Image: Square butte

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Description: Northwest view of Square Butte, a laccolith in the Adel Mountains Volcanic Field in west-central Montana. From: Stephen S. Harlan, Lawrence W. Snee, Mitchell W. Reynolds, Harald H. Mehnert, R.G. Schmidt, Steve D. Sheriff, and Anthony J. Irving. "40Ar/39Ar and K-Ar Geochronology and Tectonic Significance of the Upper Cretaceous Adel Mountain Volcanics and Spatially Associated Tertiary Igneous Rocks, Northwestern Montana." Professional Paper 1696. U.S. Department of the Interior, U.S. Geological Survey. Reston, Virginia: 2005
Title: Square butte
Credit: http://pubs.usgs.gov/pp/2005/1696/pdf/PP1696.pdf
Author: U.S. Geological Survey
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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Adel Mountains Volcanic Field

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