264 Joseph Barrell. 



become one of the classics in geology, Pirsson says of it 

 in this Jonrnal: " The special character of the work 

 lies in the detailed investigation of the bathylithic body, 

 of the method of its intrusion, of its form, and of its 

 relations to the surrounding rock masses both past and 

 present. ' ' The intrusion Barrell could not explain by the 

 accepted methods, and did so by a new theory, that of 

 magmatic stoping. Daly, in his book "Igneous Rocks 

 and their Origin," states that "It was in the Cordil- 

 leran region, at. Marysville, Montana, that Barrell in- 

 dependently invented the stoping theory of magmatic 

 emplacement. ' ' 



Because of the large scale on which the Marysville 

 and Boulder bathyliths are exposed, and because of the 

 forceful presentation of the field relations and the clear- 

 ness of Barrell's inferences therefrom, Suess in his great 

 work, "The Face of the Earth," was led to say that 

 the Marysville report is "one of the most instructive 

 works produced in modern times" connecting granitic 

 invasions with volcanoes. 



The interesting and popularly written pamphlet, 

 "Central Connecticut in the Geologic Past," visualizes 

 the major events in the geologic history of the state. 

 It is illustrated by a series of eight highly instructive 

 structure sections drawn by Barrell himself. These 

 sections show clearly Barrell's faculty for picturing his 

 thoughts ; not infrequently he would express an idea in 

 graphic form before he put it in writing. 



Erosion, Sedimentation, and Climatology. 



The writer of this biography joined the Geological 

 Department of Yale University in 1904, and at that time 

 became acquainted with Barrell, then an assistant pro- 

 fessor. As both of us had our offices in the Peabody 

 Museum, we saw much of each other, and often our dis- 

 cussions had to do with sedimentation. I would relate 

 to him the varied phenomena which I had seen in the 

 field and the distribution of the formations, and he would 

 try to decipher their processes of accumulation. Then 

 in 1905, after I had listened to his course of about twelve 

 lectures, I urged him to publish his views, especially 

 as to the depth of water and the climate suggested by 

 the nature of the sediments. In the following year he 



