Results 21 to 30 of about 5,193 (249)
Ediacaran and Cambrian stratigraphy in Estonia: an updated review [PDF]
Estonian Journal of Earth Sciences, 2017 Previous late Precambrian and Cambrian correlation charts of Estonia, summarizing the regional stratigraphic nomenclature of the 20th century, date back to 1997.
Tõnu Meidla
doaj +1 more source
Frontiers in Earth Science, 2023 The Qaidam Precambrian block is located in the northeastern Tibetan Plateau and was intruded by numerous Ordovician-Devonian granitoids during and after the closure of the Proto-Tethys Ocean.
Xia Teng +7 more
doaj +1 more source
Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
Paleolatitude and cause of the Svecokarelian orogeny [PDF]
Bulletin of the Geological Society of Finland, 1974 Paleomagnetic data suggest a paleolatitude of 22°N for the Fennoscandian protocontinent during the Svecokarelian orogeny. This is lower than that of the Canadian shield during the same period.
K.J. Neuvonen
doaj +1 more source
Geosciences, 2021 The results from the geological and geophysical investigations of the Siljan Ring impact structure (central Sweden) have shown that the Paleozoic sedimentary succession and the Precambrian basement were strongly affected by complex deformational ...
Olga Sivalneva +7 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2022 The deep ocean is generally considered to have changed from anoxic in the Precambrian to oxygenated by the Late Paleozoic (∼420–400 Ma) due to changes in atmospheric oxygen concentrations.
Daniel A. Stolper +5 more
doaj +1 more source
Геофизический журнал, 2022 The name «Bug Series» was introduced into the Precambrian stratigraphic scheme of the Ukrainian Shield more than half a century ago. During this period, ideas about the composition and age of the series changed several times but, until recently, the ...
V.P. Kyrylyuk
doaj +1 more source
Article 2. Structural position of suites and strata of the “Bug series”
Геофизический журнал, 2023 The name “Bug Series” was introduced into the Precambrian stratigraphic scheme of the Ukrainian Shield more than half a century ago. During this period, ideas about the composition and age of the series changed several times, but at the same time, until
V.P. Kyrylyuk
doaj +1 more source
The Late Great Unconformity of the Central Canadian Shield
Geochemistry, Geophysics, Geosystems, 2021 The Great Unconformity is a widely distributed surface separating Precambrian rocks from overlying Phanerozoic sedimentary sequences. The causes and implications of this feature, and whether it represents a singular global event, are much debated.
C. P. Sturrock +2 more
doaj +1 more source
The Precambrian in the Sub-Polar Urals : the chronostratigraphic aspect.
Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2019 New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinoriumis the stratotype for the entire Timan-Northern Urals region.
Александр Михайлович Пыстин +3 more
doaj +1 more source