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Saddle Mountain (Clatsop County, Oregon) : ウィキペディア英語版 | Saddle Mountain (Clatsop County, Oregon)
Saddle Mountain is the tallest mountain in Clatsop County in the U.S. state of Oregon.〔 Part of the Oregon Coast Range, Saddle Mountain is in Saddle Mountain State Natural Area in the northwest corner of Oregon. The peak is listed on Oregon’s Register of Natural Heritage Resources.〔(【引用サイトリンク】title=State Register of Natural Heritage Resources )〕 == Geology ==
Saddle Mountain was created around 15 million years ago in the Pliocene epoch when lava flows poured down the old Columbia River valley. When the lava encountered the water at the Astoria Sea, great steam explosions and thermal shocks occurred to create a large pile of basalt rocks. The mountain consists of this volcanic breccia, which is a rock made up of broken basalt fragments that are fused together in a fine-grained matrix.〔 (【引用サイトリンク】 The Volcanoes of Lewis & Clark )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Saddle Mountain (Clatsop County, Oregon)」の詳細全文を読む
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