Results 21 to 30 of about 188 (119)

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.
Iván Cortijo, Yaoping Cai, Hong Hua, James D. Schiffbauer, Shuhai Xiao   +4 more
openaire   +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

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

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   +1 more source

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

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   +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

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

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   +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

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

Chemo- and biostratigraphy of the Gaojiashan section (northern Yangtze platform, South China): a new Pc-C boundary section [PDF]

Fossil Record, 2015
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 ...
A. Gamper, U. Struck, F. Ohnemueller, C. Heubeck, S. Hohl   +4 more
doaj   +1 more source

Borings in Cloudina Shells: Complex Predator-Prey Dynamics in the Terminal Neoproterozoic

PALAIOS, 2003
Abstract Predation as an important driver of evolutionary change long has been assumed, despite difficulties to substantiate it with specific examples of predatory interaction, especially for the early Paleozoic diversification of animal life. This study corroborates the existence of shell-drilling predation in the uppermost Neoproterozoic of China ...
H. HUA, B. R. PRATT, L.-Y. ZHANG
openaire   +3 more sources