Mount Sidley

The Mount Sidley is an extinct shield volcano northeast of Mount Waesche, and with 4181 m the highest mountain in Marie Byrd Land in Antarctica.

The volcano is an extensive, mostly snow -capped mountain and the highest and most impressive of the five extinct volcanoes that form the Executive Committee Range. The summit is marked by a spectacular caldera, a trough- shaped caldera.

The mountain was discovered by the polar explorer Richard Evelyn Byrd, an admiral in the U.S. Navy, during a flight by plane on 18 November 1934. The volcano is named after Mabelle E. Sidley, the daughter of William Horlick, a manufacturer and funders an Antarctic expedition Byrds in 1933-1935.

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