One legend says that the Devil (traditionally known euphemistically as "Old Harry") slept on the rocks. There are various stories about the naming of the rocks. The National Trust, who own the stacks in perpetuity, have experience in looking after the coast, and have found that "working with natural processes is the most sustainable approach". Some people desire to preserve the rocks and protect them from the erosive processes that formed Old Harry. Old Harry is formed by erosion processes, which will eventually remove the stack, whilst new stacks develop. The arch subsequently collapsed to leave the stacks of Old Harry and his wife, No Man's Land (the large outcrop of rock at the end of the cliffs) and the gap of St Lucas' Leap. This eventually eroded right through to create an arch. To form the stacks, the sea gradually eroded along the joints and bedding planes where the softer chalk meets harder bedrock of the rock formations to create a cave. These are also part of the same chalk band and only a few thousand years ago were connected to Ballard Down. Across the water to the east The Needles on the Isle of Wight are usually visible. The bands of stone have been gradually eroded over the centuries, some of the earlier stacks having fallen (Old Harry's original wife fell in 1509), while new ones have been formed by the breaching of narrow isthmuses. The downlands of Ballard Down are part of the of Portsdown Chalk Formation, containing some bands of flint, and were formed 72-84 million years ago in the Campanian age of the Late Cretaceous. Hydraulic action is the main cause of erosion (sheer force of the wave) that damaged the rock and caused it to fall away. Old Harry's Wife was another stack which was eroded through corrosion and abrasion, until the bottom was so weak the top fell away, leaving a stump. One of these stacks is known as Old Harry.
The tops of the arches collapsed after being weakened by rainfall and wind, leaving disconnected stacks. As the headland suffered hydraulic action (a process in which air and water are forced into small cracks by the force of the sea, resulting in enlarging cracks), first caves, then arches formed. The chalk of Old Harry Rocks used to be part of a long stretch of chalk between Purbeck and the Isle of Wight, but remained as a headland after large parts of this seam were eroded away. The rocks can be viewed from the Dorset section of the South West Coast Path. To the south are the chalk cliffs of Ballard Down, much of which is owned by the National Trust. Old Harry Rocks lies directly east of Studland, about 1.5 miles (2.4 km) northeast of Swanage, and about 3 miles (4.8 km) south of the large towns of Poole and Bournemouth. They mark the most eastern point of the Jurassic Coast, a UNESCO World Heritage Site. Old Harry Rocks are three chalk formations, including a stack and a stump, located at Handfast Point, on the Isle of Purbeck in Dorset, southern England.
0 kommentar(er)
