Results 1 to 10 of about 12,978 (245)

Ediacaran origin and Ediacaran-Cambrian diversification of Metazoa. [PDF]

Sci Adv
The timescale of animal diversification has been a focus of debate over how evolutionary history should be calibrated to geologic time. Molecular clock analyses have invariably estimated a Cryogenian or Tonian origin of animals while unequivocal animal ...
Carlisle E, Yin Z, Pisani D, Donoghue PCJ.   +3 more
europepmc   +6 more sources

Causes and consequences of end-Ediacaran extinction: An update

Cambridge Prisms: Extinction, 2023
Since the 1980s, the existence of one or more extinction events in the late Ediacaran has been the subject of debate. Discussion surrounding these events has intensified in the last decade, in concert with efforts to understand drivers of global change ...
Simon A.F. Darroch, Emily F. Smith, Lyle L. Nelson, Matthew Craffey, James D. Schiffbauer, Marc Laflamme   +5 more
doaj   +2 more sources

Recurrent photic zone euxinia limited ocean oxygenation and animal evolution during the Ediacaran

Nature Communications, 2023
The Ediacaran Period (~635–539 Ma) is marked by the emergence and diversification of complex metazoans linked to ocean redox changes, but the processes and mechanism of the redox evolution in the Ediacaran ocean are intensely debated. Here we use mercury
Wang Zheng, Anwen Zhou, Swapan K. Sahoo, Morrison R. Nolan, Chadlin M. Ostrander, Ruoyu Sun, Ariel D. Anbar, Shuhai Xiao, Jiubin Chen   +8 more
doaj   +2 more sources

‘Conga lines’ of Ediacaran fronds: insights into the reproductive biology of early metazoans

Royal Society Open Science
Late Ediacaran strata from Newfoundland, Canada (~574–560 Ma) document near-census palaeocommunities of some of the earliest metazoans. Such preservation enables reproductive strategies to be inferred from the spatial distribution of populations of ...
Katie M. Delahooke, Alexander G. Liu, Nile P. Stephenson, Emily G. Mitchell   +3 more
doaj   +2 more sources

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

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

Chronology of Ediacaran sedimentary and biogeochemical shifts along eastern Gondwanan margins

Communications Earth & Environment
Determining causal relationships between environmental change and early animal evolution has been limited by our lack of a robust temporal framework for the Ediacaran Period (635-539 million years ago).
Marjorie D. Cantine, Alan D. Rooney, Andrew H. Knoll, Irene Gómez-Pérez, Badar al Baloushi, Kristin D. Bergmann   +5 more
doaj   +2 more sources

Metacommunity analyses show an increase in ecological specialisation throughout the Ediacaran period.

PLoS Biology, 2022
The first animals appear during the late Ediacaran (572 to 541 Ma); an initial diversity increase was followed reduction in diversity, often interpreted as catastrophic mass extinction.
Rebecca Eden, Andrea Manica, Emily G Mitchell   +2 more
doaj   +2 more sources

Upwelling-driven high organic production in the late Ediacaran

Communications Earth & Environment
The Ediacaran ocean (635-541 million years ago) is typically viewed as a stagnant, redox-stratified ocean with low phosphorus availability. However, this contradicts the high total organic carbon (up to 15 wt%) recorded in the upper Ediacaran Doushantuo ...
Fuencisla Cañadas, Dominic Papineau, Thomas J. Algeo, Chao Li   +3 more
doaj   +2 more sources

Ediacaran-Cambrian paleosols of Nevada and California. [PDF]

PLoS ONE
The Cambrian and Ediacaran sequence of California and Nevada is rife with unconformities, paleovalleys, paleosols, and fluvial facies. This study confirms shallow marine environments for grey stromatolitic dolostone and shale of northern localities (Mt ...
Gregory J Retallack
doaj   +2 more sources

The terminal Ediacaran Tongshan Lagerstätte from South China [PDF]

Nature Communications
Because the informative Burgess Shale-type preservation is uncommon in the Ediacaran, mouldic Ediacara-type preservation provides insight into the early evolution of organisms like metazoans (including typical fronds), protists, and algae.
Jin-bo Hou, Xiang-dong Wang, Zhang-shuai Hou, Jahandar Ramezani, Qing Tang, Shu-zhong Shen   +5 more
doaj   +2 more sources