22 ANNUAL REPORT OF THE 



laboratory and field, of Messrs. S. C. Lawrence and Edward 

 Wigglesworth in Course 4, Dr. F. H. Lahee in Course 5, and Mr. 

 Sedgwick Smith in Course 8. Mr. R. E. Sawyer acted as extra 

 assistant in Geology 4. In Radcliffe College Professor Wood- 

 worth gave courses 4, 5, 8, and 20c, the latter course being given 

 by special request. 



The teaching collections in the geological laboratory were 

 augmented during the year by suites needed to fill out gaps in 

 the historical series. Mr. G. M. Flint collected rocks and fossils 

 from the Cretaceous and Carboniferous in New Jersey and Penn- 

 sylvania during the April recess. Professor Woodworth conducted 

 an excursion to the Gay Head cliffs. Professor Woodworth 

 devoted considerable time to the preparation of his report on the 

 Shaler Memorial Expedition to Brazil and Chile, and to the work 

 of the Seismographic Station. 



On July 1st Professor Woodworth, accompanied by Mr. Edward 

 Wigglesworth as Assistant in Geology, proceeded to Bozeman, 

 Montana, from which point was conducted the Rocky Mountain 

 Summer Course in geology for Hve weeks, with an attendance of 

 eight students. The route traversed covered the geology of the 

 Madison canon near Norris, the Madison terraces, Old Baldy Mt. 

 at the head of Alder Gulch, the placer workings below Virginia 

 City, and the geological structure of the Sphinx Mt. region in the 

 Madison range. Mr. Sedgwick Smith spent ten weeks in field 

 work on the structure of the region between the Madison and 

 Ruby ranges, and Mr. R. E. Somers spent five weeks on the basalts 

 and structure of Alder Gulch. Both were enrolled in Course S20c. 



A report on the surface geology of the Portland quadrangle, Me., 

 prepared by Mr. Ralph E. Sawyer, is ready for publication. 



Professor Woodworth, at the close of the Summer School, in- 

 spected the seismological station at the University of California, 

 and went thence via Los Angeles to the Grand Canon of the 

 Colorado and so to Oklahoma, where an examination was made of 

 the reported occurrence of glacial erratics in the Carboniferous 

 Caney shales, from which a collection of the striated stones was 

 made. The striations were found to be caused by interstitial rock 

 motion. 



Assistant Professor Johnson gave courses A, 6, 10, and, in co- 

 operation with Professor Davis, Course 20a. In the Summer 

 School he offered a course in physiographic field work in connection 

 with the Shaler Memorial Investigation; this was elected by three 

 students who also acted as Assistants in the investigation ; in the 



