File:Granodiorite (Tobacco Root Batholith, Late Cretaceous, 71-74 Ma; Norris South roadcut, Madison County, Montana, USA) 1 (45628087201).jpg

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Granodiorite from the Cretaceous of Montana, USA.

Granodiorite is a coarsely crystalline-texured, intrusive igneous rock similar to granite in mineral composition. Compared with true granite, granodiorite has less potassium feldspar and more plagioclase feldspar.

Geologic unit & age: eastern margin of the Tobacco Root Batholith, early Maastrichtian to late Campanian, late Late Cretaceous, 71 to 74 Ma

Locality: roadcut on the eastern side of Route 287, Burnt Creek-Bradley Creek Valley, south of the town of Norris, northern Madison County, southwestern Montana, USA (45° 31' 29.67" North latitude, 111° 41' 50.54" West longitude)
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Source Granodiorite (Tobacco Root Batholith, Late Cretaceous, 71-74 Ma; Norris South roadcut, Madison County, 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@N05/45628087201 (archive). It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 November 2018

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current04:41, 6 November 2018Thumbnail for version as of 04:41, 6 November 20183,426 × 2,509 (7.29 MB)Lu Brito (talk | contribs)Transferred from Flickr via #flickr2commons

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