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Coryphidium
''Coryphidium'' is an extinct genus of acritarchs. ''C. elegans'' is from the Tremadocian The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the ..., the lower age of the Ordovocian of Morocco. References External links * ''Coryphidium'' (Unchecked) at AlgaeBase''Coryphidium'' at fossiilid.info Acritarch genera Early Ordovician life {{paleo-eukaryote-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acritarch Genera
Acritarchs are organic microfossils, known from approximately 1800 million years ago to the present. The classification is a catch all term used to refer to any organic microfossils that cannot be assigned to other groups. Their diversity reflects major ecological events such as the appearance of predation and the Cambrian explosion. Definition Acritarchs were originally defined as non-acid soluble (i.e. non-carbonate, non-siliceous) organic-walled microfossils consisting of a central cavity, and whose biological affinities cannot be determined with certainty. Most commonly they are composed of thermally altered acid insoluble carbon compounds (kerogen). Acritarchs may include the remains of a wide range of quite different kinds of organisms—ranging from the egg cases of small metazoans to resting cysts of many kinds of chlorophyta (green algae). It is likely that most acritarch species from the Paleozoic represent various stages of the life cycle of algae that were ancestral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acritarch
Acritarchs are organic microfossils, known from approximately 1800 million years ago to the present. The classification is a catch all term used to refer to any organic microfossils that cannot be assigned to other groups. Their diversity reflects major ecological events such as the appearance of predation and the Cambrian explosion. Definition Acritarchs were originally defined as non- acid soluble (i.e. non-carbonate, non-siliceous) organic-walled microfossils consisting of a central cavity, and whose biological affinities cannot be determined with certainty. Most commonly they are composed of thermally altered acid insoluble carbon compounds ( kerogen). Acritarchs may include the remains of a wide range of quite different kinds of organisms—ranging from the egg cases of small metazoans to resting cysts of many kinds of chlorophyta (green algae). It is likely that most acritarch species from the Paleozoic represent various stages of the life cycle of algae that were ance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenig
In geology, the Arenig (or Arenigian) is a time interval during the Ordovician period and also the suite of rocks which were deposited during this interval. History The term was first used by Adam Sedgwick in 1847 with reference to the "Arenig Ashes and Porphyries" in the neighbourhood of Arenig Fawr, in Merioneth, North Wales. The rock-succession in the Arenig district has been recognized by W. G. Fearnsides (“On the Geology of Arenig Fawr and Moel Llanfnant", Q.J.G.S. vol. lxi., 1905, pp. 608–640, with maps). The above succession is divisible into: # A lower series of gritty and calcareous sediments, the "Arenig Series" as it is now understood; # A middle series, mainly volcanic, with shale, the " Llandeilo Series"; and # The shale and limestones of the Bala Bala may refer to: Places India *Bala, India, a village in Allahabad, India * Bala, Ahor, a village in the Jalore district of Rajasthan * Bala, Raebareli, a village in Uttar Pradesh, India Romania * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klabava
Klabava is a municipality and village in Rokycany District in the Plzeň Region of the Czech Republic. It has about 500 inhabitants. Klabava lies approximately west of Rokycany, east of Plzeň, and south-west of Prague. Transport Klabava is located on the regional railway line from Plzeň to Beroun Beroun (; german: Beraun) is a town in the Central Bohemian Region of the Czech Republic. It has about 20,000 inhabitants. It lies at the confluence of the Berounka and Litavka rivers. Beroun creates a conurbation with Králův Dvůr, former par .... References Villages in Rokycany District {{Plzeň-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tadla
Tadla is a historical and geographical region of Morocco, located in the center of the country, north of the High Atlas mountain range and west of the Middle Atlas. It is the region of origin of the eponymous collection of tribal, semi-nomadic pastoralist population, the Tadla tribes. Nowadays, the historical region of Tadla is mainly part of the administrative region of Béni Mellal-Khénifra, except for the historical territory of the Beni Meskine tribe, which is part of the Casablanca-Settat administrative region. Regions of Morocco History Geography Demography The population of the Tadla is traditionally divided into 9 tribes, mainly of Arab origin: * Aït Robʿa tribe: occupying the western part of the modern Beni Mellal Province, formed under Moulay Ismael (r. 1672–1727) by the merging of an original Tadla tribe (Beni Mellal) with three ''Guich'' tribes (Guettaya, Samguet and Beni Maʿdane)Peyronnet (1919), p.59 * Beni ʿAmir tribe: occupying the northern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tremadocian
The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species '' Iapetognathus fluctivagus'' at the Global Boundary Stratotype Section and Point (GSSP) section on Newfoundland. Naming The Tremadocian is named after the village Tremadoc in Wales. The name was proposed by Adam Sedgwick in 1846 (as "Tremadoc group"). GSSP The GSSP for the beginning of the Tremadocian is the Greenpoint section () in Gros Morne National Park, in western Newfoundland. It is defined as the first appearance of the conodont species '' Iapetognathus fluctivagus''. This horizon can be found 101.8 m above the Greenpoint section datum within bed number 23. The boundary lies within the Broom Point Member, of the Green Point Formation which is part of the Cow Head Group. The first planktonic graptolites appea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
