Ediacaria is a medusoid fossil from the Precambrian Era, or more precisely the Ediacaran Period. It consists of concentric rough circles, radial lines between the circles and a central dome looking vaguely like tree rings. The diameter is 1 to 70 cm. Ediacaria was named by Reg Sprigg in 1847. It was named after the Ediacaran Hills in South Australia. An ammonite fossil Eocene fossil fish of the genus Knightia Petrified wood fossil formed through permineralization. ... The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. ... The Ediacaran Period is the last geological period of the Neoproterozoic Era, just before the Cambrian. ...

Two species are E. flindersi described by Sprigg, and E. booleyi described by Crimes, Insole & Williams in 1995 from a Late Cambrian deposit. The species were named after the Flinders Ranges, and Booley Bay. Ediacaria is possibly a synomym for Aspidella terranovica described in 1872 by Billings. Although Ediacaria is one of the first described organisms from the Precambrian, Aspidella was described earlier, although its age was not understood to be Precambrian. 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... Aspidella is an Ediacaran disk shaped fossil. ...

Ediacaria is found in the Pound Quartzite in the Ediacara Hills, and E. booleyi is from Booley Bay, Wexford Ireland. Ediacaria is also found in Klamath Mountains, northern California. Quartzite Quartzite is a hard, metamorphic rock which was originally sandstone. ...

The significance of this genus is that it is a survivor, lasting into the Cambrian, across the terminal Ediacaran extinction event. Other Cambrian related forms are Velumbrella czarnocki described by Stasinska in 1960 and also documented by Pickerill in 1982. An extinction event (also known as: mass extinction; extinction-level event, ELE) occurs when there is a sharp decrease in the number of species in a relatively short period of time. ... Year 1960 (MCMLX) was a leap year starting on Friday (the link is to a full 1960 calendar). ... 1982 (MCMLXXXII) was a common year starting on Friday of the Gregorian calendar. ...

The time period when Ediacaria existed was from 555 Mya to about 501 Mya.

It is classified as class Scyphozoa (jellyfish) from the Cnidaria, and has also been interpreted as a holdfast. It may have been an anenome attached to the sea floor with tentacles extended upwards. Other interpretations are a bacterial colony, or a fungus. This article is about jellyfish, the sea creatures. ... Classes Anthozoa - Corals and sea anemones Scyphozoa - Jellyfish Staurozoa - Stalked jellyfish Cubozoa - Sea wasps or box jellyfish Polypodiozoa Hydrozoa - Hydroids, hydra-like animals Cnidaria (silent c - pronounced // from New Latin cnida, fr. ... A holdfast is a rootlike plant structure that anchors a seaweed. ... For plants, see Anemone genus For animals, see: Sea anemone Aggregating anemone Magnificent Sea Anemone Tube-dwelling anemone etc For the anemone shrimp, see Hippolytidae Anemone is also a French radar used in the Super Etendard Modernise and the Dassault-Breguet/Dornier Alpha Jet. ... Tentacles can refer to the elongated flexible organs that are present in some animals, especially invertebrates, and sometimes to the hairs of the leaves of some insectivorous plants. ... Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ... Divisions Chytridiomycota Zygomycota Glomeromycota Ascomycota Basidiomycota Deuteromycota The fungi (singular fungus) are a kingdom of eukaryotic organisms. ...

References

• Ediacaran Survivors
• Sprigg, R.C. 1947: Early Cambrian (?) Jellyfishes from the Flinders Ranges, South Australia. Trans. Roy. Soc. S. Aust. 71: 212-224.
• Crimes, T.P.; Insole, A.; Williams, B.P.J. 1995: A rigid-bodied Ediacaran biota from Upper Cambrian strata in Co. Wexford, Éire. Geological Journal 30: 89-109.
• middle Cambrian Age
• Stasinska, A. 1960: Velumbrella czarnockii n. gen., n. sp. - Meduse du Cambrien Inferieur des Monts de Sainte-Croix. Acta Palaeontologica Polonica 5: 337-346.
• Pickerill, R.K. 1982: Cambrian Medusoids from the St. John Group, southwestern New Brunswick. In Current Research, Part B. Geological Survey of Canada 82-1B: 71-76.
• MICROBIAL ORIGIN
• Yreka Terrane