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Fisher Caldera, also known as Mount Fisher and Fisher Volcano, is a large volcanic 
caldera
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...
, measuring about by , located on Unimak Island in the Aleutian Islands
The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi language, Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a cha ...
of Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...
. Formed by the destructive eruption of an andesitic stratovolcano
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and per ...
about 9,100 years ago, it contains three crater lakes, one wide and two others about wide. Small peaks rising and are also present in the caldera. Fisher Caldera is located just from the Mount Westdahl
Westdahl Peak, also known as Westdahl Volcano or Mount Westdahl, is a stratovolcano of the Aleutian Range, in the U.S. state of Alaska. The volcano last erupted from November 29, 1991 to January 15, 1992.
volcano.
The largest volcanic eruption on Earth during the Holocene
The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togethe ...
Epoch
In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.
The moment of epoch is usually decided by ...
(the last 11,700 years) occurred at Fisher Caldera in 8700 BCE.
References
External links
*See also
* List of volcanic craters in Alaska * List of volcanoes in the United States Volcanoes of Alaska Unimak Island Volcanoes of Aleutians East Borough, Alaska VEI-6 volcanoes Calderas of Alaska Stratovolcanoes of the United States Holocene calderas {{AleutiansEastAK-geo-stub