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The tablet measures 24.1 by 20.1 cm and seems to be made from locally sourced vesicular basalt. [ 5 ] [ 1 ] The carving was made with a conical drill and then smoothed.
The Giant's Causeway (Irish: Clochán an Aifir) [1] is an area of approximately 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption. [3] [4] It is located in County Antrim on the north coast of Northern Ireland, about three miles (4.8 km) northeast of the town of Bushmills.
Basalt (UK: / ˈ b æ s ɒ l t,-ɔː l t,-əl t /; [1] [2] US: / b ə ˈ s ɔː l t, ˈ b eɪ s ɔː l t /) [3] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon.
Portal stones are a pair of Megalithic orthostats, usually flanking the entrance to a chamber tomb or opposite the axial stone of an axial stone circle. They are commonly found in dolmens. Examples may be seen at Bohonagh and Knocknakilla. A trilithon at Stonehenge
Mount Taylor volcano was the leading source of volcanism in this area for this time period, aside from some local basalt eruptions. [11] The trend of Mount Taylor eruptions can be divided into four sequences or phases. [19] The first phase, from 3.74 to 2.93 million years ago, was mostly basanite with some alkali basalt which formed mesa caps.
A flood basalt (or plateau basalt [1]) is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ocean floor with basalt lava. Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the Earth via a mantle plume . [ 2 ]
The vertically-jointed basalt columns are in polygonal form as rectangular, pentagonal and hexagonal prisms, and are 30–40 m (98–131 ft) high. [1] It covers an area of 10.249 ha (25.33 acres). [2] The formation, structure, and the outlook of the basalt rocks are rare examples in the world. It was declared a protected area of first grade on ...
A major use for basalt is crushed rock for road and housing construction in concrete, macadam, and paving stones. Because of its insensitivity to chemical influences, resistance to mechanical stress, high dry relative density, frost resistance, and seawater resistance, trap rock is used as ballast for railroad track bed and hydraulic ...