NORTHWEST-SOUTHEAST SERIES 



495 



On the mainland this course follows, as a narrow zone of parallel lines, 

 the course of the Saint Croix river, so as to terminate abruptly or to indi- 

 cate offsets in the boundaries of the members of the stratigraphic series 



Figure 2. — Map of the Saint Croix Line of Displacement {after Dawson's Map). 



represented along it, especially, however, in the igneous rocks, the Upper 

 Silurian, and the Devonian. 



Lower Connecticut line. — Of the lineaments of this series which have 

 been represented on the drainage map of Connecticut (see plate 46) only 



