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A reef knoll is a landform that comprises an immense pile of calcareous material that had previously accumulated on an ancient sea floor. [1] Reef knolls are geological remnants of reefs and other organic concentrations of calcareous organisms.
Thunder Knoll is a reef knoll about 18 km in extent and composed of coral It lies approximately 6 km west of the north part of Rosalind Bank . Depths over this bank range from 11 to 27 m.
Chrome Hill / ˈ k r uː m / is a limestone reef knoll [1] in Derbyshire, England, in the upper Dove valley beside the border with Staffordshire, within the civil parish of Hartington Middle Quarter. It is adjacent to Parkhouse Hill, another reef knoll. The walk over Chrome Hill and Parkhouse Hill is known as the Dragon's Back ridge. [2]
The gorge sections of the Hamps and Manifold valleys incise the Ecton Limestone Formation and associated knoll-reefs to a point just downstream of their confluence. The Dove does similarly with the prominent tors and spires in the lower reaches of its gorge provided by knoll-reef limestones.
Geologically, the hill is the remains of an atoll (a 'reef knoll') which is believed to have existed during the Carboniferous period when what is now the Peak District was covered by a tropical sea. Together with its higher but less distinctive neighbour, Chrome Hill , it forms the Chrome and Parkhouse Hills SSSI , cited for their geology and ...
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Thorpe Cloud is an isolated limestone hill (a reef knoll) lying between the villages of Thorpe and Ilam on the Derbyshire/Staffordshire border at the southern end of Dovedale. It is a popular hill amongst the many day-trippers who visit the area, and provides a fine viewpoint north up the dale and south across the Midland plain.