Results 21 to 30 of about 166 (116)
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 +3 more
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Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences [PDF]
Carnets de géologie (Notebooks on geology), 2012 Cloudina, un important fossile ediacarien, est considere comme l'un des pre-miers organismes biomineralises. Ses affinites biologiques n'ont pas encore ete entierement elucidees : des relations phylogenetiques avec les annelides et les cnidaires sont habituellement envisagees.
Olev VINN, Michał ZATOŃ
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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
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 +20 more
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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 +4 more
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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
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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 +4 more
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Estudios Geologicos, 2019 Se describen y figuran aquí varias unidades estratigráficas características del tránsito Ediacárico-Cámbrico entre Guadalupe y Castañar de Ibor, al norte del Geoparque de Villuercas-Ibores-Jara (Cáceres).
S. Jensen, J. J. Álvaro, T. Palacios
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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 ...
Wood, Rachel +6 more
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Estudios Geologicos, 2019 Una de las esquinas de los mapas geográficos que enlazan las provincias de Badajoz, Cáceres y Toledo contiene unos afloramientos claves para entender el tránsito Ediacárico-Cámbrico de la Zona Centroibérica. En los núcleos del Anticlinorio Extremeño y de
J. J. Álvaro, S. Jensen, T. Palacios
doaj +1 more source