The study of epeirogenic movements by means of critical surveys of raised beaches is one for which North America is a peculiarly rich field. The investigations of Gilbert in Lake Bonneville, of Upham in Lake Agassiz, and of Gilbert, Spencer, Leverett, Taylor, Fairchild, Coleman, Woodworth, and others in the Great Lakes region have contributed greatly to the understanding of post-glacial upwarpings. Among the many papers which have been written on this subject, one is unique in that it seeks to correlate observations over all eastern North America. This is the paper read before the Boston Society of Natural History in 1892 by Baron Gerard De Geer.2
This distinguished visitor, fresh from studies of the upwarped marine strands of Scandinavia, applied himself at once to the task of correlating the measurements of raised beaches which had been made in New England, the maritime provinces, the Great Lakes region and the . . .