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  2. North Table Mountain Ecological Reserve - Wikipedia

    en.wikipedia.org/wiki/North_Table_Mountain...

    The Northern Basalt Flow Vernal Pools habitat is found in only four localities within the state. Time and erosion have split the volcanic plateau of Table Mountain into two sections, north and south. There are smaller ravines as well that support various types of trees and woodlands.

  3. Polvadera Group - Wikipedia

    en.wikipedia.org/wiki/Polvadera_Group

    The Polvadera Group is a sequence of basalt, andesite, dacite, and rhyolite flows that underlie part of the central and most of the northern Jemez Mountains. It overlaps the Keres Group to the south and has a maximum thickness of about 1,100 meters (3,600 feet).

  4. List of places with columnar jointed volcanics - Wikipedia

    en.wikipedia.org/wiki/List_of_places_with...

    Basalt columns seen on Porto Santo Island, Portugal. Columnar jointing of volcanic rocks exists in many places on Earth. Perhaps the most famous basalt lava flow in the world is the Giant's Causeway in Northern Ireland, in which the vertical joints form polygonal columns and give the impression of having been artificially constructed.

  5. Table Mountain (Butte County, California) - Wikipedia

    en.wikipedia.org/wiki/Table_Mountain_(Butte...

    North Table Mountain and South Table Mountain are capped by the eroded remnants of a Miocene lava flow. [1] The dense, black basalt that caps North Table Mountain and South Table Mountain was initially called the Older Basalt. [2] Later it was renamed the Lovejoy Formation.

  6. Table Mountain (Tuolumne County, California) - Wikipedia

    en.wikipedia.org/wiki/Table_Mountain_(Tuolumne...

    It is just over 1,100 ft (340 m) in elevation at its southern end and just over 2,000 ft (610 m) in elevation at its northern end. Its flat top is part of a stack of multiple 80 mi (130 km)-long lava flows that have been eroded to form a series of mesas that extend from Knights Ferry to Sonora, California. Its crest varies in width from a ...

  7. Giant's Causeway - Wikipedia

    en.wikipedia.org/wiki/Giant's_Causeway

    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.

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