Results 121 to 130 of about 16,764 (247)

Oxidation of the Ediacaran Ocean

Nature, 2006
Oxygenation of the Earth's surface is increasingly thought to have occurred in two steps. The first step, which occurred approximately 2,300 million years (Myr) ago, involved a significant increase in atmospheric oxygen concentrations and oxygenation of the surface ocean.
Fike, D. A., Grotzinger, J. P., Pratt, L. M., Summons, R. E.   +3 more
openaire   +3 more sources

U-Pb geochronology of the El Jadida rhyolite and relation to possible Lower Cambrian recycling (Coastal block, Moroccan Meseta). [PDF]

, 2018
The El Jadida (Mazagan) dome, whose existence was reported as early as 1934 by Yovanovitch and Freys, constitutes one of the first outcrops of the Moroccan Meseta where the Precambrian (PIII?)-Paleozoic (Lower Cambrian?) boundary was established (Gigout,
El Attari, A., El Houicha, M., Ezzouhairi, H., Fekkak, A,, Gama, C., Jouhari, A., Nasser, N., Pereira, M.F., Silva, J.B.   +8 more
core  

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy [PDF]

, 2016
Esta revisão incorpora novos dados isotópicos e químicos para correlação quimioestratigráfica de sucessões, predominantemente carbonáticas, na América do Sul (Argentina, Bolívia, Brasil, Paraguai e Uruguai).
Alvarenga, Carlos José Souza de, Boggiani, Paulo Cesar, Cezario, Wilker dos Santos, Chiglino, Leticia, Fernández Ramírez, Rodrigo, Ferreira, Valderez Pinto, Gaucher, Claudio, Geraldes, Mauro, Misi, Aroldo, Pedreira, José Augusto, Pereira, Natan Silva, Pimentel, Marcio Martins, Sial, Alcides Nobrega, Warren, Lucas Verissimo   +13 more
core   +2 more sources

Exploring the roles of conserved context‐dependent cis‐regulatory elements (cdCREs) in multicellularity, human health and disease

The FEBS Journal, Volume 292, Issue 23, Page 6163-6181, December 2025.
Conserved context‐dependent cis‐regulatory elements act as a major reservoir of disease‐associated polymorphisms in the human genome and are also affected by epigenetic change. This ‘state‐of‐the‐art’ review explores the latest developments in studying these enigmatic elements and how the effects of disease‐associated polymorphisms and environmentally ...
Andrew McEwan, Alexander Rattray, Greg Hutchings, Elizabeth Hay, Chris Murgatroyd, Alasdair MacKenzie   +5 more
wiley   +1 more source

Guide to the geology of Bradgate Park and Swithland Wood, Charnwood Forest [PDF]

, 2010
Charnwood Forest is one of the few parts of England where there are exposures of ‘basement’ rocks dating back to Precambrian time. Its locally rugged topography is caused by these highly resistant rocks protruding as craggy knolls through a surrounding ...
Carney, J.N.
core  

U-Pb geochronology and global context of the Charnian Supergroup, UK: constraints on the age of key Ediacaran fossil assemblages [PDF]

, 2014
U-Pb (zircon) ages for key stratigraphic volcanic horizons within the ∼3200-m-thick Ediacaran-age Charnian Supergroup provide an improved age model for the included Avalonian assemblage macrofossils and, hence, temporal constraints essential for ...
Carney, John N., Condon, Daniel J., Ford, Trevor D., Noble, Stephen R., Pharaoh, Timothy C., Wilby, Philip R.   +5 more
core   +1 more source

Separate Determination of Strontium and Barium Mass Fractions in Calcite and Dolomite in Carbonate Rocks by a Multi‐step Sequential Leaching Procedure

Geostandards and Geoanalytical Research, Volume 49, Issue 4, Page 751-769, December 2025.
Key Points A ten‐step sequential leaching procedure was applied to dissolve carbonate samples, with 10% of the sample mass dissolved in each step. Calcite dissolves preferentially compared with dolomite. Strontium and barium concentrations released in each step are proportional to the dissolved calcite‐to‐dolomite ratio.
Kaiyu Wu, Yuichiro Ueno, Jakub Surma, Chiyori Nakajo   +3 more
wiley   +1 more source

Discovery of the oldest bilaterian from the Ediacaran of South Australia

Proceedings of the National Academy of Sciences of the United States of America, 2020
Significance The transition from simple, microscopic forms to the abundance of complex animal life that exists today is recorded within soft-bodied fossils of the Ediacara Biota (571 to 539 Ma).
S. Evans, I. Hughes, J. Gehling, M. Droser   +3 more
semanticscholar   +1 more source

Power, competition, and the nature of history [PDF]

, 2019
Historians have debated whether pathways and events from the past to the present are influenced largely by contingency, the dependence of outcomes on particular prior conditions, or whether there is long-term emergent directional change.
Vermeij, Geerat J
core   +1 more source

Palaeoceanographic controls on spatial redox distribution over the Yangtze Platform during the Ediacaran–Cambrian transition [PDF]

, 2016
The Ediacaran–Cambrian interval was an eventful transitional period, when dynamic interactions between the biosphere and its physical environment allowed the Earth System to cross into a new state, characterized by the presence of metazoans, more equable
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core   +2 more sources