Results 11 to 20 of about 392 (143)

Sesgo tafonómico en los datos de distribución de Cloudina en Siberia [PDF]

Estudios Geologicos, 2019
En Siberia los morfotipos de Cloudina han sido tradicionalmente considerados como una variedad tafonómica de conchas de Anabarites, insertadas una dentro de otra, bajo condiciones hidrodinámicas específicas.
G. Markov, V. Rogov, G. Karlova, D. Grazhdankin   +3 more
doaj   +6 more sources

Reevaluación de la tafonomía de las asociaciones conservadas in situ de Cloudina en la Formación de Tagatiya Guazu, Grupo ediacárico de Itapucumi, Paraguay [PDF]

Estudios Geologicos, 2019
La asociación fósil de la Formación de Tagatiya Guazu (Grupo ediacárico de Itapucumi, Paraguay) representa una oportunidad única para investigar los parámetros paleoecológicos y contribuir con información taxonómica sobre las asociaciones de Cloudina en ...
L. Inglez, L. V. Warren, J. Okubo, M. G. Simões   +3 more
doaj   +7 more sources

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 ...
Mehra A, Maloof A.
europepmc   +5 more sources

Corumbella and in situ Cloudina in association with thrombolites in the Ediacaran Itapucumi Group, Paraguay [PDF]

Terra Nova, 2011
Terra Nova, 23, 382–389, 2011AbstractAn in situ assemblage of Cloudina, thrombolites and an ichnofossil (cf. Archaeonassa), together with fragments of Corumbella werneri, is reported here, from a tidally influenced, shallow, lagoonal setting on a carbonate ramp within the Itapucumi Group, Paraguay.
Warren, Lucas V., Fairchild, Thomas R., Gaucher, Claudio, Boggiani, Paulo C., Poire, Daniel Gustavo, Anelli, Luís E., Inchausti, Julio C. G.   +6 more
core   +7 more sources

Cloudina aggregates from the uppermost Dengying Formation, Three Gorges area, South China, and stratigraphical implications

Precambrian Research, 2022
Numerous issues remain concerning palaeobiology, palaeoecology, and biostratigraphy of Cloudina, an iconic tubular organism of the Ediacaran period. In this study, accumulations of Cloudina are described from the topmost bed of the Dengying Formation in the Baiguotang section of the eastern Three Gorges area, South China.
Zhang, Lei, Chang, Shan, Chen, Can, Wang, Xia, Feng, Qinglai, Steiner, Michael, Yang, Ben, Mason, Roger, She, Zhenbing, Yan, Jiaxin, Vannier, Jean, Forel, Marie-Béatrice, Xiao, Qian, Clausen, Sébastien   +13 more
openaire   +4 more sources

ACloudina-like fossil with evidence of asexual reproduction from the lowest Cambrian, South China

Geological Magazine, 2017
AbstractThe earliest fossil record of animal biomineralization occurs in the latest Ediacaran Period (c. 550 Ma).CloudinaandSinotubulitesare two important tubular taxa among these earliest skeletal fossils. The evolutionary fate ofCloudina-type fossils across the Ediacaran–Cambrian transition, however, remains poorly understood.
JIAN HAN, YAOPING CAI, JAMES D. SCHIFFBAUER, HONG HUA, XING WANG, XIAOGUANG YANG, KENTARO UESUGI, TSUYOSHI KOMIYA, JIE SUN   +8 more
openaire   +2 more sources

Cloudina-Corumbella-Namacalathus association from the Itapucumi Group, Paraguay: Increasing ecosystem complexity and tiering at the end of the Ediacaran [PDF]

Precambrian Research, 2017
Abstract The intriguing Ediacaran fossil Namacalathus is described from limestones of the Tagatiya Guazu Formation, Itapucumi Group, Paraguay. This is the fifth occurrence of the genus in the Ediacaran geological record. The Paraguayan Namacalathus specimens are preserved as partially complete spheroidal cups with an opening at the top and thin ...
Warren, Lucas Verissimo, Quaglio, Fernanda, Simoes, Marcello Guimaraes, Gaucher, Claudio, Riccomini, Claudio, Poire, Daniel G., Freitas, Bernardo Tavares, Boggiani, Paulo C., Sial, Alcides Nobrega   +8 more
openaire   +7 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   +2 more sources

IMPLICAÇÕES ESTRATIGRÁFICAS DAS OCORRÊNCIAS DE ESPÉCIES DO GÊNERO CLOUDINA NO BRASIL

, 2015
O gênero Cloudina é representado atualmente por sete espécies, restritas até o momento ao Edicarano mais superior: 1. Cloudina lucianoi (Beurlen & Sommer, 1957) (Formação Tamengo, Brasil), 2.
Adorno, Rodrigo Rodrigues, Dermeval Aparecido Do Carmo, Matheus Denezine, Walde, Detlef W.G., Guimarães, Edi M., Lucieth Cruz Vieira, Boggiani, Paulo C.   +6 more
openaire   +2 more sources

Caracterização tafonômica e estratigráfica de Cloudina lucianoi (Beurlen & Sommer, 1957) Zaine & Faircild, 1985, no Grupo Corumbá, ediacarano do sudeste do Brasil [PDF]

, 2015
Estudos do fóssil-índice Cloudina Germs 1972, do Neo-ediacarano, representado no Brasil por Cloudina lucianoi (Beurlen & Sommer) Zaine & Fairchild 1985, foram realizados nos calcários da Formação Tamengo, Grupo Corumbá, SW Brasil, nas pedreiras de ...
Felipe van Enck Meira, Meira, Felipe van Enck   +1 more
openaire   +2 more sources