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Hettangian Genera
The Hettangian is the earliest age and lowest stage of the Jurassic Period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199.3 ± 0.3 Ma (million years ago). The Hettangian follows the Rhaetian (part of the Triassic Period) and is followed by the Sinemurian. In European stratigraphy the Hettangian is a part of the time span in which the Lias was deposited. An example is the British Blue Lias, which has an upper Rhaetian to Sinemurian age. Another example is the lower Lias from the Northern Limestone Alps where well-preserved but very rare ammonites, including ''Alsatites'', have been found. Stratigraphic definitions The Hettangian was introduced in the literature by Swiss palaeontologist, Eugène Renevier, in 1864. The stage takes its name from Hettange-Grande, a town in north-eastern France, just south of the border with Luxembourg on the main road from Luxembourg City to Metz. The base of the Hettangian Stage (which is also the base of the Lower ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Commission On Stratigraphy
The International Commission on Stratigraphy (ICS), sometimes unofficially referred to as the International Stratigraphic Commission, is a daughter or major subcommittee grade scientific organization that concerns itself with stratigraphy, stratigraphical, geology, geological, and chronology, geochronological matters, worldwide. 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 Section and Points ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annum
A year is a unit of time based on how long it takes the Earth to orbit the Sun. In scientific use, the tropical year (approximately 365 solar days, 5 hours, 48 minutes, 45 seconds) and the sidereal year (about 20 minutes longer) are more exact. The modern calendar year, as reckoned according to the Gregorian calendar, approximates the tropical year by using a system of leap years. The term 'year' is also used to indicate other periods of roughly similar duration, such as the lunar year (a roughly 354-day cycle of twelve of the Moon's phasessee lunar calendar), as well as periods loosely associated with the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons are generally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metz
Metz ( , , , then ) is a city in northeast France located at the confluence of the Moselle (river), Moselle and the Seille (Moselle), Seille rivers. Metz is the Prefectures in France, prefecture of the Moselle (department), Moselle Departments of France, department and the seat of the parliament of the Grand Est Regions of France, region. Located near the Tri-border area, tripoint along the junction of France, Germany and Luxembourg,Says J.M. (2010) La Moselle, une rivière européenne. Eds. Serpenoise. the city forms a central part of the European Greater Region and the SaarLorLux euroregion. Metz has a rich 3,000-year history,Bour R. (2007) Histoire de Metz, nouvelle édition. Eds. Serpenoise. having variously been a Celts, Celtic ''oppidum'', an important Gallo-Roman city,Vigneron B. (1986) Metz antique: Divodurum Mediomatricorum. Eds. Maisonneuve. the Merovingian capital of Austrasia,Huguenin A. (2011) Histoire du royaume mérovingien d'Austrasie. Eds. des Paraiges. p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luxembourg City
Luxembourg (; ; ), also known as Luxembourg City ( or ; ; or ), is the capital city of Luxembourg and the Communes of Luxembourg, country's most populous commune. Standing at the confluence of the Alzette and Pétrusse rivers in southern Luxembourg, the city lies at the heart of Western Europe, situated by road from Brussels and from Cologne. The city contains Luxembourg Castle, established by the Franks in the Early Middle Ages, around which a settlement developed. , Luxembourg City has a population of 136,208 inhabitants, which is more than three times the population of the country's second most populous commune (Esch-sur-Alzette). The population consists of 160 nationalities. Foreigners represent 70.4% of the city's population, whilst Luxembourgers represent 29.6% of the population; the number of foreign-born residents in the city rises steadily each year. In 2024, Luxembourg was ranked by the International Monetary Fund, IMF as having the highest GDP per capita in the w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luxembourg
Luxembourg, officially the Grand Duchy of Luxembourg, is a landlocked country in Western Europe. It is bordered by Belgium to the west and north, Germany to the east, and France on the south. Its capital and most populous city, Luxembourg City, is one of the four institutional seats of the European Union and hosts several EU institutions, notably the Court of Justice of the European Union, the highest judicial authority in the EU. As part of the Low Countries, Luxembourg has close historic, political, and cultural ties to Belgium and the Netherlands. Luxembourg's culture, people, and languages are greatly influenced by France and Germany: Luxembourgish, a Germanic language, is the only recognized national language of the Luxembourgish people and of the Grand Duchy of Luxembourg; French is the sole language for legislation; and both languages along with German are used for administrative matters. With an area of , Luxembourg is Europe's seventh-smallest count ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlantic, North Atlantic, the French West Indies, and List of islands of France, many islands in Oceania and the Indian Ocean, giving it Exclusive economic zone of France, one of the largest discontiguous exclusive economic zones in the world. Metropolitan France shares borders with Belgium and Luxembourg to the north; Germany to the northeast; Switzerland to the east; Italy and Monaco to the southeast; Andorra and Spain to the south; and a maritime border with the United Kingdom to the northwest. Its metropolitan area extends from the Rhine to the Atlantic Ocean and from the Mediterranean Sea to the English Channel and the North Sea. Its Regions of France, eighteen integral regions—five of which are overseas—span a combined area of and hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hettange-Grande
Hettange-Grande (; ; Lorraine Franconian: ''Grouss-Hetténgen'') is a commune in the Moselle department in Grand Est in north-eastern France. The town gives its name to the Hettangian age, the earliest age of the Jurassic period of the geologic timescale. Geography Hettange-Grande is located close to the borders between Belgium, France, Germany, and Luxembourg. Transportation The commune is located on the A31 autoroute (also called the Lorraine-Bourgogne autoroute) which links the Burgundy region with Luxembourg. Departmental road 653, which runs from Thionville to Frisange (Luxembourg), crosses the town centre. History Hettange-Grande was part of the Duchy of Luxembourg until the 1659 Treaty of the Pyrenees, when it was ceded to France during the first Partition of Luxembourg, along with the nearby town of Thionville. Population Twin towns Hettange-Grande is twinned with: * Sinzig, Germany, since 1966, * Pederobba, Italy, since 1977 See also * Communes of the Mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eugène Renevier
Eugène Renevier (26 March 1831 – 4 May 1906) was a Swiss geologist. Biography Renevier was born in Lausanne, Switzerland on 26 March 1831, as a descendant of a noble family. After about three years of study at the polytechnical school of Stuttgart, Renevier in 1851 went to Geneva to study under F. J. Pictet. In 1854 he went to Paris to attend the lectures of Hébert and to study fossil nummulites found in the limestone of the Alps. From 1859 to 1881 he was an associate professor of geology and mineralogy, then a full professor of geology and paleontology at the Academy in Lausanne (1881–1906). In 1890 the academy attained the name and status of a university. In 1898–90 he was rector of the University of Lausanne. For many years, he also served as curator of the cantonal museum of geology (1874–1906). He is distinguished for his researches on the geology and paleontology of the Alps, on which subjects he published numerous papers in the proceedings of the scientifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alsatites
''Alsatites '' is an extinct genus of cephalopod belonging to the Ammonite subclass. They lived during the Hettangian The Hettangian is the earliest age and lowest stage of the Jurassic Period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199.3 ± 0.3 Ma (million years ago). The Hettangian follows the Rhaetian (part of the Triass ... and are generally extremely evolute, many whorled. Keel broad and blunt organisms, they also exhibit a primary ribbing which is close and persistent. References ;Notes ;Bibliography :* Arkell, et al.,1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press, Revised 2013, Part L, Michale K. Howarth :* External linksBlog post about Hettangian ammonites by Peter Reiter {{Taxonbar, from=Q4735776 Early Jurassic ammonites Jurassic ammonites of North America Hettangian genera Arietitidae Ammonitida genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Limestone Alps
The Northern Limestone Alps (), also called the Northern Calcareous Alps, are the ranges of the Eastern Alps north of the Central Eastern Alps located in Austria and the adjacent Bavarian lands of southeastern Germany. The distinction from the latter group, where the higher peaks are located, is based on differences in geological composition. Geography If viewed on a west–east axis, the Northern Limestone Alps extend from the Rhine valley and the Bregenz Forest in Vorarlberg, Austria in the west extending along the border between the German federal-state of Bavaria and Austrian Tyrol, through Salzburg, Upper Austria, Styria and Lower Austria and finally ending at the Wienerwald at the city-limits of Vienna in the east. The highest peaks in the Northern Limestone Alps are the Parseierspitze () in the Lechtal Alps,Reynolds, Kev (2010). ''Walking in the Alps'', Cicerone, . and the Hoher Dachstein (). Other notable peaks in this range include the Zugspitze, (), located on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Lias
The Blue Lias is a formation (stratigraphy), geological formation in southern, eastern and western England and parts of South Wales, part of the Lias Group. The Blue Lias consists of a sequence of limestone and shale layers, laid down in latest Triassic and early Jurassic times, between 195 and 200 million years ago. The Blue Lias is famous for its fossils, especially ammonites. Its age corresponds to the Rhaetian to lower Sinemurian stages of the geological timescale, thus fully including the Hettangian stage. It is the lowest of the three divisions of the Lower Jurassic period and, as such, is also given the name ''Lower Lias''. stratigraphy, Stratigraphically it can be subdivided into three Geological unit#Lithostratigraphic units, members: the Wilmcote Limestone, Saltford Shale and Rugby, Warwickshire, Rugby Limestone. Lithology and facies The Blue Lias comprises decimetre scale alternations of clay, argillaceous limestone and mudstone. These alternations are caused by short ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lias Group
The Lias Group or Lias is a lithostratigraphic unit (a sequence of rock strata) found in a large area of western Europe, including the British Isles, the North Sea, the Low Countries and the north of Germany. It consists of marine limestones, shales, marls and clays. ''Lias'' is a Middle English term for hard limestone, used in this specific sense by geologists since 1833. In the past, geologists used ''Lias'' not only for the sequence of rock layers, but also for the timespan during which they were formed. It was thus an alternative name for the Early Jurassic epoch of the geologic timescale. It is now more specifically known that the Lias is Rhaetian to Toarcian in age (over a period of 20 million years between ) and thus also includes a part of the Triassic. The use of the name "Lias" for a unit of time is therefore slowly disappearing. Subdivisions In southern England, the Lias Group is often divided into Lower, Middle and Upper subgroups. In Southern England the Lias i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
