Results 21 to 30 of about 848 (154)

Ultrastructure of Ediacaran cloudinids suggests diverse taphonomic histories and affinities with non-biomineralized annelids. [PDF]

Sci Rep, 2020
Cloudinids have long been considered the earliest biomineralizing metazoans, but their affinities have remained contentious and undetermined. Based on well-preserved ultrastructures of two taxa, we here propose new interpretations regarding both their ...
Yang B, Steiner M, Schiffbauer JD, Selly T, Wu X, Zhang C, Liu P.   +6 more
europepmc   +3 more sources

Controls on the evolution of Ediacaran metazoan ecosystems: A redox perspective. [PDF]

Geobiology, 2017
A growing number of detailed geochemical studies of Ediacaran (635–541 Ma) marine successions have provided snapshots into the redox environments that played host to the earliest known metazoans.
Bowyer F, Wood RA, Poulton SW.
europepmc   +5 more sources

Flexible and responsive growth strategy of the Ediacaran skeletal Cloudina from the Nama Group, Namibia [PDF]

Geology, 2017
Abstract The Ediacaran skeletal tubular putative metazoan Cloudina occurs globally in carbonate settings, which both provided lithified substrates and minimized the cost of skeletonization. Habitat and substrate preferences and the relationship of Cloudina to other metazoans have not been fully documented, so we know little as to its ...
R. Wood, A. Curtis, A. Penny, A. Zhuravlev, S. Curtis-Walcott, Secilie Iipinge, F. Bowyer   +6 more
semanticscholar   +3 more sources

Paleobiologia de Cloudina sp. (Ediacarano, Grupo Corumbá): implicações tafonômicas, taxonômicas e paleoecológicas [PDF]

, 2015
B. Kerber
semanticscholar   +2 more sources

Localized and Transient Oxygenation of Shallow Oceans of Southwestern Laurentia at the Ediacaran-Cambrian Boundary. [PDF]

Geobiology
ABSTRACT The Ediacaran–Cambrian boundary, which precedes one of the most significant biotic diversification events in Earth's history, is associated with a global negative carbon isotope excursion termed the BAsal Cambrian carbon isotope Excursion (BACE).
Chanchai W, Nelson LL, Smith EF, Hardisty DS, Lonsdale MC, Burke JE, Lau KV.   +6 more
europepmc   +2 more sources

Life history and autecology of an Ediacaran index fossil: Development and dispersal of Cloudina [PDF]

Gondwana Research, 2015
Abstract Cloudina is the best-known biomineralizing metazoan and a potential index fossil in the late Ediacaran Period, yet many aspects of its biology remain poorly understood. Previous reports have shown that Cloudina tubes grow from a basally closed funnel (or apical element), with occasional dichotomous branching.
I. Cortijo, Yaoping Cai, H. Hua, J. Schiffbauer, S. Xiao   +4 more
semanticscholar   +2 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