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Nottingham, Deerfield, Rockingham County, New Hampshire, United States. Coordinates. 43°6′7″N71°10′52″W43.10194°N 71.18111°W. Area. 22.22 km 2 (8.58 sq mi) Website. Pawtuckaway State Park. Pawtuckaway State Park is a 5,000-acre (20 km 2) preserve in New Hampshire, United States. It is one of the largest state parks in southeastern ...
Ring dike. A ring dike or ring dyke is an intrusive igneous body that is circular, oval or arcuate in plan and has steep contacts. [1] While the widths of ring dikes differ, they can be up to several thousand meters. [2] The most commonly accepted method of ring dike formation is directly related to collapse calderas.
Coordinates: 43°44′37″N 71°16′26″W. The Ossipee Mountains, as seen from the south across Lake Winnipesaukee from the Belknap Mountains. The Ossipee Mountains are a small mountain range in the New England state of New Hampshire, United States. The remains of an ancient volcanic ring dike, [1] they lie north of Lake Winnipesaukee, east ...
Mount Shaw is a mountain located in the towns of Moultonborough and Tuftonboro in Carroll County, New Hampshire, United States. It is part of the remains of an ancient volcanic ring dike. [2] With a summit elevation of 2,990 feet (911 m), it is the highest of the Ossipee Mountains. The Ossipee ring-dike complex of central New Hampshire is a ...
Pages in category "Ring dikes". The following 25 pages are in this category, out of 25 total. This list may not reflect recent changes.
Pilanesberg. The Pilanesberg (formerly Pilandsberg[2][3]) is a mountain in the North West Province, South Africa. The mountain is an ancient volcanic structure, circular in shape, that rises from flat surrounding plains. It is formed by three concentric ridges or rings of hills, of which the outermost has a diameter of about 24 km.
The inner ring dike is about 30 metres (98 ft) in width, 3 kilometres (1.9 mi) from the center of the Richat Structure. The outer ring dike is about 70 metres (230 ft) in width, 8 kilometres (5.0 mi) from the center of the structure. [6] Thirty-two carbonatite dikes and sills have been mapped within the structure. The dikes are generally about ...
The dike was intruded into Protozoic metamorphic rock, primarily amphibolite and metasandstone, approximately 1.7 billion years ago. Erosion and removal of younger, overlying rock and the adjacent Proterozoic metamorphic rock has exposed the dike, which is composed of tonalite, granodiorite, and granite. The quarry was within a map unit of ...
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