Results 1 to 10 of about 684 (155)

Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina [PDF]

Scientific Reports, 2021
Cloudina is a globally distributed Ediacaran metazoan, with a tubular, funnel-in-funnel form built of thin laminae (ca. 1–10 μm). To what degree local environmental controlled morphology, and whether early diagenesis controlled the degree of ...
Rachel A Wood
exaly   +11 more sources

Ecological interactions in Cloudina from the Ediacaran of Brazil: implications for the rise of animal biomineralization [PDF]

Scientific Reports, 2017
At the Ediacaran/Cambrian boundary, ecosystems witnessed an unparalleled biological innovation: the appearance of shelled animals. Here, we report new paleoecological and paleobiological data on Cloudina, which was one of the most abundant shelled ...
Bruno Becker-Kerber, Mírian Liza Alves Forancelli Pacheco, Isaac Daniel Rudnitzki   +2 more
exaly   +6 more sources

Enduring evolutionary embellishment of cloudinids in the Cambrian [PDF]

Royal Society Open Science, 2021
The Ediacaran–Cambrian transition and the following Cambrian Explosion are among the most fundamental events in the evolutionary history of animals. Understanding these events is enhanced when phylogenetic linkages can be established among animal fossils
Tae-Yoon S. Park, Jikhan Jung, Mirinae Lee, Sangmin Lee, Yong Yi Zhen, Hong Hua, Lucas V. Warren, Nigel C. Hughes   +7 more
doaj   +2 more sources

The evolution of reproduction in Ediacaran-Cambrian metazoans. [PDF]

Biol Rev Camb Philos Soc
ABSTRACT The evolution of reproductive style is a fundamental aspect of metazoan life history but has not been explored holistically through the Ediacaran–Cambrian rise of metazoans. Recent molecular clock analyses based on only unequivocal metazoan fossil calibrations suggest that Porifera were present by at least 590 million years ago (Ma), all major
Wood RA, Droser ML.
europepmc   +2 more sources

Dawn of diverse shelled and carbonaceous animal microfossils at ~ 571 Ma [PDF]

Scientific Reports
The Ediacaran-Cambrian transition documents a critical stage in the diversification of animals. The global fossil record documents the appearance of cloudinomorphs and other shelled tubular organisms followed by non-biomineralized small carbonaceous ...
Luana Morais, Bernardo T. Freitas, Thomas Rich Fairchild, Rolando Esteban Clavijo Arcos, Marcel Guillong, Derek Vance, Marcelo Da Roz de Campos, Marly Babinski, Luiz Gustavo Pereira, Juliana M. Leme, Paulo C. Boggiani, Gabriel L. Osés, Isaac D. Rudnitzki, Douglas Galante, Fabio Rodrigues, Ricardo I. F. Trindade   +15 more
doaj   +2 more sources

First occurrence of Cloudina carinata Cortijo et al., 2010 in South America, Tamengo Formation, Corumbá Group, upper Ediacaran of Midwestern [PDF]

Estudios Geologicos, 2019
It is herein presented the unprecedented occurrence of Cloudina carinata Cortijo et al., 2010 in the American continent. This new occurrence expanded the geographic distribution of this species, until now reported from sections in Spain and Siberia.
R. R. Adôrno, D. H.G. Walde, B. D. Erdtmann, M. Denezine, I. Cortijo, D. A. Do Carmo, M. Giorgioni, M. E.A.F. Ramos, G. Fazio   +8 more
doaj   +3 more sources

Cuando la vida anduvo errática: Un factor ambiental para la biomineralización de metazoos [PDF]

Estudios Geologicos, 2019
La repentina aparición de metazoos biomineralizados en las facies calcáreas del Miembro de Pockenbank (Namibia) parece reflejar un rápido cambio en el estado redox, la concentración de calcio y la alcalinidad del océano.
A. J. Kaufman, L. Kriesfeld, P. Vickers-Rich, G. Narbonne   +3 more
doaj   +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

Ediacaran-Cambrian paleosols of Nevada and California. [PDF]

PLoS ONE
The Cambrian and Ediacaran sequence of California and Nevada is rife with unconformities, paleovalleys, paleosols, and fluvial facies. This study confirms shallow marine environments for grey stromatolitic dolostone and shale of northern localities (Mt ...
Gregory J Retallack
doaj   +2 more sources

Una biota transicional Ediacárica–Cámbrica en el anticlinal de Abenójar (Macizo Ibérico, España) [PDF]

Estudios Geologicos, 2018
Se describe una secuencia conteniendo una biota transicional ediacárica–cámbrica, en el valle del arroyo de las Navezuelas, anticlinal de Abenójar (Grupo Ibor, Zona Centroibérica, España).
J. Simón
doaj   +3 more sources