PROGRESS OF SURVEYS. 3 
Cook Inlet. — G. C. Martin also made a reconnassiance of a part of the Matanuska coal 
field, lying 30 miles northeast of Cook Inlet. His report is in preparation, but the more 
important conclusions bearing on the economic geology are incorporated in this volume. 
Southwestern Alaska. — Incidental to his other field work Sidney Paige spent a few days at 
Herendeen Bay examining some of its coal fields and submits the accompanying report. 
Seward Peninsula. — Fred H. Moffit and Frank L. Hess mapped the areal geology of about 
half of the area covered by the Nome and Grand Central special maps. The geology was 
found to be unusually'intricate, and this fact, together with the detailed studies of the aurif- 
erous gravels, made the progress of mapping very slow. A supplementary study of some of 
the tin deposits of the York region was made by Mr. Hess, and the results are here presented. 
T. G. Gerdine, assisted by W. B. Corse and B. A. Yoder, made a topographic survey 
(1:45,000) of 470 square miles in the Solomon and Casadepaga regions. 
Yukon-Tanana region. — Geologic reconnaissance mapping was continued in the Yukon- 
Tanana field by L. M. Prindle, assisted by Adolph Knopf. The work was carried from the 
international boundary, near the head of Sixtymile River, south and west to Fairbanks. 
D. C. Witherspoon, assisted by R. B. Oliver, mapped on a scale of 1 : 250,000, 4,300 square 
miles in a region lying between Circle, Fairbanks, and Fort Hamlin. It is believed that the 
topographic reconnaissance mapping of this field can be completed in two more seasons. 
