Results 11 to 20 of about 684 (155)

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

New insight into the global record of the Ediacaran tubular morphotype: a common solution to early multicellularity [PDF]

Royal Society Open Science
The tubular morphogroup is a common component of Earth’s first complex, multicellular communities—the Ediacaran biota—and offers valuable insight into biological traits that are fundamental to animal life because they have intriguing links to metazoan ...
Rachel L. Surprenant, Mary L. Droser
doaj   +2 more sources

Ultrastructure of Ediacaran cloudinids suggests diverse taphonomic histories and affinities with non-biomineralized annelids. [PDF]

Sci Rep, 2020
Cloudinids have long been considered the earliest biomineralizing metazoans, but their affinities have remained contentious and undetermined. Based on well-preserved ultrastructures of two taxa, we here propose new interpretations regarding both their ...
Yang B, Steiner M, Schiffbauer JD, Selly T, Wu X, Zhang C, Liu P.   +6 more
europepmc   +3 more sources

Localized and Transient Oxygenation of Shallow Oceans of Southwestern Laurentia at the Ediacaran-Cambrian Boundary. [PDF]

Geobiology
ABSTRACT The Ediacaran–Cambrian boundary, which precedes one of the most significant biotic diversification events in Earth's history, is associated with a global negative carbon isotope excursion termed the BAsal Cambrian carbon isotope Excursion (BACE).
Chanchai W, Nelson LL, Smith EF, Hardisty DS, Lonsdale MC, Burke JE, Lau KV.   +6 more
europepmc   +2 more sources

Análisis paleontológicos a través límite Ediacárico-Cámbrico, Grupo Alto Corumbá, Brasil [PDF]

Estudios Geologicos, 2019
Se presenta en este trabajo el análisis paleontológico de 26 especies fósiles muestradas en cinco cortes de las Formaciones de Tamengo y Guaicurus en las regines de Corumbá y Ladário: canteras de Corcal y Laginha, Porto Sobramil, Porto Figueiras y ...
R.R. Adôrno, D.H.G. Walde, D.A. Do Carmo, M. Denezine, I. Cortijo, E.A.M. Sanchez, T.C. Tobias, G. Fazio, L.V. Warren, B.D. Erdtmann, Y. Cai, M. Giorgioni, M.E.A.F. Ramos, M.C. Baptista, E.M. Guimarães, M. F. Figueiredo, G.J. Germs   +16 more
doaj   +4 more sources

First macrobiota biomineralization was environmentally triggered. [PDF]

Proc Biol Sci, 2017
Why large and diverse skeletons first appeared ca 550 Ma is not well understood. Many Ediacaran skeletal biota show evidence of flexibility, and bear notably thin skeletal walls with simple, non-hierarchical microstructures of either aragonite or high-Mg
Wood R, Ivantsov AY, Zhuravlev AY.
europepmc   +3 more sources

Discovery of bilaterian-type through-guts in cloudinomorphs from the terminal Ediacaran Period. [PDF]

Nat Commun, 2020
Schiffbauer JD, Selly T, Jacquet SM, Merz RA, Nelson LL, Strange MA, Cai Y, Smith EF.   +7 more
europepmc   +6 more sources

Taxonomic revision of Ediacaran tubular fossils: Cloudina, Sinotubulites and Conotubus [PDF]

Journal of Paleontology, 2021
AbstractThe Ediacaran tubular fossils Cloudina, Sinotubulites, and Conotubus are taxonomically revised with type materials. It is proposed that Aulophycus lucianoi Beurlen and Sommer, 1957, is not a senior synonym of Cloudina hartmannae Germs, 1972. Instead, most of its syntypes may be assigned to Sinotubulites or other taxa.
Ben Yang, Lucas V. Warren, Michael Steiner, Emily F. Smith, Pengju Liu   +4 more
openaire   +3 more sources

The Ediacaran-Cambrian Radiation of Animals within the Villuercas-Ibores-Jara UNESCO Global Geopark, Spain [PDF]

Geoconservation Research, 2021
Across the Ediacaran to Cambrian transition, some 541 Ma, the Earth's biosphere changed from one dominated by microbial organisms to one where multicellular organisms, including animals, rose to importance. Within a few tens of millions of years into the
Iván Cortijo, Teodoro Palacios, Sören Jensen, José María Barrera   +3 more
doaj   +1 more source