Results 1 to 10 of about 1,487,618 (230)

AGNI-DRILL - A COMPLEX DRILLING FLUID FOR DRILLING IN KYNOVSK MUDSTONES

open access: yesИзвестия высших учебных заведений: Нефть и газ, 2016
Oil pools developed by PJSC «Tatneft» are mainly confined to the Devonian deposits, the top of which is represented by Kynovsk argillites. The construction of a horizontal wellbore in the Upper Devonian terrigenous strata (D0) is complicated by the ...
L. B. Huzina, R. A. Usmanov, S. I. Golyb
doaj   +1 more source

Provenance reconstructions. Article 1. Mineralogical and petrographic approaches and methods

open access: yesЛитосфера, 2020
Research subject. This is the first in the series of four articles, which aims to review existing provenance reconstruction tools.Methods and materials.
A. V. Maslov   +3 more
doaj   +1 more source

Sarcopterygian and other Fishes from the Marine Upper Devonian of Colorado, U.S.A. [PDF]

open access: yesFossil Record, 1998
The fish fauna of Upper Devonian deposits of SW Colorado is described and compared with those of Central Colorado. The osteolepidid Litoptychus is redescribed including skull roof, cheek, palatoquadrate, cleithrum and postcranial elements.
H.-P. Schultze, J. Chorn
doaj   +3 more sources

Rediscovery of the Type Specimens of the Sarcopterygian Fishes Onychodus sigmoides and Onychodus hopkinsi from the Devonian of Ohio, USA

open access: yesDiversity
John Strong Newberry described three species of the lobe-fin fish Onychodus (Osteichthyes, Sarcopterygii, Onychodontida) based on parasymphysial teeth, or tusks.
Loren E. Babcock
doaj   +1 more source

Salt dissolution tectonism and origin of lacustrine carbonate beds: Mn‐Fe‐calcite and Mn‐siderite micro‐spherulite fabrics of the Lower Cretaceous McMurray Formation, Athabasca Oil Sands deposit, western Canada

open access: yesThe Depositional Record, 2022
Several lacustrine carbonate beds, each a metre‐thick interval of densely packed Mn‐rich sideritic micro‐spherulites or Mn‐rich ferroan calcite micro‐spherulites, are recorded for the first time within strata of the Lower Cretaceous McMurray Formation of
Paul L. Broughton
doaj   +1 more source

Upper Devonian Brachiopods from Eastern Taurus (Turkey)

open access: yesGeologia Croatica, 2006
During a field expedition in Taurus (SE Turkey) in order to studythe Lower Palaeozoic series, a small brachiopod fauna was collectedin the Kozan area in beds of supposed Silurian age.
Remy Gourvennec
doaj   +1 more source

Stratigraphic distribution and systematic composition of the Middle-Upper Devonian placoderms (anti-archs) from Central Kazakhstan

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2016
The stratigraphie distribution and systematic composition of the Middle-Upper Devonian remains of antiarchs from the sediments of Central Kazakhstan are analyzed. Central Kazakhstan ichthyofauna contains mainly endemic taxons of antiarchs.
S. V. Moloshnikov
doaj   +1 more source

New data on oil and gas potential of the Vychegda Trough

open access: yesGeoresursy, 2020
This article is devoted to the problem of studying the petroleum potential of the underexplored territories of the European part of Russia, in particular, the Vychegda trough.
Tatyana V. Karaseva   +3 more
doaj   +1 more source

Lower Devonian lithofacies and palaeoenvironments in the southwestern margin of the East European Platform (Ukraine, Moldova and Romania) [PDF]

open access: yesEstonian Journal of Earth Sciences, 2016
Lower Devonian palaeoshelf deposits extend along the western margin of the East European Platform from the Baltic Sea to the Black Sea. These deposits have been studied on the territory of Ukraine (Volyn-Podillyan Plate, Dobrogean Foredeep) and ...
Natalia Radkovets
doaj   +1 more source

Late Famennian correlation by miospores between the Refrath 1 borehole (Bergisch Gladbach-Paffrath Syncline, Germany) and the reference section of Chanxhe (Dinant Syncline, Belgium)

open access: yesCarnets de Géologie, 2005
The Bergisch Gladbach-Paffrath Syncline and the Dinant Syncline are both part of the Ardennes-Rhenish Massif but are separated by some 100 km. In the Upper Devonian succession of the Bergisch Gladbach-Paffrath Syncline (The Bergisches Land), the ...
Hartkopf-Fröder Christoph   +1 more
doaj  

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