Results 91 to 100 of about 3,951 (214)

BOUNDARY BETWEEN THE TIMANIAN AND URALIAN TECTONIC CYCLES: RESULTS OF DATING OF DETRITAL ZIRCONS FROM BASAL HORIZONS OF THE LOWER PALEOZOIC SYNRIFT COMPLEX OF THE POLAR URALS, AND IGNEOUS ROCK AGE DATA REPORT

open access: yesГеодинамика и тектонофизика
The Upper Cambrian-Lower Ordovician terrigenous strata, unconformably overlying the Upper Riphean-Vendian rocks of the Timanide orogen in the north of the Urals, and contemporaneous bimodal volcanics and intrusive rocks are considered complexes marking ...
A. A. Soboleva   +2 more
doaj   +1 more source

Chemical peculiarities of the Silurian–Ordovician and Cambrian–Vendian aquifer systems in Estonia: an overview of hydrochemical studies [PDF]

open access: yesEstonian Journal of Earth Sciences, 2009
The chemical composition of groundwater was studied and plausible reasons for its peculiarities were evaluated on the basis of long-term groundwater monitoring data.
Karro, Enn   +3 more
doaj  

Integrated chemo- and biostratigraphic calibration of early animal evolution: Neoproterozoic-early Cambrian of southwest Mongolia [PDF]

open access: yes, 2017
Five overlapping sections from the thick Neoproterozoic to early Cambrian sediments of western Mongolia were analysed to yield a remarkable carbon-isotope, strontium-isotope and small shellyfossil (SSF) record.
Brasier, M. D.   +3 more
core  

Hydrothermalismes anté-Hercynien en Sud-Ibérie : apport de la géochimie isotopique du plomb.

open access: yes, 2002
International audienceLead isotope study has been performed on massive sulphide deposits of Ossa-Morena and Aracena Belt (South Iberia). Results suggest the existence of at least two ancient hydrothermal events.
Marcoux, Eric   +2 more
core   +5 more sources

Biodiversity of the Ediacaran-early Cambrian transition in northwestern Argentina and related areas [PDF]

open access: yes, 2012
The Ediacaran-early Cambrian is a significant time of geological history in terms of biodiversity dynamics. During this time-span a particular soft-bodied fauna developed and disappeared, being replaced by the emergent skeleton-bearing faunas.
Aceñolaza, Florencio Gilberto
core  

Sales of antibiotics without a prescription in pharmacies, 2017 and 2021, China. [PDF]

open access: yesBull World Health Organ, 2023
Chen J   +7 more
europepmc   +1 more source

FORMAŢIUNEA VENDIANULUI DIN REGIUNEA CENTRALĂ A BAZINULUI r. NISTRU

open access: yesStudia Universitatis Moldaviae: Stiinte reale si ale naturii, 2009
The present article is dedicated to the Moldovan geologist Petru Bucatciuc, who during a couple of years was seriously engaged in studying the stratigraphic differentiation of the terigen formations of the Vendian age that are placed in the North region
USM ADMIN
doaj  

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