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A second example of ice-marginal lava flows can be found at Hoodoo Mountain, a flat-topped stratovolcano in British Columbia, Canada. [4] The volcano contains 50 to 200 m (160 to 660 ft) high cliffs that formed as a result of lava erupting subglacially in the last 100,000 years. As lava poured down the slope, the lava came into contact with ...
The two main types of lava field structures are defined as sheet flow lava and pillow lava. Sheet flow lava appears like a wrinkled or folded sheet, while pillow lava is bulbous, and often looks like a pile of pillows atop one another. [2] An important aspect of lava flow morphology is a phenomenon known as lava flow inflation. This occurs in ...
The word lava comes from Italian and is probably derived from the Latin word labes, which means a fall or slide. [2] [3] An early use of the word in connection with extrusion of magma from below the surface is found in a short account of the 1737 eruption of Vesuvius, written by Francesco Serao, who described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of ...
An example is the massive Level Mountain shield volcano in northern British Columbia, Canada, which covers an area of 1,800 km 2 (690 sq mi) and a volume of 860 km 3 (210 cu mi). [ 1 ] Perhaps the most extensive of all the subaerial basaltic plateaus existed during the Paleogene [ 2 ] and possibly extended over 1,800,000 km 2 (690,000 sq mi) of ...
It consists mainly of tuffs but also contains conglomerates and lava sheets. The formation can reach thicknesses exceeding 1,000 ft (300 m) [12] and is of late Pliocene age. An overlying rhyolitic lava flow gives an age of 1.5 million years. [13] Lassen is the fifth volcanic center to be active in the region. [14]
Fish Lake is an ephemeral lake that dries up during the summer season, formed by the damming of local water drainages by a lava flow from Sand Mountain Volcanic Field about 3,850 years ago. [11] Local topography has influenced eruptive activity in the past, directing lava flows downhill to the west and, with wind, directing tephra to the ...
Volcanics in the lower portion of this series of lava flows give a potassium-argon date of 750,000 years while volcanics slightly above the lava flows are 400,000 years old. The most recent volcanic activity produced a series of andesite and basaltic andesite lava flows down Pashleth Creek and the Machmell and Kingcome river valleys.
In volcanology, a pressure ridge or a tumulus (plural: tumuli), and rarely referred to as a schollendome, is sometimes created in an active lava flow. [1] Formation occurs when the outer edges and surfaces of the lava flow begin to harden. [1] If the advancing lava underneath becomes restricted it may push up on the hardened crust, tilting it ...