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SCIENCE. 



[N. S. Vol. XX. No. 499. 



cial geology of the United States will be 

 studied by Professor T. C. Chamberlin, who 

 will have the assistance of Messrs. E. D. Salis- 

 bury, W. W. Atwood, F. H. H. Calhoun, Frank 

 Leverett, W. C. Alden and F. W. Taylor. 

 The glacial areas in the Rocky Mountain 

 region will be carefully investigated by Pro- 

 fessor Salisbury, assisted by Messrs. Atwood 

 and Calhoun. A monograph on the Pleisto- 

 cene formations of the lower peninsula of 

 Michigan and adjacent portions of Indiana 

 will be cdmpleted by Mr. Leverett. Mr. Alden 

 will map portions of southeastern Wisconsin 

 for folio publication. 



The pre-Cambrian and metamorphie geology 

 of the United States will be studied under the 

 direction of Professor C. E. Van Hise, who 

 will also complete his report on the geology of 

 the Lake Superior region. In this work he 

 will be assisted by Messrs. C. K. Leith and 

 W. N. Smith. He is also directed to con- 

 tinue investigation of the metamorphie iron- 

 ore deposits of the United States, particularly 

 those of the Eocky Mountain and Great Basin 

 region. 



Other general investigations covering sev- 

 eral states will be conducted by Mr. E. C. 

 Eckel. He will complete a study of the 

 cement industry of the United States and 

 prepare a report in which special attention 

 will be paid to the geologic and economic re- 

 lations of the industry. Mr. Eckel will also 

 complete an investigation of the slate industry 

 of the United States, directing the work of 

 Professor A. H. Purdue in Arkansas and Pro- 

 fessor T. N. Dale in Virginia, West Virginia, 

 Maryland, Pennsylvania, Maine and Vermont. 



The Mississippi Valley. — Several states will 

 be included in an investigation to be made by 

 Mr. H. Foster Bain of the lead and zinc de- 

 posits of the Mississippi Valley. He will 

 make a special study of their genesis, geologic 

 occurrence and economic importance. His 

 specific task is to examine the lead and zinc 

 deposits of the upper Mississippi district in 

 Illinois, Iowa and Wisconsin and to prepare 

 a preliminary report upon this district. In 

 addition he will examine certain copper de- 

 posits in Shannon County, Missouri, associ- 

 ated lead and zinc ores in St. Genevieve 



County and in the Mine Lamotte district, and 

 the St. Clair and Granby mines in south- 

 western Missouri. He is also directed to re- 

 examine the more important lead and zinc 

 mines of the western Kentucky district and to 

 make a reconnaissance examination of the lead 

 and zinc district of the Appalachian Valley 

 in Virginia and Tennessee. Mr. E. O. Ulrich, 

 who is directed to investigate the Silurian and 

 Ordovician paleontology and stratigraphy of 

 the northern Mississippi valley, will cooperate 

 with Mr. Bain in the study of the lead and 

 zinc deposits of that district. 



Alabama. — An areal and economic survey 

 of the Brookwood quadrangle, Alabama, will 

 be made by Mr. Charles Butts, who will be 

 assisted by Mr. Hoyt S. Gale. They will 

 probably also begin work upon the Jasper 

 quadrangle, Alabama. 



Arhansas. — Professor A. H. Purdue will 

 make an areal and economic survey of the 

 Winslow quadrangle, Arkansas. If time per- 

 mits, he will also make an economic investiga- 

 tion of the developed slate deposits of Ar- 

 kansas. 



California. — The areal geology of the Red- 

 ding quadrangle, California, will be revised by 

 Mr. J. S. Diller. He will also complete an 

 areal and economic survey of the Indian Val- 

 ley Special quadrangle, California. 



Mr. Arthur C. Spencer will cooperate with 

 Mr. Waldemar Lindgren in making an in- 

 vestigation of the economic geology of the 

 Redding quadrangle, California. 



An areal and economic survey of the Tejon 

 quadrangle, in southern California, will be 

 made by Mr. George H. Eldridge. He will 

 also make, for correlation purposes, the neces- 

 sary reconnaissance examinations of regions 

 adjacent to this quadrangle. 



The areal and economic survey of the Santa 

 Cruz quadrangle, California, will be com- 

 pleted by Dr. J. F. Newsom, who will be 

 assisted by Dr. Ralph Arnold. 



Dr. G. K. Gilbert will continue his investi- 

 gations of the glaciology and physiography 

 of the High Sierras. 



Colorado. — Under the direction of Dr. Whit- 

 man Cross, detailed areal mapping will be con- 

 tinued in the San Juan region of Colorado. 



