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Cambrian Stage 5
The Wuliuan stage is the fifth stage of the Cambrian, and the first stage of the Miaolingian Series of the Cambrian. It was formally defined by the ICS in 2018. Its base is defined by the first appearance of the trilobite species ''Oryctocephalus indicus''; it ends with the beginning of the Drumian Stage, marked by the first appearance of the trilobite ''Ptychagnostus atavus'' around million years ago. The 'golden spike' that formally defines the base of the period is driven into the Wuliu-Zengjiayan(乌溜-曾家崖)section of the Kaili formation, near Balang Village in the Miaoling Mountains, Guizhou, China. GSSP Three sections were discussed as GSSP candidates: the Wuliu-Zengjiayan section near Balang in Guizhou province (China), a section on Split Mountain in Nevada (USA) and the "Molodo river section" along the Molodo river (Sakha Republic, Russia). The Wuliu-Zengjiayan section is an outcrop of the Kaili Formation in the Wuliu quarry. The first candidate for the begin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Commission On Stratigraphy
The International Commission on Stratigraphy (ICS), sometimes referred to unofficially as the "International Stratigraphic Commission", is a daughter or major subcommittee grade scientific daughter organization that concerns itself with stratigraphy, stratigraphical, geology, geological, and chronology, geochronological matters on a global scale. It is the largest subordinate body of the International Union of Geological Sciences (IUGS). The ICS is essentially a permanent working committee, working subcommittee, which meets far more regularly than the quadrennial meetings scheduled by the IUGS, when it meets as a congress or committee, membership of the whole. Aims One of its main aims, a project begun in 1974, is to establish a multidisciplinary standard and global geologic time scale that will ease paleontology, paleontological and geobiology, geobiological comparisons region to region by benchmarks with stringent and rigorous strata criteria called Global Boundary Stratotype ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drumian
The Drumian is a stage of the Miaolingian Series of the Cambrian. It succeeds the Wuliuan and precedes the Guzhangian. The base is defined as the first appearance of the trilobite ''Ptychagnostus atavus'' around million years ago. The top is defined as the first appearance of another trilobite ''Lejopyge laevigata'' around million years ago. The GSSP is defined in the ''Drumian section'' () in the Drum Mountains, Millard County, Utah, United States. The stage was also named after the Drum Mountains. The section is an outcrop of the Wheeler Formation The Wheeler Shale (named by Charles Walcott) is a Cambrian ( 507 Ma) fossil locality world-famous for prolific agnostid and ''Elrathia kingii'' trilobite remains (even though many areas are barren of fossils) and represents a Konzent ..., a succession of calcareous shales. The precise base of the Drumian is a laminated limestone above the base of the Wheeler Formation. References Cambrian geochronology Geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Geochronology
The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian bio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ovatoryctocara Granulata
''Ovatoryctocara granulata'' is a species of corynexochid trilobite from the Cambrian. Its first appearance is one of the proposals for the base of Wuliuan (The other proposal having been ''Oryctocephalus indicus''). The species was first formally described by the Russian paleontologist N.Ye. Tchernysheva in 1962. ''Ovatoryctocara granulata'' appears close to the base of the ''Ovatoryctocara'' trilobite zone Trilobites are used as index fossils to subdivide the Cambrian period. Assemblages of trilobites define trilobite zones. The ''Olenellus''-zone has traditionally marked the top of the Lower Cambrian, and is followed by the '' Eokochaspis'' zone. ... and can be found up to the ''Kounamkites'' zone. References Oryctocephalidae Cambrian trilobites Fossil taxa described in 1962 Index fossils {{Corynexochida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molodo River
The Molodo (russian: Молодо, sah, Муолада) is a river in Bulunsky District, Sakha Republic, Russia. It is a major left tributary of the Lena. The Molodo is long, and the area of its basin . The banks of the Molodo are not inhabited. River sediments contain alluvial gold and diamonds. Geography The Molodo originates at the confluence of the Molodo-Khangas-Anabyla and the Molodo-Unga-Anabyla in the Central Siberian Plateau, western part of Bulunsky District. From the source it flows southwest, subsequently south, and accepts the Khastakh from the left. Downstream of the mouth of the Khastakh the Molodo turns east, accepts the Daldyn from the left and turns southeast. Below the mouth of the Syungyude the Molodo turns northwest, accepts the Muogdan from the left and turns right. The mouth of the Molodo is upstream of the mouth of the Lena. The drainage basin of the Molodo includes the southwestern part of Bulunsky District and the northwestern part of Zhigansky Di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nevada
Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the List of U.S. states and territories by area, 7th-most extensive, the List of U.S. states and territories by population, 32nd-most populous, and the List of U.S. states and territories by population density, 9th-least densely populated of the U.S. states. Nearly three-quarters of Nevada's people live in Clark County, Nevada, Clark County, which contains the Las Vegas–Paradise, NV MSA, Las Vegas–Paradise metropolitan area, including three of the state's four largest incorporated cities. Nevada's capital is Carson City, Nevada, Carson City. Las Vegas is the largest city in the state. Nevada is officially known as the "Silver State" because of the importance of silver to its history and economy. It is also known as the "Battle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Split Mountain
Split Mountain (or similar) is the name of one of 17 peaks in the United States: There is also a Split Mountain in Canada: * Split Mountain (British Columbia) {{mountainindex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balang
John Philip Bughaw, popularly known as Balang (born November 7, 2008), is a Filipino child dancer and actor. Balang started dancing when he was 4 years old and his cover of Justin Bieber’s " Sorry" has been viewed more than 8 million times having him recognized by Ellen DeGeneres. He since guested on ''The Ellen DeGeneres Show ''The Ellen DeGeneres Show'' (often shortened to ''Ellen'' or ''The Ellen Show'') is an American daytime television variety comedy talk show that was created and hosted by its namesake Ellen DeGeneres. Debuting on September 8, 2003, it was prod ...'' several times. Filmography References Balang returns to 'Ellen,' dances to Ed Sheeran hitRetrieved 2017-06-08. Balang dances to Ed Sheeran’s 'Shape of You'Retrieved 2017-06-08. WATCH: Dancing boy Balang back on 'Ellen,' has dance-off with tWitchRetrieved 2017-06-08. Balang dancing to Ed Sheeran's 'Shape of You' hits 5M viewsRetrieved 2017-06-08. Retrieved 2017-06-08. Balang’s ‘infectious’ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GSSP
A Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. The effort to define GSSPs is conducted by the International Commission on Stratigraphy, a part of the International Union of Geological Sciences. Most, but not all, GSSPs are based on paleontological changes. Hence GSSPs are usually described in terms of transitions between different faunal stages, though far more faunal stages have been described than GSSPs. The GSSP definition effort commenced in 1977. As of 2022, 77 of the 101 stages that need a GSSP have a ratified GSSP. Rules A geologic section has to fulfill a set of criteria to be adapted as a GSSP by the ICS. The following list summarizes the criteria: * A GSSP has to define the lower boundary of a geologic stage. * The lower boundary has to be defined using a primary marker (usually first appearance datum of a fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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