Results 121 to 130 of about 684 (155)
Caracterização tafonômica e estratigráfica de Cloudina lucianoi (Beurlen & Sommer, 1957) Zaine & Faircild, 1985, no Grupo Corumbá, ediacarano do sudeste do Brasil [PDF]
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Skeletogenesis and asexual reproduction in the earliest biomineralizing animal Cloudina
Geology, 2005The 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 ...
Zhe Chen, Xunlai Yuan, Shuhai Xiao
exaly +2 more sources
Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences [PDF]
Carnets De Geologie, 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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Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman
Geology, 2003Biostratigraphic, 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.
Joachim E Amthor +2 more
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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.
Shan Chang, Can Chen, Xia Wang
exaly +4 more sources
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.
Shan Chang, Can Chen, Xia Wang
exaly +4 more sources
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 ...
Rachel A Wood +2 more
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A new species of Cloudina from the terminal Ediacaran of Spain
Precambrian Research, 2010Abstract 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 ...
Mónica Martí Mus +2 more
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New materials reveal Shaanxilithes as a Cloudina-like organism of the late Ediacaran
Precambrian Research, 2021Abstract 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 +4 more
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