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Geology Of Ireland
The geology of Ireland consists of the study of the rock formations on the island of Ireland. It includes rocks from every age from Proterozoic to Holocene and a large variety of different rock types is represented. The basalt columns of the Giant's Causeway together with geologically significant sections of the adjacent coast have been declared a World Heritage Site. The geological detail follows the major events in Ireland's past based on the geological timescale. Timeline The oldest known Irish rock is about 1.7 billion years old and is found on Inishtrahull Island off the north coast of Ulster. Outcrops at Annagh Head on the Mullet Peninsula are almost as old. In other parts of Donegal, scientists have discovered rocks that originated as glacial deposits, demonstrating that at this early period, part of what was to become Ireland was in the grip of an ice age. However, because of the effects of later upheavals, it is almost impossible to sequence these early rock layers corre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Map Of Ireland Whittow
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precambrian
The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian accounts for 88% of the Earth's geologic time. The Precambrian is an informal unit of geologic time, subdivided into three eons ( Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of Earth about 4.6 billion years ago ( Ga) to the beginning of the Cambrian Period, about million years ago ( Ma), when hard-shelled creatures first appeared in abundance. Overview Relatively little is known about the Precambrian, despite it making up roughly seven-eighths of the Earth's history, and what is known has largely been discovered from the 1960s onwards. The Precambrian fossil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donegal Batholith
The Donegal batholith is a large granitic igneous intrusion of early Devonian age that outcrops in County Donegal in Ireland. It consists of at least eight separate plutons, the largest of which is the Main Donegal Granite. It was intruded at a late stage in the Caledonian orogeny about 400 million years ago (Ma). Extent and geometry The Donegal batholith extends for about 75 km in a SW-NE direction from just west of the small town of Ardara to Fanad Head. The NW-SE extent is more difficult to determine as much of the Thorr and Fanad plutons lie offshore. Formation The Donegal batholith was formed during the Early Devonian, towards the end of the Caledonian orogeny between about 418 and 397 Ma. It is interpreted to have been intruded along a major SW-NE trending sinistral shear zone. The space to allow the intrusion of such large volumes of granitic magma into the crust is thought to be a result of movement along the shear zone combined with the sinistral strike-slip reactivation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite
Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or ''granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. Granite is nearly alway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fauna
Fauna is all of the animal life present in a particular region or time. The corresponding term for plants is ''flora'', and for fungi, it is '' funga''. Flora, fauna, funga and other forms of life are collectively referred to as '' biota''. Zoologists and paleontologists use ''fauna'' to refer to a typical collection of animals found in a specific time or place, e.g. the "Sonoran Desert fauna" or the "Burgess Shale fauna". Paleontologists sometimes refer to a sequence of faunal stages, which is a series of rocks all containing similar fossils. The study of animals of a particular region is called faunistics. Etymology ''Fauna'' comes from the name Fauna, a Roman goddess of earth and fertility, the Roman god Faunus, and the related forest spirits called Fauns. All three words are cognates of the name of the Greek god Pan, and ''panis'' is the Greek equivalent of fauna. ''Fauna'' is also the word for a book that catalogues the animals in such a manner. The term was first used b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
County Louth
County Louth ( ; ga, An Lú) is a coastal county in the Eastern and Midland Region of Ireland, within the province of Leinster. Louth is bordered by the counties of Meath to the south, Monaghan to the west, Armagh to the north and Down to the north-east, across Carlingford Lough. It is the smallest county in Ireland by land area and the 17th most populous, with just over 139,100 residents as of 2022. The county is named after the village of Louth. Louth County Council is the local authority for the county. History County Louth is named after the village of Louth, which in turn is named after Lugh, a god of the ancient Irish. Historically, the placename has had various spellings; , , and (see Historic Names List, for full listing). is the modern simplified spelling. The county is steeped in myth, legend and history, and is a setting in the epic. Later it saw the influence of the Vikings, as seen in the name of Carlingford Lough. They also established a longphort a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clogherhead
Clogherhead () is a fishing village in County Louth, Ireland. Located in a natural bay on the east coast it is bordered by the villages of Annagassan to the north and Termonfeckin to the south. It has a population of 2,145 according to the 2016 census. It is located in the townlands of Clogher and Callystown, about northeast of Drogheda. As a seaside village, its main industries are fishing and farming, and there has been an RNLI lifeboat stationed in the village for over 100 years. Name Historically, the village was known simply as Clogher (''Clochair'') or Killclogher (''Cill Chlochair'') while the headland was called Clogher Head. Today the headland remains Clogher Head, the village is called Clogherhead and the townland they are in is called Clogher. The headland has a walking trail from the village along steep sea cliffs to the nearby harbour of Port Oriel (''Port Oirialla''). At low tide, it is also possible to walk the beach as far as the Boyne Estuary. From the head ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leinster
Leinster ( ; ga, Laighin or ) is one of the provinces of Ireland, situated in the southeast and east of Ireland. The province comprises the ancient Kingdoms of Meath, Leinster and Osraige. Following the 12th-century Norman invasion of Ireland The Anglo-Norman invasion of Ireland took place during the late 12th century, when Anglo-Normans gradually conquered and acquired large swathes of land from the Irish, over which the kings of England then claimed sovereignty, all allegedly sanc ..., the historic provinces of Ireland, "fifths" of Leinster and Meath gradually merged, mainly due to the impact of the Pale, which straddled both, thereby forming the present-day province of Leinster. The ancient kingdoms were shired into a number of counties of Ireland#2.1 Pre-Norman sub-divisions, counties for administrative and judicial purposes. In later centuries, local government legislation has prompted further sub-division of the historic counties. Leinster has no official funct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bray Head
Bray Head ( ga, Ceann Bhré) is a hill and headland located in northern County Wicklow, Ireland, between the towns of Bray and Greystones. It forms part of the Wicklow Mountains and is a popular spot with hillwalkers. At the top of the head is a concrete cross which was placed there in 1950 during the holy year. Every Good Friday, hundreds of local people climb to the top of the head in a Good Friday procession marking the stations of the Cross as they go along, with the final station being held at the holy year cross. The headland and adjacent lands were designated under a Special Amenity Area Order in March 2008. The most direct way to reach the cross at the top (about 190m above sea level) is via an ascending footpath that begins just outside the free car park on the lower, northern slopes, to the south of Bray Esplanade. This is a half-hour walk for a fit person. The footpath, after the initial section with cut steps, is a rough path formed by rainwater and ascending throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oldhamia
''Oldhamia'' is an ichnogenus describing burrows produced by worm-like organisms mining underneath microbial mats. It was common from the Early Cambrian deep-water deposits. The Ediacaran species ''Oldhamia recta'' are body fossils of a rod-like organism, rather than ichnofossils. The Ordovician ''Oldhamia pinnata'' and Carboniferous-Permian ''Oldhamia fimbriata'' were mentioned without any ichnotaxonomical formalization, and therefore are ''nomina nuda''. It was named after the geologist Thomas Oldham. See also *List of Ediacaran genera This is a list of all described Ediacaran genera, including the Ediacaran biota. It contains 227 genera. References {{reflist, 30em * Ediacaran The Ediacaran Period ( ) is a geological period that spans 96 million years from the end o ... References Burrow fossils Fortunian {{cambrian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latitude
In geography, latitude is a coordinate that specifies the north– south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from –90° at the south pole to 90° at the north pole, with 0° at the Equator. Lines of constant latitude, or ''parallels'', run east–west as circles parallel to the equator. Latitude and ''longitude'' are used together as a coordinate pair to specify a location on the surface of the Earth. On its own, the term "latitude" normally refers to the ''geodetic latitude'' as defined below. Briefly, the geodetic latitude of a point is the angle formed between the vector perpendicular (or ''normal'') to the ellipsoidal surface from the point, and the plane of the equator. Background Two levels of abstraction are employed in the definitions of latitude and longitude. In the first step the physical surface is modeled by the geoid, a surface which approximates the mean sea level over the ocean ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
