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Complete Scream Cliff
Fair Head or Benmore ( ga, An Bhinn Mhór; The Great Cliff) is a long, high, mountain cliff, close to the sea, at the north-eastern corner of County Antrim, Northern Ireland. The cliff's sheer and vertical high dolerite rock face is shaped into distinctive vertical columns like organ pipes, which formed 60 million years ago when a Sill (geology), sill of igneous rock was injected between horizontal Carboniferous sediments. Fair Head is considered one of the best traditional climbing and bouldering locations in the British Isles, and is one of the biggest expanses of climbable rock in Northwest Europe. It has one of the largest concentration of extreme-graded routes in the British Isles, and has climbs at Grade (climbing)#British, E9-grade (e.g. ''Rathin Effect''), as well as Bouldering#Highball bouldering, highball problems at Grade (climbing)#British, E9-grade (e.g. ''Long runs the Fox''), and bouldering at grade (e.g. ''Blondie SDS''). Geography The headland of Fair Head ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diabase
Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). ''Diabase'' is the preferred name in North America, while ''dolerite'' is the preferred name in the rest of the English-speaking world, where sometimes the name ''diabase'' refers to altered dolerites and basalts. Some geologists prefer to avoid confusion by using the name ''microgabbro''. The name ''diabase'' comes from the French ', and ultimately from the Greek - meaning "act of crossing over, transition". Petrography Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set in a finer matrix of clinopyroxene, typically augite (20–29%), with minor olivine (3% up to 12% in olivine diabase), magnetite (2%), an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
