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Geology Of Hertfordshire
The geology of Hertfordshire describes the rocks of the English county of Hertfordshire which are a northern part of the great shallow syncline known as the London Basin. The beds dip in a south-easterly direction towards the syncline's lowest point roughly under the River Thames. The most important formations are the Cretaceous chalks, which are exposed as the high ground in the north and west of the county, and the Cenozoic rocks made up of the Paleocene age Reading beds and Eocene age London Clay that occupies the remaining southern part.Hertfordshire Geological Society The Cretaceous On the northern boundary and just inside the county, at the foot of the chalk Chiltern Hills, near Tring and Ashwell, there is a small strip of exposed Cretaceous Gault Clay and Upper Greensand. At 100 million years old, these are the oldest rocks in the county. Rocks get progressively younger as one moves in a south easterly direction through the county. The lowest layer of the chalk is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Herts Dean 1864
Geology () is a branch of natural science concerned with Earth and other Astronomical object, astronomical objects, the features or rock (geology), rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth science, 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 dating, relative and Geochronology, 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 Eart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gault Clay
The Gault Formation is a geological formation of stiff blue clay deposited in a calm, fairly deep-water marine environment during the Lower Cretaceous Period (Upper and Middle Albian). It is well exposed in the coastal cliffs at Copt Point in Folkestone, Kent, England, where it overlays the Lower Greensand formation, and underlies the Upper Greensand Formation. These represent different facies, with the sandier parts probably being deposited close to the shore and the clay in quieter water further from the source of sediment; both are believed to be shallow-water deposits. The etymology of the name is uncertain and probably of local origin. Distribution It is found in exposure on the south side of the North Downs and the north side of the South Downs. It is also to be found beneath the scarp of the Berkshire Downs, in the Vale of White Horse, in Oxfordshire, England, and on the Isle of Wight where it is known as Blue Slipper. Gault underlies the chalk beneath the Londo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burnham Green, Hertfordshire
Burnham may refer to: Places Canada *Burnham, Saskatchewan England * Burnham, Buckinghamshire ** Burnham railway station ** Burnham Grammar School *Burnham Green, Hertfordshire, location of The White Horse * Burnham, Lincolnshire **High Burnham, Isle of Axholme, Lincolnshire **Low Burnham, Isle of Axholme, Lincolnshire * Norfolk Burnhams New Zealand * Burnham, New Zealand army base United States *Burnham, Illinois *Burnham, Maine *Burnham, Missouri *Burnham, Pennsylvania *Mount Burnham, a peak along the San Gabriel Mountains in California Other uses *Burnham (band), a Vermont-based Pop-Rock band *Burnham (crater), on the Moon *Burnham (surname) * Baron Burnham, a title in the Peerage of the United Kingdom *Burnham Institute for Medical Research, a nonprofit medical research institute * J.W. Burnham House, historic house in Louisiana, USA * Operation Burnham, a military action of the NZSAS in 2010. *Burnham F.C. Burnham F.C. is a non-League football club based in Burnham ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ayot Green
Ayot Green is a hamlet in Hertfordshire, England and is near the A1(M) Motorway, close to Welwyn Garden City. It is a typical traditional English village, centred on a village green. There are several other ''Ayots'' in the area, including Ayot St Lawrence and Ayot St Peter (where in 2011 The Census was included), and it also gives name to the rail trail called Ayot Greenway which stretches from Ayot Green to Wheathampstead Wheathampstead is a village and civil parish in Hertfordshire, England, north of St Albans. The population of the ward at the 2001 census was 6,058. Included within the parish is the small hamlet of Amwell. History Settlements in this area were .... References External links Hamlets in Hertfordshire Welwyn Hatfield {{Hertfordshire-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
St Albans
St Albans () is a cathedral city in Hertfordshire, England, east of Hemel Hempstead and west of Hatfield, north-west of London, south-west of Welwyn Garden City and south-east of Luton. St Albans was the first major town on the old Roman road of Watling Street for travellers heading north and became the city of Verulamium. It is within the London commuter belt and the Greater London Built-up Area. Name St Albans takes its name from the first British saint, Alban. The most elaborate version of his story, Bede's '' Ecclesiastical History of the English People'', relates that he lived in Verulamium, sometime during the 3rd or 4th century, when Christians were suffering persecution. Alban met a Christian priest fleeing from his persecutors and sheltered him in his house, where he became so impressed with the priest's piety that he converted to Christianity. When the authorities searched Alban's house, he put on the priest's cloak and presented himself in place of his gu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hertfordshire Puddingstone
Hertfordshire puddingstone is a conglomerate sedimentary rock composed of rounded flint pebbles cemented together by a younger matrix of silica quartz. The distinctive rock is largely confined to the English counties of Buckinghamshire and Hertfordshire but small amounts occur throughout the London Basin. It is quite commonly found in fields in and around Chesham, where pieces can be seen as boundary stones and in rockeries. Despite a superficial similarity to concrete, it is an entirely natural silcrete. A fracture runs across both the pebbles and the sandy matrix as both have equal strength unlike concrete where the pebbles remain whole and a fracture occurs only in the matrix. Like other puddingstones, it derives its name from the manner in which the embedded flints resemble the plums in a pudding. It forms the local base of the Upnor Formation of the Lambeth Group (lower Eocene, 56-55 million years ago). Geological origin The flints were eroded from the surrounding cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene
The Paleogene ( ; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago ( Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The earlier term Tertiary Period was used to define the span of time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognised as a formal stratigraphic term, 'Tertiary' is still widely found in earth science literature and remains in informal use. Paleogene is often abbreviated "Pg" (but the United States Geological Survey uses the abbreviation PE for the Paleogene on the Survey's geologic maps). During the Paleogene, mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baldock
Baldock ( ) is a historic market town and unparished area in the local government district of North Hertfordshire in the county of Hertfordshire, England, where the River Ivel rises. It lies north of London, southeast of Bedford, and north northwest of the county town of Hertford. Nearby towns include Royston to the northeast, Letchworth and Hitchin to the southwest and Stevenage to the south. History and etymology Baldock has an exceptionally rich archaeological heritage.Moorhead, Sam. "A survey of Roman coin finds from Hertfordshire", in Lockyear, Kris (2015)''Archaeology in Hertfordshire: Recent Research'' University of Hertfordshire Press. Paleolithic, Neolithic and Bronze Age settlements show the site of Baldock has been continuously occupied since prehistoric times.Mawer, J. E. B., Stenton, Allen and Gover, F. M. (1938) ''The Place-Names Of Hertfordshire'' (English Place-Name Society Volume XV), Cambridge University Press, ASIN: B0019T1T10 iArchaeology Data Service ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apsley, Hertfordshire
Apsley was a 19th-century mill village in the county of Hertfordshire, England. It is a historic industrial site situated in a valley of the Chiltern Hills. It is positioned below the confluence of two permanent rivers, the Gade and Bulbourne. In an area of little surface water this was an obvious site for the location of water mills serving local agriculture and from the early 19th century became an important centre for papermaking. Today it is a suburb of the larger town of Hemel Hempstead. Recent (2011–) rapid building around the canal area has seen a large influx of London commuters, largely from the software and business communities. At the 2011 Census the village was included in the Dacorum Ward of Apsley and Corner Hall. Origin of the name The name Apsley dates from the Anglo-Saxon period and means ''aspen wood''. History 1798-1999 It was the construction of the trunk canal (later to be called the Grand Union Canal) between London and the Midlands through the v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boxmoor
Boxmoor is part of Hemel Hempstead in Hertfordshire. It is within the district of Dacorum and comprises mainly 19th-century housing and meadowland, with transport links from London to the Midlands. At the 2011 Census, the population of Boxmoor was included in the Dacorum ward of Bovingdon, Flaunden and Chipperfield. History The name Boxmoor derives from the box tree, a bushy inhabitant of the chalky hills that surround the location. This is linked together with the word 'mor', which signifies a marshy spot; Boxmoor's ancient watermeadows are still a major feature of the locality. A mesolithic camp site was discovered in 1975 on the site of what is now Boxmoor trout fishery, close to Fisheries wharf. Finds include 'pot boiler' stones, bones of the wild ox, Bos Primigenius and a hand-crafted grinding quern made of the hard local rock known as Hertfordshire puddingstone. All were dated to around 1500 BCE. An even older stone axe head dated to 6000 BCE was also discovered. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dunstable Downs
Dunstable Downs are part of the Chiltern Hills, in southern Bedfordshire in England, located near (and named after) the town of Dunstable. They are a chalk escarpment forming the north-eastern reaches of the Chilterns. At , Dunstable Downs are the highest point in the county of Bedfordshire. Because of its elevation, Dunstable Downs hosted a station in the shutter telegraph chain which connected the Admiralty in London to its naval ships in the port of Great Yarmouth during the years 1808 to 1814. Whipsnade Zoo has cut an enormous lion shape into the chalk on the side of one of the hills. The lion can be seen from the B489 (Aylesbury to Dunstable road). The downs are used by gliders, kite fliers, hang gliders and paragliders in the area because of their height. The London Gliding Club is based at the foot of the downs. Much of the downs is managed by the National Trust as part of the Dunstable Downs & Whipsnade Estate property. Ascents Central Bedfordshire Council and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivinghoe
Ivinghoe is a village and civil parish in east Buckinghamshire, England, close to the border with Hertfordshire and Bedfordshire. It is northwest of London, north of Tring and south of Leighton Buzzard, close to the village of Pitstone. Etymology The village name is Anglo-Saxon in origin, and means 'Ifa's hill-spur'. The same name is found in Ivington (He) and its strong form in Iveston and Ivesley (Du). The term "hoh" ('projecting ridge of land, a promontory' similar to german Höhe) refers probably to Ivinghoe Beacon. Allen Mawer notes that Ivinghoe is located "at the base of a considerable spur of land jutting out from the main range of the Chilterns". Domesday Book of 1086 it was recorded as ''Evinghehou''. Other forms: Iuingeho, Hythingho, Yvyngho (xii–xiii cent.); Ivanhoe (xvii cent.) Ivinghoe and Ivanhoe Ivanhoe is an alternative form of Ivinghoe. It is the inspiration for the title of Walter Scott's most famous novel. Ivanhoe is the feudal title of Wilfred of Ivan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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