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  2. Geology of Tasmania - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Tasmania

    Even the Tasmanian islands in the far north of Bass Strait are composed of granite, including Rodondo Island, Moncoeur Island, Kent Group including Deal Island, and Judgement Rocks. [6] Hogan Island and Curtis Island. These islands formed a land bridge in the last ice age and butt up against Wilsons Promontory in Victoria.

  3. Geology of Ireland - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Ireland

    Much of the northeast of Ireland is a basalt plateau. An area of particular note is the Giant's Causeway on the north coast, a mainly basalt formation caused by volcanic activity between 50 and 60 million years ago. [21] The basalts were originally part of the great Thulean Plateau formed during the Paleogene period. [22]

  4. Ocean island basalt - Wikipedia

    en.wikipedia.org/wiki/Ocean_island_basalt

    However, some ocean island basalt locations coincide with plate boundaries like Iceland, which sits on top of a mid-ocean ridge, and Samoa, which is located near a subduction zone. [ 2 ] In the ocean basins, ocean island basalts form seamounts , [ 3 ] and in some cases, enough material is erupted that the rock protrudes from the ocean and forms ...

  5. Hawaiite - Wikipedia

    en.wikipedia.org/wiki/Hawaiite

    Hawaiite is an olivine basalt with a composition between alkali basalt and mugearite. [1] It was first used as a name for some lavas found on the island of Hawaii.. It occurs during the later stages of volcanic activity on oceanic islands such as Hawaii, [2] which happens to be when the alkali metals are most present.

  6. Geology of the Faroe Islands - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Faroe_Islands

    The island Lítla Dímun in the Faroes. The Faroe Islands lie on the Eurasian Plate between Scotland, Norway and Iceland. The islands are of volcanic origin and are made up of three layers of basalt, with the top and bottom layers resembling each other. The age of this rock is between 54 and 58 million years, with the oldest material at the ...

  7. Geology of the Yosemite area - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Yosemite_area

    The sediment that formed the area first settled in the waters of a shallow sea, and compressive forces from a subduction zone in the mid-Paleozoic fused the seabed rocks and sediments, appending them to the continent. Heat generated from the subduction created island arcs of volcanoes that were also thrust

  8. Hamada - Wikipedia

    en.wikipedia.org/wiki/Hamada

    Hamada desert near the Hoggar Mountains in Algeria. Cyclists ride over Hamada to the Erg Chebbi dunes, Morocco . A hamada ( Arabic : حمادة , ḥammāda ) is a type of desert landscape consisting of high, largely barren, hard rocky ( basalt ) plateaus, where most of the sand has been removed by deflation . [ 1 ]

  9. Geology of Guam - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Guam

    The geology of Guam formed as a result of mafic, felsic and intermediate composition volcanic rocks erupting below the ocean, building up the base of the island in the Eocene, between 33.9 and 56 million years ago. The island emerged above the water in the Eocene, although the volcanic crater collapsed.