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The area included in the Geological Survey's map of the Fair­ banks quadrangle is delimited by meridians 146 and 150 and paral­ lels 66 and 64. The Fairbanks gold-placer district is in the eastern part of this area. During the season of 1908 a Survey party Was engaged in making a detailed geologic map of the Fairbanks district and during 1909 geologic investigations were carried north of the Fairbanks district and westward to Rampart. The results of these trips, together with those of previous trips, are being assembled for a geologic map of the entire quadrangle. A portion of the quad­ rangle, including the Fairbanks district and extensive areas to the north and west, is shown on the accompanying geologic sketch map (PL VI). From the presence of the Fairbanks district in the south­ eastern part of the area covered by this sketch map and of the Birch Creek district extending into the northeastern part of it the atten­ tion of prospectors has frequently been directed toward this area as a favorable one for prospecting. Although no other rich placers have yet been discovered than those of the Fairbanks and Birch Creek districts, there are outside of these well-known areas several widely separated localities at which auriferous gravels have been found and some attempts are being made to mine these deposits. There is also a small amount of quartz prospecting in progress. The following preliminary report is designed to state briefly only what appear to be the main geographic and geologic facts regarding this area northwest of the Fairbanks district and west of the Birch Creek district, and to emphasize especially the contrast between the highly metamorphosed rocks of the eastern and southeastern portions of the area and the less metamorphosed rocks of the northwestern portion, and also the distribution of the granitic rocks. These features are particularly worthy of attention from the view­ point of the prospector from the fact that the gold-producing dis­ tricts of Birch Creek and Fairbanks lie in the schists characterizing

Mineral resources of Alaska, report on progress of investigations in 1909--Sketch of the geology of the northeastern part of the Fairbanks quadrangle