Results 271 to 280 of about 64,380 (320)
Some of the next articles are maybe not open access.
1993
Abstract Most Ordovician and Silurian rocks in western and northwestern Canada were deposited on the North American craton and its western continental margin. Strata of these ages have also been recognized in three allochthonous terranes in the Cordillera, described in the companion volume on the Cordilleran Orogen (Gabrielse and Yorath,
M.P. Cecile, B.S. Norford
openaire +2 more sources
Abstract Most Ordovician and Silurian rocks in western and northwestern Canada were deposited on the North American craton and its western continental margin. Strata of these ages have also been recognized in three allochthonous terranes in the Cordillera, described in the companion volume on the Cordilleran Orogen (Gabrielse and Yorath,
M.P. Cecile, B.S. Norford
openaire +2 more sources
1996
In the history of Silurian biota and ecosystem as a whole no “big” catastrophes occurred like the one at the Ordovician-Silurian boundary. Yet it was not a quiet period either. There were established 15 more or less remarkable bio-events, among others the most severe extinction of conodonts and acritarchs in the very beginning of the Wenlock (Ireviken ...
Alain Le Hérissé +11 more
openaire +2 more sources
In the history of Silurian biota and ecosystem as a whole no “big” catastrophes occurred like the one at the Ordovician-Silurian boundary. Yet it was not a quiet period either. There were established 15 more or less remarkable bio-events, among others the most severe extinction of conodonts and acritarchs in the very beginning of the Wenlock (Ireviken ...
Alain Le Hérissé +11 more
openaire +2 more sources
‘The first true Silurian’ : an evaluation of the site of Murchison's discovery of the Silurian
Proceedings of the Geologists' Association, 1997In 1831 Sir Roderick Impey Murchison undertook an extensive geological fieldwork tour of England and Wales. He recounted retrospectively that one of the most momentous aspects of that tour was his encounter with greywacke rocks at a place called Cavansham Ferry in the valley of the River Wye in Wales. It was here that Murchison first decided that there
openaire +2 more sources
Journal of the Geological Society of Australia, 1966
Abstract During the Silurian Period, tectonism was fairly marked in the Chinese region, and extensive shallow‐water marine transgressions occurred, with the accompanying development of eugeosynclinal and miogeosynclinal regimes. In the Late Silurian, a Caledonian (Kwangsian) orogenic movement affected several regions of China and regression was marked.
openaire +2 more sources
Abstract During the Silurian Period, tectonism was fairly marked in the Chinese region, and extensive shallow‐water marine transgressions occurred, with the accompanying development of eugeosynclinal and miogeosynclinal regimes. In the Late Silurian, a Caledonian (Kwangsian) orogenic movement affected several regions of China and regression was marked.
openaire +2 more sources
1967
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire +1 more source
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire +1 more source
Transactions of the Edinburgh Geological Society, 1955
The occurrences of Silurian scorpions, eurypterids, and xiphosurans in Scotland are summarised. Slimonia acuminata var. nov. hendersoni and Stylonurus knoxae sp. nov. are described. New morphological information is given concerning Hughmilleria conica
openaire +2 more sources
The occurrences of Silurian scorpions, eurypterids, and xiphosurans in Scotland are summarised. Slimonia acuminata var. nov. hendersoni and Stylonurus knoxae sp. nov. are described. New morphological information is given concerning Hughmilleria conica
openaire +2 more sources
Silurian integrative stratigraphy and timescale of China
Science China. Earth Sciences, 2018Jiayu Rong +10 more
semanticscholar +1 more source
Spiny chondrichthyan from the lower Silurian of South China
Nature, 2022Plamen S Andreev, Ivan J Sansom, Min Zhu
exaly
Geological Society of America Bulletin, 1926
Introduction The writer agrees with Schuchert in referring to the Silurian system only the strata that occur between the top of the Richmond group of the Ordovician and the base of the Manlius formation of the Devonian. A marked sedimentary break is present at the top of the Richmond everywhere in Illinois, and with the exception of the long-lived ...
openaire +2 more sources
Introduction The writer agrees with Schuchert in referring to the Silurian system only the strata that occur between the top of the Richmond group of the Ordovician and the base of the Manlius formation of the Devonian. A marked sedimentary break is present at the top of the Richmond everywhere in Illinois, and with the exception of the long-lived ...
openaire +2 more sources