited WNW–ESE-striking fault system in Billefjorden, Svalbard [version 2; peer review: 2 approved, 1 not approved]

Open Research Europe, 2023
Background The Billefjorden area in central Spitsbergen hosts thick Lower–lowermost Upper Devonian, late–post-Caledonian collapse deposits presumably deformed during the Late Devonian Svalbardian Orogeny.
Lis Allaart, Jean-Baptiste P. Koehl, Riko Noormets   +2 more
doaj   +1 more source

SEUQENCE AND CORRELATION OF DEPOSITS OF IZHMA STEP UPPER DEVONIAN COMPLEX

Известия высших учебных заведений: Нефть и газ, 2015
It is shown that identification of regularities of hydrocarbon deposits occurrence in the Upper Devonian complex carbonate massifs in the Timan Pechora province is an actual problem.
L. V. Parmuzina, Yu. A. Lagutina, A. E. Smirnova   +2 more
doaj   +1 more source

The Upper Devonian delta of the Appalachian geosyncline [PDF]

American Journal of Science, 1914
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openaire   +1 more source