108 C. D. WALCOTT — OUTLOOK OF THE GEOLOGIST IN AMERICA 



Diller resumed the study of Crater lake, Oregon, and made a geologic 

 reconnoissance in the Klamath mountains. 



Becker made detailed studies of the Mother lode of California with 

 special reference to the manner in which the gold was deposited. Lind- 

 gren continued the study of auriferous gravel channels of the Sierra 

 Nevada and attacked also certain physiographic problems. Merriam 

 began the systematic collection of fossils from the gravels, and traversed 

 Mesozoic areas at the north for the collection of fossils. Branner made 

 an areal geologic survey of coastal ranges in San Mateo, Santa Cruz, and 

 Santa Clara counties. Diller made local surveys in Shasta county and 

 the Honey Lake region. Eldridge investigated the distribution and con- 

 ditions of the occurrence of petroleum, and Hershey studied the geology 

 and physiography of the Klamath mountains. 



In Alaska, Schrader studied the section along the 151st meridian from 

 the Koyukuk river to the Arctic ocean. Mendenhall made a reconnois- 

 sance from the Koyukuk to Kotzebue sound via the Koyuk river. Col- 

 lier was engaged in areal mapping in the northwestern part of Seward 

 peninsula. Brooks was engaged in areal mapping and a study of the 

 ore deposits of the Ketchikan mining district. 



In Cuba, Hayes, Vaughan, and Spencer made a geologic reconnois- 

 sance with special reference to a study of the economic resources of the 

 island. 



Economic work. — In economic, geology — that department of applied 

 geology which pertains to minerals of recognized economic value — the 

 year's work shows also a wide range. Geologic problems in relation to 

 the occurrence of coal were studied in various parts of Pennsylvania, in 

 western Maryland, in northern Kentucky and in North Dakota. The 

 problems of petroleum and natural gas received attention in Pennsyl- 

 vania, Ohio, Michigan, Kansas, Wyoming, Texas, Louisiana, Arkansas, 

 and California. Problems of the precious metals were investigated in 

 Colorado, Montana, California, and Arizona ; of copper in Arizona, Mich- 

 igan, and Wisconsin, and of lead and zinc in Kansas and Missouri. The 

 geology of iron was studied in Wisconsin and Minnesota ; the geology of 

 artesian waters in New Jersey, Iowa, and North Dakota. Water resources 

 for irrigation and power were investigated in the east from Maine to Ala- 

 bama, in the central Mississippi River region, and in all the more westerly 

 states and territories. Mineral waters received special attention in 

 Indiana. Clays were studied from the economic standpoint in Mary- 

 land, Iowa, Tennessee, Mississippi, and New Jersey. The relation of clays 

 and other rocks to the cement industry in Ohio and Michigan was inves- 

 tigated, and special investigations of materials available for road con- 

 struction were made in Wisconsin and Missouri. 



