Phonolite (Early Eocene, 50-54 Ma; roadcut along Beaver Creek Road, Bearpaw Mountains, Montana, USA) 2 : 無料・フリー素材/写真
Phonolite (Early Eocene, 50-54 Ma; roadcut along Beaver Creek Road, Bearpaw Mountains, Montana, USA) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Phonolite from the Eocene of Montana, USA.Phonolite is a highly alkaline, intermediate to mafic, finely-crystalline, extrusive igneous rock - it is a scarce type of volcanic lava. This sample has augite pyroxene, olivine, analcime, and leucite. The light-colored areas are zeolite-filled vesicles. The zeolites here are thompsonite and phillipsite.Age: Ypresian Stage, Early Eocene, 50-54 MaLocality: roadcut & cliff along Beaver Creek Road (= Route 234), 1.2 miles south of Eagle Rock & 2.9 miles north of the Beaver Creek Road-Sucker Creek Road intersection & 4.5 miles south of the northern boundary of Beaver Creek County Park & 16.5 miles south of Havre, Bearpaw Mountains, southeastern Hill County, northern Montana, USA |
| 撮影日 | 2019-11-12 12:29:33 |
| 撮影者 | James St. John |
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