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Antalo Limestone
The Antalo Limestone, also known as the Antalo Sequence, is a geological formation in Ethiopia. It is between 300 and 800 metres thick and comprises fossiliferous limestones and marls that were deposited in a reef. Marine microfossils have shown an age between 165 and 150 million years. Name and definition The Antalo Supersequence includes two main stratigraphic units: the Antalo Sequence and the Agula Group. The Antalo Sequence, or Antalo Limestone has been named after the town of Hintalo in Tigray, Ethiopia. The name of the formation was coined by geologist William Thomas Blanford, who accompanied the British Expedition to Abyssinia in 1868. At that time, Hintalo was a major town on the route of the invading British army. So far the nomenclature has not been proposed for recognition to the International Commission on Stratigraphy. Geographical extent The sedimentary succession is found in Ethiopia, in the Mekelle Outlier, in the Blue Nile gorge, in the Harrar Plateau and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Degua Tembien
Dogu'a Tembien (, "Upper Tembien", sometimes transliterated as Degua Tembien) is a woreda in Tigray Region, Ethiopia. It is named in part after the former province of Tembien. Nowadays, the mountainous district is part of the Southeastern Tigray Zone. The administrative centre of this woreda is Hagere Selam. History Dogu’a Tembien holds numerous prehistoric sites, which have been dated to the Middle Stone Age in Ayninbirkekin, or Pastoral Neolithic in Aregen and Menachek. Geography Topography and landscapes Major mountains :* Tsatsen, 2815 metres, a wide mesa between Hagere Selam and Inda Maryam Qorar () :* Ekli Imba, 2799 metres, summit of the Arebay massif in Arebay ''tabia'' or district () :* Imba Zuw’ala, 2710 metres, near Hagere Selam () :* Aregen, 2660 metres, in Aregen ''tabia'' () :* Dabba Selama, 2630 metres, in Haddinnet ''tabia'' () (not to be confused with the homonymous monastery) :* Imba Dogu’a, 2610 metres, in Mizane Birhan ''tabia'' () :* Imb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tigray Region
The Tigray Region, officially the Tigray National Regional State, is the northernmost regional state in Ethiopia. The Tigray Region is the homeland of the Tigrayan, Irob, and Kunama people. Its capital and largest city is Mekelle. Tigray is the fifth-largest by area, the fifth-most populous, and the fifth-most densely populated of the 11 regional states. Tigray's official language is Tigrinya, similar to that spoken in Eritrea just to the North. The estimated population as of 2019 is 5,443,000. The majority of the population (c. 80%) are farmers, contributing 46% to the regional gross domestic product (2009). The highlands have the highest population density, especially in eastern and central Tigray. The much less densely populated lowlands comprise 48% of Tigray's area. Like many parts of Africa, Tigray is far from a religious monolith. Despite the historical identification of Ethiopia with Orthodox Christianity, the presence of Islam in Ethiopia is as old as the religion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Transgression
A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, which results in flooding. Transgressions can be caused by the land sinking or by the ocean basins filling with water or decreasing in capacity. Transgressions and regressions may be caused by tectonic events such as orogenies, severe climate change such as ice ages or isostatic adjustments following removal of ice or sediment load. During the Cretaceous, seafloor spreading created a relatively shallow Atlantic basin at the expense of deeper Pacific basin. That reduced the world's ocean basin capacity and caused a rise in sea level worldwide. As a result of the sea level rise, the oceans transgressed completely across the central portion of North America and created the Western Interior Seaway from the Gulf of Mexico to the Arctic Ocean. The opposite of transgression is regression in which the sea level falls relative to the land and expo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upper Jurassic
The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 163.5 ± 1.0 to 145.0 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata.Owen 1987. In European lithostratigraphy, the name "Malm" indicates rocks of Late Jurassic age. In the past, ''Malm'' was also used to indicate the unit of geological time, but this usage is now discouraged to make a clear distinction between lithostratigraphic and geochronologic/chronostratigraphic units. Subdivisions The Late Jurassic is divided into three ages, which correspond with the three (faunal) stages of Upper Jurassic rock: Paleogeography During the Late Jurassic Epoch, Pangaea broke up into two supercontinents, Laurasia to the north, and Gondwana to the south. The result of this break-up was the spawning of the Atlantic Ocean. However, at this time, the Atlantic Ocean was relatively narrow. Life forms of the epoch This epoch is well known for many famous types of dinosaurs, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agula Shale
Agula is a town located in northern Ethiopia. Located in the Debubawi (Southern) Zone of the Tigray Region, it lies about 32 km northeast of Mekelle, just east of the Mekelle to Addis Ababa highway, and 25 km north of Qwiha. It has a latitude and longitude of with an elevation of 1,930 metres above sea level. It is one of three towns in Kilte Awulaelo woreda. Nearby is a stream and a pass (elevation 2,030 metres) which share the same name. Agula was an important station on the salt caravan route from Dallol west to Atsbi. History 16th Century Agula was visited by the Portuguese priest Francisco Álvares on 13 August 1520, who called it ''Anguguim''. He mentions in the town "a well-built church — upon very thick stone supports; very well hewn" which was dedicated to Saint Chirqos. The town is mentioned again in an inquiry conducted by Emperor Iyasu I in 1698, in which he proclaimed that tolls should no longer be collected there. The village was visited in 1868 by mem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agula Group
Agula is a town located in northern Ethiopia. Located in the Debubawi (Southern) Zone of the Tigray Region, it lies about 32 km northeast of Mekelle, just east of the Mekelle to Addis Ababa highway, and 25 km north of Qwiha. It has a latitude and longitude of with an elevation of 1,930 metres above sea level. It is one of three towns in Kilte Awulaelo woreda. Nearby is a stream and a pass (elevation 2,030 metres) which share the same name. Agula was an important station on the salt caravan route from Dallol west to Atsbi. History 16th Century Agula was visited by the Portuguese priest Francisco Álvares on 13 August 1520, who called it ''Anguguim''. He mentions in the town "a well-built church — upon very thick stone supports; very well hewn" which was dedicated to Saint Chirqos. The town is mentioned again in an inquiry conducted by Emperor Iyasu I in 1698, in which he proclaimed that tolls should no longer be collected there. The village was visited in 1868 by mem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dire Dawa
Dire Dawa ( am, ድሬዳዋ, om, Dirree Dhawaa, 3=Place of Remedy; so, Diridhaba, meaning "where Dir hit his spear into the ground" or "The true Dir", ar, ديري داوا,) is a city in eastern Ethiopia near the Oromia and Somali Region border and one of two chartered cities in Ethiopia (the other being Addis Ababa, the capital). Dire Dawa alongside present-day Sitti Zone were apart of the Dire Dawa autonomous region stipulated in the 1987 Ethiopian Constitution until 1993 when it was split by the federal government into a separately administered chartered city. This was due to the ongoing clashes between the OLF and IGLF and prevented any further escalation. It is divided administratively into two woredas, the city proper and the non-urban woreda of Gurgura. Dire Dawa lies in the eastern part of the nation, on the Dechatu River, at the foot of a ring of cliffs. The western outskirts of the city lie on the Gorro River, a tributary of the Dechatu River. It is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrar
Harar ( amh, ሐረር; Harari: ሀረር; om, Adare Biyyo; so, Herer; ar, هرر) known historically by the indigenous as Gey (Harari: ጌይ ''Gēy'', ) is a walled city in eastern Ethiopia. It is also known in Arabic as the City of Saints ( ar, مدينة الأَوْلِيَاء). Harar is the capital city of the Harari Region. The ancient city is located on a hilltop in the eastern part of the country and is about five hundred kilometers from the Ethiopian capital Addis Ababa at an elevation of . For centuries, Harar has been a major commercial center, linked by the trade routes with the rest of Ethiopia, the entire Horn of Africa, the Arabian Peninsula, Asia, and through its ports, the outside world. Harar Jugol, the old walled city, was listed as a World Heritage Site in 2006 by UNESCO in recognition of its cultural heritage. Because of Harar's long history of involvement during times of trade in the Arabian Peninsula, the Government of Ethiopia has made it a cri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Nile
The Blue Nile (; ) is a river originating at Lake Tana in Ethiopia. It travels for approximately through Ethiopia and Sudan. Along with the White Nile, it is one of the two major tributaries of the Nile and supplies about 85.6% of the water to the Nile during the rainy season. Course The distance of the river from its source to its confluence has been variously reported as being between and . This uncertainty might result from the fact that the river flows through a series of virtually impenetrable gorges cut in the Ethiopian Highlands to a depth of some . According to materials published by the Central Statistical Agency, the Blue Nile has a total length of , of which are inside Ethiopia. In Ethiopia The Blue Nile originates at Lake Tana in Ethiopia (where it is called the Abay River). The river flows generally south before entering a canyon about long, about from Lake Tana, which is a tremendous obstacle for travel and communication between north and south Ethiop ... [...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] |
British Expedition To Abyssinia
The British Expedition to Abyssinia was a rescue mission and punitive expedition carried out in 1868 by the armed forces of the British Empire against the Ethiopian Empire (also known at the time as Abyssinia). Emperor Tewodros II of Ethiopia, then often referred to by the anglicized name Theodore, imprisoned several missionaries and two representatives of the British government in an attempt to force the British government to comply with his requests for military assistance. The punitive expedition launched by the British in response required the transportation of a sizeable military force hundreds of kilometres across mountainous terrain lacking any road system. The formidable obstacles to the action were overcome by the commander of the expedition, General Robert Napier, who was victorious in every battle against the troops of Tewodros, captured the Ethiopian capital, and rescued all the hostages. The expedition was widely hailed on its return for achieving all its objectives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
