Publisher's Synopsis
Excerpt from Petrography and Geology of the Igneous Rocks of the Highwood Mountains, Montana
In the following work will be found the results of field and labora tory studies of the igneous rocks of the Highwood Mountains of Mon tana. The field work was carried out by Mr. Walter H. Weed and the writer, chie?y during the latter part of the summer of 1894, though the eastern part of the area was again revisited for a few days in 1896. The north-central part of the area, around the Shonkin and Arnoux stocks, was not visited by the writer, as this part of the work was done by Mr. Weed after the writer was called from the field. As the field work in petrology was incidental to the areal mapping of the region on the base map of 4 miles to the inch for the Fort Benton folio of the United States Geological Survey, under charge of Mr. Weed, the time that could be devoted to a careful study of details was necessarily limited. Future studies of the district may therefore bring out minor features which were not seen or which are but brie?y treated.
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