File:Phonolite (Early Eocene, 50-54 Ma; roadcut along Beaver Creek Road, Bearpaw Mountains, Montana, USA) 2 (49058605337).jpg

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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 Ma

Locality: 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
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Source Phonolite (Early Eocene, 50-54 Ma; roadcut along Beaver Creek Road, Bearpaw Mountains, Montana, USA) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49058605337 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current02:05, 6 December 2019Thumbnail for version as of 02:05, 6 December 20193,203 × 2,106 (4.45 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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