File:Monzonite (Early Eocene, 50-54 Ma; Bearpaw Mountains, Montana, USA) 1 (49061260742).jpg

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Monzonite from the Eocene of Montana, USA.

Monzonite is an intrusive igneous rock composed of potassium feldspar and plagioclase feldspar, but with little to no quartz (less than 5%). Mafic minerals, such as pyroxene, biotite mica, and amphibole are usually present in minor amounts.

Age: Ypresian Stage, Early Eocene, 50-54 Ma

Locality: small quarry adjacent to Beaver Creek Road (= Route 234), 1.4 miles south of the boundary of Rocky Boy's Indian Reservation & 8.1 miles south of the Beaver Creek Road-Sucker Creek Road intersection, Bearpaw Mountains, southeastern Hill County, northern Montana, USA
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Source Monzonite (Early Eocene, 50-54 Ma; Bearpaw Mountains, Montana, USA) 1
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@N05/49061260742 (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 20193,526 × 1,503 (4.59 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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