Results 91 to 100 of about 166 (116)

New materials reveal Shaanxilithes as a Cloudina-like organism of the late Ediacaran

Precambrian Research, 2021
Abstract Shaanxilithes is a potential index fossil of late Ediacaran for its cosmopolitan occurrences and narrow stratigraphic range. However, its morphology and taxonomy has long been controversial and its biological affinities remain problematic, with interpretations ranging from pogonophorans, sedimentary structures, trace fossils, algae, to ...
Xin Wang, Xingliang Zhang, Yuan Zhang, Linhao Cui, Luoyang Li   +4 more
openaire   +1 more source

Skeletogenesis and asexual reproduction in the earliest biomineralizing animal Cloudina

Geology, 2005
The tubular fossil Cloudina is emerging as an important Ediacaran index fossil. How- ever, its morphology, skeletogenesis, reproduction, and phylogenetic affinity have not been fully resolved. New material from the Dengying Formation of south China confirms that Cloudina tubes consist of eccentrically and sometimes deeply nested funnels and that the ...
Hong Hua, Zhe Chen, Xunlai Yuan, Luyi Zhang, Shuhai Xiao   +4 more
openaire   +1 more source

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   +3 more sources

Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman

Geology, 2003
Biostratigraphic, carbon isotope, and U-Pb zircon geochronological data from the Ara Group of Oman indicate an abrupt last appearance of Cloudina and Namacalathus coincident with a large-magnitude, but short-lived negative excursion in the carbon isotope composition of seawater that is globally coincident with the Precambrian-Cambrian boundary.
Amthor, Joachim E., Grotzinger, John P., Schröder, S., Bowring, Samuel A., Ramezani, Jahandar, Martin, Mark W., Matter, Albert   +6 more
openaire   +4 more sources

A new species of Cloudina from the terminal Ediacaran of Spain

Precambrian Research, 2010
Abstract The terminal Ediacaran genus Cloudina includes some of the earliest biomineralized fossils. It consists of a tube formed by stacked funnel-shaped elements, and is usually interpreted as the external skeleton of an early metazoan. Although a number of species have been described within this genus, their distinctiveness remains unclear and ...
Cortijo Sánchez, Iván, Martí Mus, Mónica, Jensen, Rolf Sören, Palacios Medrano, Teodoro   +3 more
openaire   +2 more sources

Cloudina-microbial reef resilience to substrate instability in a Cadomian retro-arc basin of the Iberian Peninsula

Precambrian Research, 2020
Abstract The Navalpino anticline of the Central Iberian Zone provides a unique case study of well-exposed late Ediacaran reefs. Drone images show their spatial arrangement as tens of shelly-microbial patch, biohermal and complex reefs encased in a dominantly shaly succession.
Álvaro Blasco, José Javier, Cortijo Sánchez, Iván, Jensen, Rolf Sören, Martí Mus, Mónica, Palacios Medrano, Teodoro   +4 more
openaire   +2 more sources

Some observations on Cloudina, a terminal Proterozoic index fossil from Namibia

Journal of African Earth Sciences, 2001
An overview is provided of past and present concepts about Cloudina, a Neoproterozoic tube-building organism, significant for its early use of biomineralisation. In the past, Cloudina tubes from the Nama limestones of Namibia have had to be studied in thin- or polished sections, but some observations are reported here on silicified tubes extracted ...
openaire   +1 more source

Taxonomy of the late Ediacaran index fossil Cloudina and a new similar taxon from South China

Precambrian Research, 2017
Abstract Cloudina is a late Ediacaran tubular fossil known from almost every continent. It is typically a mm- to cm-sized conical tube consisting of multiple, nested, funnel-shaped elements, forming the diagnostic “funnel-in-funnel” tube construction.
Yaoping Cai, Iván Cortijo, James D. Schiffbauer, Hong Hua   +3 more
openaire   +1 more source

Tube growth patterns and microbial mat-related lifestyles in the Ediacaran fossil Cloudina, Gaojiashan Lagerstätte, South China

Gondwana Research, 2014
Abstract Cloudina are important Ediacaran index fossils, as they have a consistent terminal Neoproterozoic age and a worldwide distribution. The morphology of Cloudina has been reconstructed primarily on the basis of three-dimensionally preserved Chinese and Spanish specimens, but questions remain surrounding their phylogenetic placement ...
Yaoping Cai, Hong Hua, James D. Schiffbauer, Bo Sun, Xunlai Yuan   +4 more
openaire   +1 more source