Excerpt from Preliminary Report on the Copper-Bearing Rocks of Douglas County, Wisconsin This examination was made between the 17th of May and the 2oth of June. The remainder Of the season, until the last Of August, was spent on the northern district. But during this time a visit was made, for the purpose of comparative study, to the copper-mining region Of Keweenaw point. The method followed in the season's field work was to visit all parts of the two areas above mentioned which were known to have rock outcrops, or in which outcrops might be reasonably expected. In such parts north and south traverses were made at intervals of one-half mile, or more frequently when occasion demanded. Thus, in the region where outcrops occur fro quently, the north and south section lines, the north and south quarter section lines and some Of the east and west section lines were followed. The larger streams, and in fact all the streams which might be expected to cut down to the bed rock, were also followed. The outcrops seen were located carefully by pacing, and the position Of each was indicated as so many paces north and so many paces west Of the southeast corner Of the given section. In this manner Of locating paces equals one mile. Rock samples were taken from most Of these outcrops. In all about 775 rock numbers and a considerably greater num ber Of specimens were collected. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.