The Ediacaran (/ ˌ iː d i ˈ æ k ər ə n /; formerly Vendian) biota is a taxonomic period classification that consists of all life forms that were present on Earth during the Ediacaran Period (c. 635–538.8 Mya).These were composed of enigmatic tubular and frond-shaped, mostly sessile, organisms. Trace fossils of these organisms have been found worldwide, and represent the earliest known ...

The Ediacaran Period (/ iː d i ˈ æ k ər ə n, ɛ d i-/ ee-dee-AK-ər-ən, ed-ee-) is a geological period that spans 96 million years from the end of the Cryogenian Period 635 million years ago (Mya), to the beginning of the Cambrian Period 538.8 Mya. It marks the end of the Proterozoic Eon, and the beginning of the Phanerozoic Eon.It is named after the Ediacara Hills of South Australia.

El período Ediacárico o periodo Ediacarano (en referencia a las montañas Ediacara), una división de la escala temporal geológica, es el tercer y último período geológico de la era Neoproterozoica.Comienza hace unos 635 millones de años y finaliza hace 542,0 ±1,0 millones de años (es seguido por el Cámbrico).Las fechas se han fijado sobre la base de criterios de …

O Pré-Cambriano (ou Precâmbrico) é o período de tempo desde a formação da Terra há cerca de 4600 milhões de anos (Ga) até ao início do Período Cambriano, há cerca de 541,0 ± 1,0 Ma.Este precede o atual éon Fanerozoico, e é um superéon dividido, na escala de tempo geológico, em: Arqueano e Proterozoico (intervalos geológicos formais), além do Hadeano (intervalo …

De Ediacarische biota is het vroegst bekende, complexe meercellige leven op Aarde. Het is bekend uit afzettingen die binnen het geologisch tijdperk Ediacarium vallen, dat duurde van ongeveer 630 tot 542 miljoen jaar geleden (). De Ediacarische biota omvat de oudst bekende dieren (Metazoa), die geen skelet bezaten, maar desondanks vaak opvallend goed als fossiel …

Biogénesis y abiogénesis. El término 'biogénesis' fue acuñado por Henry Charlton Bastian para referirse a la generación de una forma de vida a partir de materiales no vivos; sin embargo, Thomas Henry Huxley eligió el término 'abiogénesis' y redefinió la biogénesis para la vida que surge de la vida preexistente. [4] La generación de vida a partir de material no vivo se …

Ediacara Hills: stony ground: place in Australia where the Ediacaran biota fossils were found Cambrian: c. 538.8 Ma: Latin Cambria: Wales: ref. to the place in Great Britain where Cambrian rocks are best exposed Ordovician: c. 485.4 Ma: Celtic Ordovices: Tribe in north Wales, where the rocks were first identified Silurian: c. 443.8 Ma: Ctc. Silures

Arkarua adami is a small, Precambrian disk-like fossil with a raised center, a number of radial ridges on the rim, and a five-pointed central depression marked with radial lines of five small dots from the middle of the disk center. Fossils range from 3 to 10 mm in diameter. Arkarua is known only from the Ediacaran beds of the Flinders Ranges in South Australia.

The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. It is famous for the exceptional preservation of the soft parts of its fossils. At old (middle Cambrian), it is one of the earliest fossil beds containing soft-part imprints. . The rock unit is a black shale and crops out at a number of localities near the town of Field in Yoho …

Tribrachidium was originally described by Martin Glaessner as a problematic organism, one that is excluded from all known major groups of animals by its tri-radial symmetry. However, Tribrachidium's superficial resemblance to edrioasteroid echinoderms was well known to researchers and discussed. Later, Glaessner rejected any putative affinities of this animal with …