reef knoll is a landform that comprises an immense pile of calcareous material that had previously accumulated on an ancient sea floor. Reef knolls are...

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...

Thunder Knoll 16°27′N 80°20′W / 16.450°N 80.333°W / 16.450; -80.333 is a reef knoll about 18 km in extent and composed of coral sand. It lies approximately...

319 km2, 123 sq mi total lagoon size). The geological formation known as a reef knoll refers to the elevated remains of an ancient atoll within a limestone...

Chrome Hill /ˈkruːm/ is a limestone reef knoll in Derbyshire, England, in the upper Dove valley beside the border with Staffordshire, within the civil...

stands Thorpe Cloud, 942 ft (287 m), an isolated limestone hill known as a reef knoll. It provides a viewpoint north up the dale and south across the Midlands...

surrounded by reef knolls, especially Elbolton Hill to the west, and Kail Hill to the east. All of these form part of the Cracoe Reef Knolls SSSI. This seclusion...

Staffordshire. Geologically, the hill is the remains of an atoll (a 'reef knoll') which is believed to have existed during the Carboniferous period when...

Elbolton Cave excavations, the Craven Herbarium and Richard Tiddeman's reef knoll collection. It was opened by Sir Henry Alexander Miers, president of the...

The plateau was once on the shoreline, supported by the presence of reef knolls inside its limestone outcroppings. Over time, heavy erosion, tectonic...