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Topic: Ediacarian

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In the News (Sun 24 Mar 19)

  iqexpand.com   (Site not responding. Last check: 2007-10-21)
Ediacarian 650 2500-543 MYA Remainder of Proterozoic 2500 __________ ARCHEAN EON 4000 4000-2500 MYA __________ The Phanerozoic Eon (543 MYA to Present) comprises the Paleozoic, Mesozoic, and Cenozoic...
Ediacarian 600 2500-600 MYA Remainder of Proterozoic 2500 __________ ARCHEAN EON Date Undefined __________ The Phanerozoic Eon (543 MYA to Present) comprises the Paleozoic, Mesozoic, and Cenozoic Eras.
The Ediacarian Era and the Cambrian Radiation The Cambrian Radiation 543-510 m yrs was responsible for a massive...
ediacarian.iqexpand.com   (911 words)

 Ediacaran - Wikipedia, the free encyclopedia
The date of the boundary is fairly well constrained at 635 million years ago based on U-Pb (uranium-lead) dates from Namibia and China.
The name comes from the Ediacara (occasionally 'Ediacarian', derived from an Indigenous Australian term for place near water) Hills of South Australia, thus being the only geologic period to have a name originating in the southern hemisphere.
It was in the Ediacara Hills that peculiar Precambrian fossils were found by the geologist Reg Sprigg in 1946, and studied by Martin Glaessner starting in the 1950s.
en.wikipedia.org /wiki/Ediacarian   (753 words)

 Ediacarian and Cambrian   (Site not responding. Last check: 2007-10-21)
Ediacarian fauna 570-543 m yrs (New Scientist 18 Oct 1997).
There is continuing debate about the nature of the Ediacarian fossils and their link to the richly diversifying Cambrian.
Since DNA repair is a differential factor among organisms and stresses vary extensively over periods of beneficent or extreme conditions, this is possibly unlikely.
www.dhushara.com /book/evol/edcamb.htm   (252 words)

Prior to discovery of Pre-Cambrian fossils of soft-bodied organisms in Australia (1947), the pre-Paleozoic was known as the Azoic (without life).
All this changed with the discovery of a soft-bodied fauna in the Ediacarian Hills of South Australia.
Cloud: proposed Ediacarian Period beginning with earliest appearance of soft-bodied metazoans and ending with 1st appearance of skeletonized metazoans (base of Cambrian Period)
www.clas.ufl.edu /users/pciesiel/gly3603c/ediacarian.html   (344 words)

 ediacarian   (Site not responding. Last check: 2007-10-21)
Ediacaran Fauna is a collective term for a variety of early organisms found in rocks older than the Cambrian Period that marked the beginning of life in classical paleontology.
The name Ediacara comes from the Ediacara (Occasionally 'Ediacarian') Hills of South Australia where peculiar precambrian fossils were found by a geologist named Sprigg in 1946.
Martin Glaessner initiated more serious study of these fossils in the 1950s.
www.yourencyclopedia.net /Ediacarian.html   (462 words)

 Name: Ediacara Assemblage
The nature of the sediments indicates that 'flash' events such as turbidity flows and ash-fall were involved in many (but not all) of the Ediacarian deposits.
Sepkoski (1979) suggested that the apparent extinction of many Ediacarian taxa at the base of the Cambrian was due to an increase in deposit feeders, thus removing the evidence of later forms.
It may be that many of the factors described above played a role or that factors such as 'flash' events lead to preservation in some cases while other factors were important in the quieter 'shifting current' conditions suggested by Glaessner and Wade (1966) to explain the quartzite sandstone.
palaeo.gly.bris.ac.uk /palaeofiles/lagerstatten/Ediacara/taphonomy.htm   (528 words)

 Latest Proterozoic plankton from the Amadeus Basin in central Australia   (Site not responding. Last check: 2007-10-21)
The plankton of the Proterozoic is preserved mainly as microfossils known as acritarchs, most of which are considered to be cysts of eukaryotic algae.
Here we report the discovery of a diverse assemblage of large and morphologically complex acritarchs from the Ediacarian age upper Pertatataka Formation in the Amadeus Basin of central Australia.
It is now necessary to suggest an earlier radiation, at least in off-shore environments, or to question the reality of the postulated decrease in diversity.
www.nature.com /nature/journal/v337/n6208/abs/337642a0.html   (409 words)

 Paleobiology: Behavioral and anatomical unity of the earliest burrowing animals and the cause of the "Cambrian ...
The material of major importance to the conclusions presented below (ZPAL) was collected from the topmost Ediacarian to basalmost Cambrian unit, the Nemakit-Daldynian (Manykayan) Kessyusa Formation in 2001 during an expedition to the Khorbusuonka River section in polar Siberia.
Thus, it appears certain that the oldest traces of animal life activity are known from the Ediacarian and were restricted to the sediment surface (Droser et al.
Shallow burrows with a three-lobed lower surface widely occur in strata generally believed to be latest Precambrian in age, for instance in the Okuniec Formation of Ukraine (Gureev 1986; Velikanov 1990), Scandinavian strata with Sabellidites (Jensen and Grant 1998), and the Urusis Formation of Namibia (Jensen et al.
www.findarticles.com /p/articles/mi_qa4067/is_200507/ai_n15348303   (1303 words)

 Cambrian -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-21)
They represent strata from the middle Cambrian and provide us with a wealth of information on early animal diversity.
Fairly extensive pre-Cambrian (Click link for more info and facts about Ediacarian) Ediacarian faunas have been identified in the past 50 years, but their relationships to Cambrian forms are quite obscure.
Extinction of (Click link for more info and facts about Cloudinia) Cloudinia and Namacalathus at the Precambrian-Cambrian boundary in Oman.
www.absoluteastronomy.com /encyclopedia/c/ca/cambrian.htm   (924 words)

 Dr Kath Grey
In 1991, I was invited to join the Macquarie University Ediacarian Research Group, and undertake a PhD study of terminal Proterozoic acritarch assemblages to develop a biostratigraphic control.
AROURI, K., CONAGHAN, P.J., WALTER, M. and GREY, K., 2000, Reconnaissance sedimentology and hydrocarbon biomarkers of Ediacarian microbial mats and acritarchs, lower Ungoolya Group, Officer Basin.
The Ediacarian Acraman bolide impact, 16th Australian Geological Convention, Adelaide, June 2002.
aca.mq.edu.au /People/kgrey.htm   (1075 words)

 k13 The snowball earth hypothesis
The upper part that conformably underlies the Cambrian and is lithologically indistinguishable from it has been found to have megafossils (of soft bodied organisms) that are distinctive.
For these strata, P. Cloud and M. Glaessner, in 1982, suggested the name Ediacarian for a location in Australia where the distinctive "Ediacarian" fossils were first described.
(Cloud and Glaessner proposed, but this has not been formally adopted, that the Paleozoic be extended to include the Ediacrian period 543 to 700 Ma.) Conformable beneath the Ediacarian (also known as the Vendian) strata are glacials that date about 550 to 820 Ma k13iii.
geowords.com /histbooknetscape/k13.htm   (710 words)

 AAP: nomen nudum 28 Research Reports: South Australian Museum   (Site not responding. Last check: 2007-10-21)
Report 2001-2002:- After spending two years on a fellowship at Queen's University in Canada, collaborating with Guy Narbonne on the Ediacarian succession of SE Newfoundland, Jim is currently working on a contract for the SA Museum on the development of the Fossil Gallery.
An over subscribed excursion was run by Jim and Ben McHenry (SA Museum) to the Ediacarian and Cambrian succession of the Central Flinders Ranges for the First International Palaeontological Congress held in Macquarie University, NSW, in July 2002.
Jim and colleagues at SA Museum are working with local communities in South Australia to encourage land managers to take an active role protecting and managing sites of palaeontological interest with view to sustainable, concurrent use of some sites for scientific investigation and nature based tourism.
www.es.mq.edu.au /mucep/aap/nomennudum/issues/28/sa_museum.htm   (306 words)

 Bibliography of Vendian localities   (Site not responding. Last check: 2007-10-21)
Jenkins, R. Functional and ecological aspects of Ediacarian assemblages.
Narbonne, G. M., and Aitken, J. Ediacarian fossils from the Sekwi Brook area, Mackenzie Mountains, northwestern Canada.
Gibson, G. G., Teeter, S. A., and Fedonkin, M. Ediacarian fossils from the Carolina slate belt, Stanly County, North Carolina.
www.ucmp.berkeley.edu /vendian/biogeo/vendbiblio.html   (1652 words)

 Freeman-Lynde GLY126 Precambrian-Paleozoic Boundary
What are the characteristics of the Ediacarian Fauna and the rock unit in which it was discovered?
Summarize the characteristics of the small shelled fossils and trace fossils associated with the Ediacarian Fauna.
Summarize the characteristics of the low-diversity assemblages of small shelly fossils that replace the Ediacara Fauna and the trace fossils associated with these small shelly fossils.
www.arches.uga.edu /~rfreeman/'GLY126_11_PC_Paleoz_Bound.html   (451 words)

 Evolutionary Threads
There is continuing debate whether this could for example have precipitated the Cambrian radiation, which appears rapid from the fossil record, but somewhat slower by mutational clocks and may have extended further back into or even through the preceding Ediacarian epoch.
The difficulty in comparing phenotypic and genotypic evolution is notorious and both methods have pitfalls.
There is continuing debate about the nature of the earlier Ediacarian fossils 570-543 m yrs and their link to the richly diversifying Cambrian.
www.dhushara.com /book/evol/evol.htm   (5136 words)

 Fossil Record & Diversity.S318
Question: Can we use cladistic analysis to refine the resolution of the phylogenetic relationships among members of a fossil assemblage?
Best known Precambrian Fossil assemblage is Ediacarian Period 670-550 mya
1) primitive form is 1+1 or ~0+1 -> Spriggina from the ediacarian
bio.research.ucsc.edu /~barrylab/classes/evolution/CAMBRIAN.HTM   (663 words)

 Early Paleozoic reading notes   (Site not responding. Last check: 2007-10-21)
Hopefully, we will have covered the material on Cambrian life (p.
Note the differences between (1) the Late Proterozoic Ediacarian biota, (2) the earliest Cambrian biota, and (3) the Tommotian biota, and (4) typical Cambrian biota.
What groups dominated in each and what was their ecology?
www.uwm.edu /People/mtharris/Historical/RdNts15.html   (632 words)

 The Precambrian- Growth of Continents   (Site not responding. Last check: 2007-10-21)
Proterozoic- 2.5 - 0.6 BA Archean - 4.0 - 2.5 BA Division based on evolution of multicellular life
recognizing more and more multicellular fauna from latest Precambrian (600-700Ma)- Ediacarian fauna
Gradual transition between Ediacarian rocks and overlying Cambrian
www.clas.ufl.edu /users/emartin/gly2100/lecturenotes/precambrocks.html   (430 words)

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