Results 21 to 30 of about 684 (155)

Multiscale approach reveals that Cloudina aggregates are detritus and not in situ reef constructions. [PDF]

Proc Natl Acad Sci U S A, 2018
Significance Little is known about how the Ediacaran index fossil Cloudina lived and what impact it had on its surroundings. This uncertainty is due to the fact that Cloudina often is preserved with the same mineralogy as the rocks in which it is found; the lack of density contrast ...
Mehra A, Maloof A.
europepmc   +4 more sources

Doushantuo-Pertatataka—Like Acritarchs From the Late Ediacaran Bocaina Formation (Corumbá Group, Brazil)

Frontiers in Earth Science, 2021
Acritarchs, a polyphyletic group of acid-resistant organic-walled microfossils, dominate the eukaryotic microfossil record in the Proterozoic (2500–541 Ma) yet exhibit significant reduction in diversity and size at the transition to the Phanerozoic (541 ...
L. Morais, L. Morais, T. R. Fairchild, B. T. Freitas, I. D. Rudnitzki, E. P. Silva, D. Lahr, A. C. Moreira, E. A. Abrahão Filho, J. M. Leme, R. I. F. Trindade   +10 more
doaj   +1 more source

Three‐dimensional reconstruction, taphonomic and petrological data suggest that the oldest record of bioturbation is a body fossil coquina

Papers in Palaeontology, Volume 9, Issue 6, November/December 2023., 2023
Abstract Fossil material assigned to Nenoxites from the late Ediacaran Khatyspyt Formation of Arctic Siberia (550–544 Ma) has been presented as evidence for bioturbation prior to the basal Cambrian boundary. However, that ichnological interpretation has been challenged, and descriptions of similar material from other global localities support a body ...
Christos Psarras, Philip C.J. Donoghue, Russell J. Garwood, Dmitriy V. Grazhdankin, Luke A. Parry, Vladimir I. Rogov, Alexander G. Liu   +6 more
wiley   +1 more source

Unmixing of Magnetic Hysteresis Loops Through a Modified Gamma‐Cauchy Exponential Model

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 8, August 2023., 2023
Abstract Quantifying the contributions of distinct mineral populations in bulk magnetic experiments greatly enhances the analysis of environmental and rock magnetism studies. Here, we develop a new method of parametric unmixing of susceptibility components in hysteresis loops.
U. D. Bellon, R. I. F. Trindade, W. Williams   +2 more
wiley   +1 more source

New and revised small shelly fossil record from the lower Cambrian of northern Iran

Papers in Palaeontology, Volume 7, Issue 4, Page 2141-2181, November 2021., 2021
Abstract Small shelly fossils (SSFs) are highly informative of the ‘Cambrian explosion’. Their palaeobiodiversity has been documented from lower Cambrian deposits worldwide but it remains elusive in areas such as Iran, despite this region occupying a critical position on the north‐western Gondwana margin during the early Cambrian. This new study of the
Léa Devaere, Dieter Korn, Abbas Ghaderi, Ulrich Struck, Alireza K. Bavandpur, Javier Álvaro   +5 more
wiley   +1 more source

Ediacaran metazoan fossil record from South America and its implications in the studies about origin and complexification of animal life [PDF]

Geologia USP. Série Científica, 2013
The Ediacaran Period marks the first appearance of complex macroscopic organisms in the fossil record. Current evidence indicates that Ediacara biota is composed of animals, groups of extinct giant protists, algae and other organisms without proven ...
Bruno Becker Kerber, Ana Lucia Zucatti da Rosa, Sandra Garcia Gabas, Juliana de Moraes Leme, Mírian Liza Alves Forancelli Pacheco   +4 more
doaj   +1 more source

a new Pc-C boundary section [PDF]

, 2016
The widespread, terminal Ediacaran Dengying Formation (~ 551–~ 542 Ma) of South China hosts one of the most prominent negative carbonate carbon isotope excursions in Earth's history and thus bears on the correlation of the Precambrian–Cambrian boundary ...
Gamper, A., Heubeck, C., Hohl, S., Ohnemueller, F., Struck, U.   +4 more
core   +1 more source

New Facies Model and Carbon Isotope Stratigraphy for an Ediacaran Carbonate Platform From South America (Tamengo Formation—Corumbá Group, SW Brazil)

Frontiers in Earth Science, 2022
The Ediacaran is a period characterized by the diversification of early animals and extensive neritic carbonate deposits. These deposits are still not well understood in terms of facies and carbon isotope composition (δ13C). In this study we focus on the
Maria E. A. F. Ramos, Martino Giorgioni, Detlef H. G. Walde, Dermeval A. do Carmo, Gabriella Fazio, Lucieth C. Vieira, Matheus Denezine, Roberto V. Santos, Rodrigo R. Adôrno, Rodrigo R. Adôrno, Lucas Lage Guida   +10 more
doaj   +1 more source

The ‘biomineralization toolkit’ and the origin of animal skeletons

Biological Reviews, Volume 95, Issue 5, Page 1372-1392, October 2020., 2020
ABSTRACT Biomineralized skeletons are widespread in animals, and their origins can be traced to the latest Ediacaran or early Cambrian fossil record, in virtually all animal groups. The origin of animal skeletons is inextricably linked with the diversification of animal body plans and the dramatic changes in ecology and geosphere–biosphere interactions
Duncan J. E. Murdock
wiley   +1 more source

Avances recientes en la comprensión del sistema de vida terrestre del Ediacárico tardío en China meridional y el Ártico siberiano

Estudios Geologicos, 2019
El Ediacárico terminal inlcuye una serie de cambios drásticos en los ciclos biogeoquímicos, muchos de los cuales se asocian con modificaciones evolutivas en los registros fósiles correspondientes.
H. Cui, A. J. Kaufman, S. Xiao, D. V. Grazhdankin, S. Peek, A. J. Martin, N. V. Bykova, V. I. Rogov, X. M. Liu, F. Zhang, S. J. Romaniello, A. D. Anbar, Y. Peng, Y. Cai, J. D. Schiffbauer, M. Meyer, G. J. Gilleaudeau, R. E. Plummer, N. E. Sievers, S. Goderis, P. Claeys   +20 more
doaj   +1 more source