REPORT OF THE DIRECTOR IQlJ 45 



area was covered by him, including Ontario, Quebec, from Lake 

 Nipissing to Gaspe, New Brunswick, Nova Scotia, Maine, New 

 Hampshire, and a review of the Connecticut valley north of Green- 

 field, Mass. 



With precision, or at least fair approximation, the amount of 

 glacial depression of the land and postglacial uplift was determined 

 at over 60 stations. The deltas built in the sea-level waters by 

 south-leading streams were used as the main criteria. The result is 

 given in a map of isobases, or lines of equal uplift, which shows the 

 amount of land rise and the area affected. It is found that the 

 center of the doming uplift is in Quebec, between James bay and 

 Quebec city, with a rise of over 1000 feet. It also appears that 

 Newfoundland was the locus of a distinct ice cap and area of land 

 oscillation. 



The detailed description of this study is published in the Bulletin 

 of the Geological Society of America, volume 29; with abstracts in 

 Science and in the Proceedings of the National Academy of Sciences. 

 The glacial survey of the Catskill mountains. Dr John L. Rich 

 has been engaged for two years in the study of the glacial phenomena 

 of the south and southwestern Catskills with the plan of continuing 

 this work to its completion. Doctor Rich has now been commissioned 

 as captain in the War Intelligence Office, and this service will doubt- 

 less interfere with the progress of this undertaking during the term 

 of the war. Captain Rich has reported the following with reference 

 to his last year's work. 



Reconnaissance mapping was carried southward along the south- 

 eastern base of the Catskills and the valley of Rondout creek as 

 far as Summitville, where strong terminal moraines and out wash 

 plains mark the position of an important stand of the ice. 



The eastern base of the Catskills from High Point to Summitville 

 is marked by numerous marginal drainage channels, sand plains and 

 hanging deltas. At Napanoch is a large hanging delta built by a 

 stream which flowed from Esopus valley through Peek-o-Moose 

 gulf at the time the ice was banked high up on the eastern front of 

 the range at High Point and a lake, with discharges at Summ'.tville, 

 was held up in the Rondout valley. These conditions furnish data 

 for the determination of the slope of the ice tongue in the Hudson 

 valley at the time the delta was building. 



An examination of the northwestern end of the northeastern 

 range of the Catskills revealed the fact that a very heavy moraine is 

 banked against the range near Broome Center, and that after the 



