Results 11 to 20 of about 12,978 (245)
The tempo of Ediacaran evolution [PDF]
Science Advances, 2021 New radio-isotopic data bracket the age of late Ediacaran fossil assemblages and two negative carbon isotope excursions.
Chuan Yang +8 more
semanticscholar +9 more sources
Astronomically calibrating early Ediacaran evolution [PDF]
Nature CommunicationsThe current low-resolution chronostratigraphic framework for the early Ediacaran Period hampers a comprehensive understanding of potential trigger mechanisms for environmental upheavals and their connections to evolutionary innovation. Here, we establish
Tan Zhang +10 more
doaj +4 more sources
Ediacaran developmental biology [PDF]
Biological Reviews, 2017 ABSTRACTRocks of the Ediacaran System (635–541 Ma) preserve fossil evidence of some of the earliest complex macroscopic organisms, many of which have been interpreted as animals. However, the unusual morphologies of some of these organisms have made it difficult to resolve their biological relationships to modern metazoan groups. Alternative competing
Dunn, Frances +2 more
core +12 more sources
The Paleontological Society Special Publications, 1992 Ediacaran taxa are a characteristic element of latest Precambrian biotas, with an effectively global distribution. Their time range is not well understood, but with one possible exception from western Canada Ediacaran faunas appear always to post-date the late Precambrian glaciations.
Simon Conway Morris
openaire +2 more sources
Relating Ediacaran Fronds [PDF]
Paleobiology, 2016 Abstract Ediacaran fronds are key components of terminal-Proterozoic ecosystems. They represent one of the most widespread and common body forms ranging across all major Ediacaran fossil localities and time slices postdating the Gaskiers glaciation, but uncertainty over their phylogenetic affinities has led to uncertainty over issues ...
Dececchi, Thomas Alexander +3 more
openaire +4 more sources
Evolution: An Ediacaran ecdysozoan
Current BiologyA new study describes a fossilized ecdysozoan from Ediacaran rocks, extending the body fossil record for this hyper-diverse group and emphasizing the pivotal insights provided by Ediacaran fossils in documenting the early evolutionary history of major animal clades.
openaire +4 more sources
Anais da Academia Brasileira de Ciências, 2014 This study reports the first known occurrence of the Ediacaran fauna in northeastern Brazil (at Pacujá Municipality, northwestern state of Ceará) and presents preliminary interpretations of its significance.
FRANCISCO R.G. BARROSO +3 more
doaj +2 more sources
Sustained shift in the morphology of organic-walled microfossils over the Ediacaran–Cambrian transition [PDF]
Royal Society Open ScienceThe early (approx. 1650–540 Ma) history of eukaryotes was punctuated by several major—but enigmatic—environmental perturbations that potentially influenced the evolution of the Proterozoic biosphere, and the changing structure of Earth systems leading up
Kelly E. Tingle +3 more
doaj +2 more sources
Uncovering the Ediacaran phosphorus cycle
Nature, 2023 Phosphorus is a limiting nutrient that is thought to control oceanic oxygen levels to a large extent1-3. A possible increase in marine phosphorus concentrations during the Ediacaran Period (about 635-539 million years ago) has been proposed as a driver for increasing oxygen levels4-6.
Matthew S. Dodd +13 more
semanticscholar +5 more sources
Geophysical Monograph Series, Page 1-26., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst +8 more
wiley +4 more sources