REPORT OF THE SECRETARY - 45 



chief point of interest was the Chispas mine, near.Arispe, where Doc- 

 tor Foshag procured a series of the mafinificent silver minerals found 

 there. During several daj^s spent at Bisbee, Ariz., in collecting min- 

 erals and examining material offered for sale, some very interesting 

 specimens were added to the collections. In cooperation with the 

 mineralogical nniseum of Harvard Universitj, and accompanied by 

 a representative of that institution, Doctor Foshag spent three months 

 collecting minerals and examining mineral deposits in the States of 

 Guanajuato, Zacatecas, Durango, and Chihuahua, Mexico. A consid- 

 erable amount of excellent exhibition and study material was ob- 

 tained, including groups of large gypsum crystals, a fine series of 

 lead and zinc minerals, and complete sets of ores and rocks from all 

 of the important mining districts visited. These will be used as the 

 basis of a report on these districts. 



Drs. C. E. Resser and R. S. Bassler spent two months in the Rocky 

 Mountain region in a reexamination of certain Canadian sections for 

 stratigraphic details necessary for the completion of Doctor Walcott's 

 unfinished manuscript summarizing the knowledge gained in his 

 years of extensive research. The area examined was covered by 

 motor and the researches were at various times greatly facilitated by 

 the cooperation of other geologists familiar with local sections. The 

 territory covered included the Wasatch Mountains, Yellowstone Na- 

 tional Park and the mountains immediately north, and the area along 

 Newland Creek, Meagher Count}^, Mont. Stops were also made in the 

 Little Belt Mountains. The main objective of the summer's work, 

 however, was the general region of the Bow Yalley, Canadian Rocky 

 Mountains, north and west of Banff, Alberta, and certain other locali- 

 ties well known from Doctor Walcott's investigations. 



In cooperation with the Milwaukee Public Museum, Dr. Erwin 

 Pohl continued a detailed study of the little laiown but highly im- 

 portant stratigraphy of the Middle Paleozoic of the mid-Eastern and 

 Central States. The researches of the season covered portions of 

 eastern Wisconsin, southern Michigan, northern Ohio, and southern 

 Ontario. Nearly- 2 tons of selected and beautifully preserved fossils 

 resulted from the trip. 



Dr. Joseph A. Cushman, collaborator in paleontology, spent the 

 greater part of the summer of 1927 in a field trip through various 

 countries of western Europe primarily to secure collections of fossil 

 foraminifera from classic areas. He was highly successful in his 

 work, and as a result, large numbers of types will come to. the Museum 

 upon the completion of his studies. 



Late in the fiscal year Mr. Gilmore was detailed for an expedition 

 in the Two Medicine formation in Montana to search for dinosaur 

 and other vertebrate remains, Avith Mr. George F. Sternberg, who 

 has had long and varied experience in fossil collecting, as his assist- 



