A glacial period (alternatively glacial or glaciation ) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials , on the other hand, are periods of warmer climate between glacial periods. The Last Glacial Period ended about 15,000 years ago. The Holocene is the current interglacial. A time with no glaciers on Earth is considered a greenhouse climate state .
11-1582: This article is about the given name. For the valley, see Cwm Idwal . For the lake in the valley, see Llyn Idwal . Idwal is Welsh for "lord of the wall". As a masculine given name, it may refer to the following people: Middle Ages [ edit ] Ordered chronologically Idwal Iwrch (reigned c. 655–682), King of Gwynedd Idwal or Ithel ap Morgan , 8th century King of Gwent and Glywysing Idwal Foel (died c. 942), King of Gwynedd Idwal ab Idwal, better known as Ieuaf (ruled 950–969), joint king of Gwynedd (with his father Idwal Foel) and possibly Powys Idwal ap Meurig (died 997), King of Gwynedd Modern world [ edit ] Ordered alphabetically Idwal Davies (footballer) (1899–1980), Welsh footballer Idwal Davies (rugby) (1915–1990), Welsh dual-code rugby player Idwal H. Edwards (1895–1981), United States Air Force lieutenant general Idwal Fisher (1935–2012), Welsh rugby union and rugby league footballer Idwal Jones (writer) (1887–1964), novelist and non-fiction writer Idwal Jones (novelist) (1887–1964), Welsh-American novelist and non-fiction writer Idwal Jones (politician) (1900–1982), Welsh politician Idwal Jones (writer) (1895–1937), Welsh schoolmaster, poet and dramatist Idwal Pugh (1918–2010), Welsh civil servant Idwal Rees (1910–1991), Welsh international rugby union centre Idwal Robling (1927–2011), Welsh sports commentator [REDACTED] Name list This page or section lists people that share
22-458: A 2005 poll conducted by Radio Times , Cwm Idwal was ranked the 7th greatest natural wonder in Britain. Cwm Idwal is a spectacular product of glaciation , surrounded by high crags, screes , moraines and rounded rocks, with a lake on its floor ( Llyn Idwal ). Cwm Idwal comprises volcanic and sedimentary rock which was laid down in a shallow Ordovician sea, and later folded to give rise to
33-551: Is also a home of the Snowdon lily , a plant which can only be found in the UK on Snowdon and its surroundings. Evan Roberts , the renowned botanist and explorer from Capel Curig , did probably as much as any other (self-taught) botanist to document the area. The Snowdonia hawkweed, Hieracium snowdoniense is only known to occur in Cwm Idwal. Rhiwiau Caws (Idwal Slabs) and the cliffs around
44-541: Is different from Wikidata All set index articles Cwm Idwal Cwm Idwal is a cirque (or corrie) in the Glyderau range of mountains in northern Snowdonia , the national park in the mountainous region of North Wales . Its main interest is to hill walkers and rock climbers , but it is also of interest to geologists and naturalists, given its combination of altitude (relatively high in UK terms), aspect (north-facing) and terrain (mountainous and rocky). In
55-711: The Tian Shan ) Jomolungma (in the Himalayas ), and Llanquihue (in Chile ). The glacial advance reached the Last Glacial Maximum about 26,500 BP . In Europe , the ice sheet reached Northern Germany . Over the last 650,000 years, there have been on average seven cycles of glacial advance and retreat. Since orbital variations are predictable, computer models that relate orbital variations to climate can predict future climate possibilities. Work by Berger and Loutre suggests that
66-587: The distinctive trough-shaped arrangement of strata known today as the Idwal Syncline . This fold in the rock is visible today, thanks to the layering of the sedimentary rocks. The area was then eroded by glacial action to form the classic semicircular valley. Given its elevation and north-facing aspect, Cwm Idwal is the most southerly place in Britain where Arctic plants such as moss campion and some alpine saxifrages , such as tufted saxifrage ( Saxifraga cespitosa ) and Micranthes nivalis , can be found. It
77-888: The glacial period covered many areas of the Northern Hemisphere and have different names, depending on their geographic distributions: Wisconsin (in North America ), Devensian (in Great Britain ), Midlandian (in Ireland ), Würm (in the Alps ), Weichsel (in northern Central Europe ), Dali (in East China ), Beiye (in North China ), Taibai (in Shaanxi ) Luoji Shan (in southwest Sichuan ), Zagunao (in northwest Sichuan ), Tianchi (in
88-511: The head of Cwm Idwal are a popular area for rock climbing; Rhiwiau Caws (on the eastern side of the Cwm) in particular are popular with inexperienced climbers learning their skills. They were first climbed in 1897 by Rose and Moss. Twll Du has some excellent ice climbing during the winter. The Cwm is also popular for hill walking and scrambling , given its proximity to Tryfan and Glyder Fach and Glyder Fawr and their profusion of rocky ridges. In
99-700: The last 740,000 years alone. The Penultimate Glacial Period (PGP) is the glacial period that occurred before the Last Glacial Period . It began about 194,000 years ago and ended 135,000 years ago, with the beginning of the Eemian interglacial. The last glacial period was the most recent glacial period within the Quaternary glaciation at the end of the Pleistocene , and began about 110,000 years ago and ended about 11,700 years ago. The glaciations that occurred during
110-448: The mid-to-late 1950s and into the 1960s, this was the reunion excursion campsite of the first ascenders of Mount Everest and Kangchenjunga , held at Pen-y-Gwryd , many of whom were keen geologists and botanists . [REDACTED] Glaciation Within the Quaternary , which started about 2.6 million years before present , there have been a number of glacials and interglacials. At least eight glacial cycles have occurred in
121-409: The same given name . If an internal link led you here, you may wish to change that link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Idwal&oldid=1168752394 " Categories : Given names Welsh masculine given names Welsh given names Hidden categories: Articles with short description Short description
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