MUSEUM OF COMPARATIVE ZOOLOGY. 15 



REPORT OF THE STURGIS HOOPER PROFESSOR OF 



GEOLOGY. 



By Reginald A. Daly. 



Apart from the time devoted to teaching and the duties of a 

 department chairman, the year was spent in laboratory and field 

 research. Two papers on the hypothesis of a recent, eustatic shift 

 of sea-level to the amount of about twenty feet, another on the 

 systematic warping of the earth's crust in the belts marginal to 

 the Pleistocene ice-caps, and a fourth on the relation of the plane- 

 tesimal hypothesis to the earth's history and constitution were 

 written and published. Laboratory studies on the 1919 collection 

 of Samoan rocks and on the chemical precipitation of limestone 

 were begun. A special investigation of recently published theories 

 of mountain-building was also begun. 



During the summer a field revision of data bearing on the post- 

 Glacial warping of the Atlantic coast region was made. De Geer's 

 measurement of uplift at Mount Desert, Maine, was confirmed. 

 It was found that the zero isobase crosses the Nova Scotia coast 

 between Yarmouth and Digby and runs across northern Nova 

 Scotia to a point on the Strait of Northumberland, north of Pictou. 

 It lies between Port-aux-Basques and St. George's Bay in south- 

 western Newfoundland, and between Cape Bonavista and Twil- 

 lingate in eastern Newfoundland. As a result of deceptive field 

 appearances and of hasty field work at Signal Hill in 1900, the 

 writer published the statement that St. John's was uplifted (see 

 Bull. M. C. Z., 1902, 38, p. 258). This assertion is quite wrong, 

 all the coast around the city showing evidence of recent subsidence. 

 Many points studied both on the east and west shores of New- 

 foundland as well as on the Canadian and Newfoundland Labrador 

 coast showed that the island has been tilted toward the south, 

 with maximum uplift of 425 to 450 feet at its northern extremity. 

 The 1900 measurement of uplift at and near Battle Harbor, 

 Labrador, was confirmed. 



