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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. 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 ...
A hard rock type such as granite is resistant to erosion and creates a promontory whilst a softer rock type such as the clays of Bagshot Beds is easily eroded creating a bay. Part of the Dorset coastline running north from the Portland limestone of Durlston Head is a clear example of a discordant coastline.
The Pinnacles lie directly east of Studland, approximately 200 metres south of Old Harry Rocks and about 4 kilometres northeast of Swanage. The chalk headlands of the Ballard Downs are owned by the National Trust. The rocks can be viewed from the Dorset section of the South West Coastal Path.
Old Harry, a hamlet in Grosse-Île, Quebec, Canada; Old Harry, pen name for Australian journalist Carl Feilberg (1844–1887) Old Harry oil field, in the Gulf of St. Lawrence, Newfoundland, Canada; Old Harry Rocks, chalk formation at Handfast Point, Dorset, England
[1] [2] The ridge is formed by the structure known as the Purbeck Monocline, and extends from Lulworth Cove in the west to Old Harry Rocks in the east, where it meets the sea. The hills are part of a system of chalk downlands in southern England formed from the Chalk Group which also includes Salisbury Plain and the South Downs .
Ballard Down is an area of chalk downland on the Purbeck Hills in the English county of Dorset.The hills meet the English Channel here, and Ballard Down forms a headland, Ballard Point, between Studland Bay to the north and Swanage Bay to the south.
The headland at High Down was used for Black Knight [7] and Black Arrow [8] rocket engine tests from 1956 to 1971. During the peak of activity in the early 1960s some 240 people worked at the complex, while the rockets were built in nearby East Cowes. These rockets were later used to launch the Prospero X-3 satellite.
Natural erosion has formed stacks along and at the end of the northern headland, in particular the notable Old Harry Rocks. In part through the process of quarrying, fossils from the dinosaur age have been discovered in the local rock, and the coastline up to and including Swanage Bay has been included in the Jurassic Coast World Heritage Site .