THE 



AMERICAiN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Art. XXy. — Post-Glacial War ping of Newfoundland 

 and Nova Scotia; by Regi^s^ald A. Daly, Harvard 

 University. 



COXTEXTS. 



Introduction. 



Methods of determining amount of emergence. 



Observed amounts of emergence. 



Conditions at St. John's, iSTewfoundland. 



Glacial striae in Newfoundland and southeastern Labrador. 



Weakness of giaciation in eastern Xewfoundland. 



Eecent drowning of southern Xewfoundland and of southern Nova Scotia. 



Causes of the drowning. 



Introduction. — The sensitiveness of the earth's crust 

 to widely distributed loads seems to be proved by the 

 systematic behavior of the crust after the partial or 

 complete melting of large ice-caps. In every case the 

 unloading has been followed by the uplift of the central 

 part of the deglaciated surface. Examples are seen in 

 Scandinavia, the British Isles, northeastern North Amer- 

 ica, British Columbia, Greenland, Spitzbergen, and Ant- 

 arctica. For dynamical geology the physical meaning 

 of the law is even more important than the discovery of 

 the fact. Glacial loading of the crust and its unloading 

 by deglaciation are analogous to actual experiments in 

 testing the kind of response made by the material of the 

 earth's interior to slowly applied stresses. The study of 

 post-Glacial warping in the formerly glaciated regions 

 has, therefore, significance for geodynamics in general. 

 Explanation of the warping involves questions as to com- 

 pressibility, elasticity of form, and the kinds of viscosity 

 characterizing the inner shells of the earth. In particu- 

 lar, the relative importance of viscous flow and of elastic 

 after-working should, if possible, be determined in the 



Am. Jour. Sci.— Fifth Series, Vol. I, No. 5. — May, 1921. 

 36 



