Descriptive Geology of Nevada South of the Fortieth Parallel and Adjacent Portions of California (Classic Reprint) - Softcover

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Excerpt from Descriptive Geology of Nevada South of the Fortieth Parallel and Adjacent Portions of California

The primary Object Of the expedition was to make the roughest kind of a general geologic map, such as might fill up the great gaps in the map Of the western United States. It being the intention of the Sur vey to publish a general geologic map Of the United States on a scale of. About 40 miles to the inch, no great amount of detail was advisable or possible. On account, also, of the rough and inaccurate manner in which much of the region Of the western United States has been already mapped, it was not advisable to undertake to do any work of higher grade.

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