THE K ATM A I REGION, ALASKA 



571 



cesses leading to the eruption were at work except that near the 

 summit of the Pass the party experienced several earthquake 

 shocks. Spurr's record' is of much value, however, for the infor- 

 mation it gives on the general character of the country. Their 

 route lay through the midst of the area that was subsequently 

 devastated. Further reference to this report will be made later. 



Fig. I. — Sketch map of the Katmai region. By courtesy of the National 

 Geographic Society. 



In the Katmai country and its vicinity the volcanic mountains 

 occupy a comparatively narrow strip of territory approximately 

 parallel with the coast line, bounded on both the northwest and 

 southeast sides by areas of predominantly sedimentary rocks. 

 These sedimentary areas exhibit many forms of mountainous 



'J. E. Spurr, "A Reconnaissance in Southwestern Alaska in 1898," Twentieth 

 Annual Report, U.S. Geological Survey (1898-99), Part VII, pp. 31-264. 



