Results 111 to 120 of about 6,764 (250)

Acritarchs from the Abbaye de Villers and Tribotte Formations in their type section of the Thyle river valley (Middle Ordovician, Brabant Massif, Belgium) and their stratigraphic implications [PDF]

open access: yes, 2011
Reinvestigation of the Thyle river section, in the southern part of the Brabant Massif, has led to a better understanding of acritarch distribution in the Middle Ordovician Abbaye de Villers and Tribotte formations, and their stratigraphical significance
Vanguestaine, M., Wauthoz, B.
core  

Research progress and challenges in thermal maturity evalution of Lower Paleozoic source rocks

open access: yesShiyou shiyan dizhi
Marine source rocks in China's Lower Paleozoic are predominantly in the highly to over-mature stage. The lack of vitrinite in these strata has made thermal maturity evaluation a persistent technical challenge in deep hydrocarbon exploration.
Xiaowei ZHENG   +3 more
doaj   +1 more source

Siluro-Devonian graptolite stratigraphy of the Catalonian Coastal Ranges [PDF]

open access: yes, 1985
Two facies characterize the Silurian and lower Devonian of the Catalonian Coastal Ranges, namely euxinic and pelagic carbonate facies. The first, is represented by black shales in which the atavus, acinaces, cyphus, triangulatus, convolutus, ?sedgwickii,
Chapman, A. J.   +3 more
core   +1 more source

Silurian (Llandovery) monograptids from the Vargas Peña Formation (Paraná Basin, Eastern Paraguay)

open access: yesGeologica Acta, 2009
The Itacurubí Group is a siliciclastic Silurian sequence exposed in eastern Paraguay (Paraná Basin). It includes from bottom to top the Eusebio Ayala, Vargas Peña and Cariy formations.
N.J. URIZ   +2 more
doaj  

Rapid marine oxygen variability: Driver of the Late Ordovician mass extinction. [PDF]

open access: yesSci Adv, 2022
Kozik NP   +8 more
europepmc   +1 more source

The Silurian of Sardinia [PDF]

open access: yes, 2009
The present volume “The Silurian of Sardinia” is composed of two related components. The first part comprises seven contributions introduced by an historical overview on the studies already carried out on the Silurian faunas of Sardinia.
C. CORRADINI, A. FERRETTI, P. STORCH   +3 more
core  

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