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Encyclopedia > Ediacaran
The Ediacaran[5][6]
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Ediacaran
 
 
 
 
 
 
 
Last Ediacaran communities
Last putative Ediacaran
Embryos?
First Ediacaran megafossil
Marinoan Glaciation
Aspidella discs
Charnia
Neoproterozoic
(last æon of the Precambrian)

Phanerozoic The Cryogenian Period (from Greek cryos ice and genesis birth) is the second geologic period of the Neoproterozoic Era, followed by the Ediacaran Period. ... The Cambrian is a major division of the geologic timescale that begins about 542 ± 1. ... The Doushantuo Formation is a lagerstätte in Guizhou Province, China that is notable for being one of the oldest fossil beds to contain highly preserved fossils. ... One computer simulation of conditions during the Snowball Earth period. ... A glaciation (a created composite term meaning Glacial Period, referring to the Period or Era of, as well as the process of High Glacial Activity), often called an ice age, is a geological phenomenon in which massive ice sheets form in the Arctic and Antarctic and advance toward the equator. ... The Cryogenian Period (from Greek cryos ice and genesis birth) is the second geologic period of the Neoproterozoic Era, followed by the Ediacaran Period. ... Aspidella is an Ediacaran disk shaped fossil. ... The Neoproterozoic Era is the unit of geologic time from 1,000 to 542 +/- 0. ... In general usage, an eon (sometimes spelled aeon) is a very long period of time. ... The Precambrian (Pre-Cambrian) is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. ... During the Phanerozoic the biodiversity shows a steady but not monotonic increase from near zero to several thousands of genera. ...

Axis scale: millions of years ago.

The Ediacaran Period (named after the Ediacara Hills of South Australia) is the last geological period of the Neoproterozoic Era, just preceding the Cambrian Period of the Paleozoic Era. Its status as an official geological period was ratified in March 2004 by the International Union of Geological Sciences (IUGS) and announced on May 13, 2004, the first new geological period declared in 120 years.[1][2] The type section is in the Flinders Ranges in South Australia. It overlaps, but is shorter than the Vendian period, a name that was earlier proposed in Russia. Ediacara Hills is a hill range in the northern Flinders Ranges of South Australia, around 650km north of Adelaide. ... Capital Adelaide Government Constitutional monarchy Governor Marjorie Jackson-Nelson Premier Mike Rann (ALP) Federal representation  - House seats 11  - Senate seats 12 Gross State Product (2004-05)  - Product ($m)  $59,819 (5th)  - Product per capita  $38,838/person (7th) Population (End of September 2006)  - Population  1,558,200 (5th)  - Density  1. ... The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... The Neoproterozoic Era is the unit of geologic time from 1,000 to 542 +/- 0. ... The Cambrian is a major division of the geologic timescale that begins about 542 ± 1. ... The Paleozoic Era (from the Greek palaio, old and zoion, animals, meaning ancient life) is the earliest of three geologic eras of the Phanerozoic eon. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... IUGS logo The International Union of Geological Sciences (IUGS) is an international non-governmental organization devoted to international cooperation in the field of geology. ... is the 133rd day of the year (134th in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... A Global Boundary Stratotype Section and Point, abbreviated GSSP, is an internationally agreed upon stratigraphic section which serves as the reference section for a particular boundary on the geologic time scale. ... Flinders Ranges is a national park in South Australia (Australia), 384 km north of Adelaide. ...

Contents

Base of the Ediacaran

Although the Ediacaran Period does contain soft bodied fossils, it is unusual in comparison to later periods because its beginning is not defined by a change in the fossil record. Rather, the beginning is defined at the base of a chemically distinctive carbonate layer, referred to as a "cap carbonate", because it caps glacial deposits and indicates a sudden climatic change at the end of an ice age. This bed is characterized by an unusual depletion of 13C, and is considered by many scientists to be of global extent, although this is controversial. For other uses, see Fossil (disambiguation). ... It has been suggested that this article or section be merged into Fossil. ... In organic chemistry, a carbonate is a salt of carbonic acid. ... Cap carbonates are layers of distinctively textured carbonate rocks which typically form the uppermost layer of sedimentary sequences reflecting major glaciations in the geological record. ... Variations in CO2, temperature and dust from the Vostok ice core over the last 400 000 years For the animated movie, see Ice Age (movie). ...


Dating

No dating has been possible at the type section of the Ediacaran Period in South Australia. Therefore the age range of 635 to 542 million years before the present is based on correlations to other countries where dating has been possible. The base age of approximately 635 million years ago is based on U-Pb (uranium-lead) isochron dating from Namibia.[3] Applying this age to the base of the Ediacaran assumes that individual cap carbonates are synchronous around the world and that the correct cap carbonate layers have been correlated between Australian and Namibia. This is controversial because an age of about 580 million years has been obtained in association with glacial rocks in Tasmania which some scientists tentatively correlate with those just beneath the Ediacaran rocks of the Flinders Ranges.[4] The age of the top is the same as the widely recognised age for the base of the Cambrian Period.[2] Absolute dating is the process of determining a specific archaeological date. ... General Name, symbol, number uranium, U, 92 Chemical series actinides Group, period, block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Standard atomic weight 238. ... For Pb as an abbreviation, see PB. General Name, Symbol, Number lead, Pb, 82 Chemical series Post-transition metals or poor metals Group, Period, Block 14, 6, p Appearance bluish gray Standard atomic weight 207. ... Iscochron dating is a type of radiometric dating. ... Slogan or Nickname: The Apple Isle; Holiday Isle Motto(s): Ubertas et Fidelitas (Fertility and Faithfulness) Other Australian states and territories Capital Hobart Government Constitutional monarchy Governor William Cox Premier Paul Lennon (ALP) Federal representation  - House seats 5  - Senate seats 12 Gross State Product (2004-05)  - Product ($m)  $16,114... The Cambrian is a major division of the geologic timescale that begins about 542 ± 1. ...


Biota

Main article: Ediacaran biota

The animal fossil record from this period is sparse, possibly because animals had yet to evolve hard shells, which make for easier fossilization. The Ediacaran biota include the oldest definite multicellular organisms, and the most common types resemble segmented worms, fronds, disks, or immobile bags. They bear little resemblance to modern lifeforms, and their relationship even with the later lifeforms of the Cambrian explosion is difficult to interpret. More than 100 genera have been described, and well known forms include Arkarua, Charnia, Dickinsonia, Ediacaria, Marywadea, Onega, Pteridinium, and Yorgia. Dickinsonia costata, an Ediacaran organism of unknown affinity, with a quilted appearance. ... Wild-type Caenorhabditis elegans hermaphrodite stained to highlight the nuclei of all cells Multicellular organisms are organisms consisting of more than one cell, and having differentiated cells that perform specialized functions. ... For other uses, see Scientific classification (disambiguation). ... The Cambrian explosion is the geologically kukko sudden appearance in the fossil record of the ancestors of familiar animals, starting about 542 million years ago (Mya). ... For other uses, see Genus (disambiguation). ... Arkaruais 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 5 small dots from the middle of the disk center. ... Species Charnia wardi Charnia masoni Charnia is the genus name given to a frond-like Precambrian lifeform with segmented ridges branching alternately to the right and left from a zig-zag medial suture. ... Species Dickinsonia is an ancient ovoid fossil with somewhat radial tubes from a (sometimes missing) central ridge. ... Ediacaria is a medusoid fossil from the Precambrian Era, or more precisely the Ediacaran Period. ... Marywadea is an Ediacaran fossil. ... Onega stepanovi is a fossil from the Ediacaran Period, described by Fedonkin in 1976. ... Pteridinium is a fossil found in a number of Precambrian deposits worldwide. ... Yorgia waggoneri is a fossil from the Ediacaran period. ...


See also

List of fossil sites: // Afar Depression, Ethiopia, Pliocene Awash River, Afar Depression, Ethiopia, Australopithecus afarensis, Lucy, Pliocene, 3. ...

References

  1. ^ Knoll, A.H.; Walter, M.R., Narbonne, G.M., Christie-blick, N. (2004). "A new period for the geologic time scale". Science(Washington) 305 (5684): 621-622. 
  2. ^ a b Ogg, J.G. (2004). "Status of Divisions of the International Geologic Time Scale". Lethaia 37 (2): 183-199. Retrieved on 2007-05-05. 
  3. ^ Hoffmann, K.H.; Condon, D.J., Bowring, S.A., Crowley, J.L. (2004-09-01). "U-Pb zircon date from the Neoproterozoic Ghaub Formation, Namibia: Constraints on Marinoan glaciation". Geology 32 (9): 817-820. DOI:10.1130/G20519.1. 
  4. ^ Calver, C.R.; Black, L.P., Everard, J.L., Seymour, D.B. (2004-10-01). "U-Pb zircon age constraints on late Neoproterozoic glaciation in Tasmania". Geology 32 (10): 893-896. DOI:10.1130/G20713.1. 
  5. ^ Cite error 8; No text given.
  6. ^ Hofmann, H.J.; Narbonne, G.M., Aitken, J.D. (1990). "Ediacaran remains from intertillite beds in northwestern Canada". Geology 18 (12): 1199-1202. 

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 125th day of the year (126th in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 244th day of the year (245th in leap years) in the Gregorian calendar. ... A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 274th day of the year (275th in leap years) in the Gregorian calendar. ... A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ...

External links

  • "Geological time gets a new period: Geologists have added a new period to their official calendar of Earth's history—the first in 120 years", BBC, 17 May, 2004. 
  • Ediacaran Period. GeoWhen Database. Retrieved on January 5, 2006.
  • Introduction to the Vendian Period
  • Introduction to the Ediacaran Fauna
  • transcript - Catalyst (Australian Broadcasting Corporation)
  • Mistaken Point Fauna : The Discovery
Proterozoic eon
Paleoproterozoic era Mesoproterozoic era Neoproterozoic era
Siderian Rhyacian Orosirian Statherian Calymmian Ectasian Stenian Tonian Cryogenian Ediacaran
Wikimedia Commons has media related to:
Ediacaran

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Qwika - similar:Ediacaran (1497 words)
Ediacaran period Geologic timescale of the Precambrian (millions of years ago) ImageSize = width:175 height:355 PlotArea = left:40 right:5 bottom:135 top:45 AlignBars = justify Period = from:542 till:670 TimeAxis = orientation:vertical ScaleMajor = unit:year increment:25 start:550 ScaleMinor = unit:year increment:10 start:550 Colors = id:eon value:r...
Kimberella quadrata is a fossil animal from the Ediacaran or Vendian fauna.
Variations in CO2, temperature and dust from the Vostok ice core over the last 400 000 years An ice age is a period of long-term downturn in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers ("glaciation").
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