Results 71 to 80 of about 16,764 (247)

Ediacaran survivors [PDF]

The Paleontological Society Special Publications, 1992
Ediacaran taxa are a characteristic element of latest Precambrian biotas, with an effectively global distribution. Their time range is not well understood, but with one possible exception from western Canada Ediacaran faunas appear always to post-date the late Precambrian glaciations.
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Ediacaran oxidation and biotic evolution [PDF]

Nature, 2007
The link between the radiation of various lineages of eukaryotes in the latest Proterozoic and massive environmental changes--oxygenation, global ice ages and bolide impact--is the focus of much research interest. Fike et al. use carbon and sulphur isotope-chemostratigraphic data from Oman to propose three stages of oxidation in the Ediacaran oceans ...
Kathleen, Grey, Clive R, Calver
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Hydrocarbon expulsion model and resource potential evaluation of high-maturity marine source rocks in deep basins: Example from the Ediacaran microbial dolomite in the Sichuan Basin, China

Petroleum Science, 2022
Hydrocarbon expulsion features and resource potential evaluation of source rocks are crucial for the petroleum exploration. High-maturity marine source rocks have not exhibited a hydrocarbon expulsion mode owing to the lack of low-maturity source rocks ...
Wenyang Wang, X. Pang, Yaping Wang, Zhangxin Chen, Changrong Li, Xinhua Ma   +5 more
semanticscholar   +1 more source

Near-collapse of the geomagnetic field may have contributed to atmospheric oxygenation and animal radiation in the Ediacaran Period

Communications Earth & Environment
Earth’s magnetic field was in a highly unusual state when macroscopic animals of the Ediacara Fauna diversified and thrived. Any connection between these events is tantalizing but unclear. Here, we present single crystal paleointensity data from 2054 and
Wentao Huang, J. Tarduno, Tinghong Zhou, M. Ibáñez-Mejia, Laércio Dal Olmo‐Barbosa, Edinei Koester, E. Blackman, Aleksey V. Smirnov, Gabriel Ahrendt, R. Cottrell, Kenneth P. Kodama, R. Bono, D. Sibeck, Yong‐Xiang Li, F. Nimmo, Shuhai Xiao, M. Watkeys   +16 more
semanticscholar   +1 more source

A Chronostratigraphic Framework for the Rise of the Ediacaran Macrobiota: New Constraints from Mistaken Point Ecological Reserve, Newfoundland

GSA Bulletin, 2020
The Conception and St. John’s Groups of southeastern Newfoundland contain some of the oldest known fossils of the Ediacaran macrobiota. The Mistaken Point Ecological Reserve UNESCO World Heritage Site is an internationally recognized locality for such ...
J. Matthews, A. Liu, Chuan Yang, D. McIlroy, B. Levell, D. Condon   +5 more
semanticscholar   +1 more source

The Ediacaran−Cambrian transition in the southern Great Basin, United States

GSA Bulletin, 2022
The Ediacaran−Cambrian boundary strata in the Great Basin of the southwestern United States record biological, geochemical, and tectonic change during the transformative interval of Earth history in which metazoans diversified. Here, we integrate new and
E. F. Smith, L. Nelson, Nizhoni O’Connell, A. Eyster, Mary C Lonsdale   +4 more
semanticscholar   +1 more source

Guts, gut contents, and feeding strategies of Ediacaran animals.

Current Biology, 2022
The oldest animals appear in the fossil record among Ediacara biota communities. They prelude animal-dominated ecosystems of the Phanerozoic and may hold clues to the appearance of modern animal phyla in the Cambrian explosion.
I. Bobrovskiy, A. Nagovitsyn, J. Hope, Ekaterina Luzhnaya, J. Brocks   +4 more
semanticscholar   +1 more source

Early Cambrian U-Pb zircon age and Hf-isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc [PDF]

, 2016
An Early Cambrian pluton, known as the Guasayán pluton, has been identified in the central area of Sierra de Guasayán, northwestern Argentina. A U?Pb zircon Concordia age of 533 ± 4 Ma was obtained by LA-MC-ICP-MS and represents the first report of ...
Alasino, Pablo Horacio, Baldo, Edgardo Gaspar Agustín, Basei, Miguel A. S., da Costa Campos Neto, Mario, Dahlquist, Juan Andrés, Rapela, Carlos Washington, Uran, Gimena Mariel, Verdecchia, Sebastián Osvaldo, Zandomeni, Priscila Soledad   +8 more
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Ediacaran Araba Complex of Jordan [PDF]

GeoArabia, 2015
ABSTRACTThe Ediacaran Araba Complex in Jordan is defined and described for the first time in lexicon style, with an emphasis on the sedimentary, volcanic and volcaniclastic units outcropping adjacent to Wadi Araba, and from seismic and deep exploration well data. The Araba Complex ranges in age from ca.
Powell, John H., Abed, Abduklader, Jarrar, Ghaleb H.   +2 more
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Revisiting Ediacaran sulfur isotope chemostratigraphy with in situ nanoSIMS analysis of sedimentary pyrite

Geology, 2021
Reconstructions of ancient sulfur cycling and redox conditions commonly rely on sulfur isotope measurements of sedimentary rocks and minerals. Ediacaran strata (635–541 Ma) record a large range of values in bulk sulfur isotope difference (Δ34S) between ...
Wei Wang, Yongliang Hu, A. Muscente, Huan Cui, C. Guan, J. Hao, Chuanming Zhou   +6 more
semanticscholar   +1 more source