41)4 W. H. HOBBS LINEAMENTS OF ATLANTIC BOREER REGION 



some possible Caledonian tracts, only two tectonic elements which show the essen- 

 tial characteristics of d and f [d the Armorican folds, /being the western Hebrides 

 and a small part of the peninsula of western Scotland. — Ed.]. They are separated 

 by Belle Isle straits and the lower course of the Saint Lawrence river. To the 

 north lies the broad Laurentian-Archean mass — the Canadian shield — and prob- 

 ably extends broadly toward the pole beneath the horizontal Paleozoic sediments 

 of the Arctic American archipelago; also extending across to Greenland. South 

 of the same, in the rias coasts of Newfoundland, Nova Scotia, and New Brunswick, 

 appears a region of folded rocks with discordant transgressing Upper Carbonif- 

 erous, which is as plainly the western continuation of a great folded chain as in 

 Europe the Armorican ridges are the east end of such a chain." 



It is, perhaps, well here to repeat that these lineaments, represented 

 on the map as straight lines, are found to be complex so soon as ob- 

 served on maps of larger scale, where they appear, as has been said, as 

 lines of zigzags, and hence they are to be regarded as zones which on 

 the scale of the map may be regarded as narrow. They are represented 

 as lines only, because on the scale of the map the breadth of the zone is 

 nearly or quite inappreciable. When, therefore, in the descriptions of 

 the lineaments the statement is made that this or that line is continued 

 as such or such a lineament, it should be understood that the narrow 

 zone is thus extended and not any particular line within that zone. 



THE NORTHWEST-SOUTHEAST SERIES 



Saint Croix line. — Not only do the maps disclose the existence of a 

 series of lineaments and of crustal slices which trend parallel to the coast 

 line of the Carolinas, but series directed nearly at right angles are hardly 

 less in evidence. In the Connecticut area (plate 46) the direction 

 north 34 degrees west was indicated as the more characteristic of faults 

 along this general direction in the special area of the Pomperaug valley. 

 With it, however, were observed dislocations of a series trending north 

 44 degrees west. The river system of the state as a whole shows, how- 

 ever, with some clearness that the latter series is in that larger province 

 the dominant one. Examination of the rivers of the Atlantic border 

 region, as we shall see, furnish evidence that dislocations approximating 

 to the northwest southeast direction have controlled. Without attempt- 

 ing to refer to all lineaments which are there indicated, a few deserve 

 special consideration. Beginning at the northeast, a line of the series 

 follows the southwestern shore of Nova Scotia so as to terminate the trap 

 walls, and at the same time the Newark basin of that province. Farther 

 southeast upon the peninsula this line passes between masses of igneous 

 rock in a way which may indicate offsetting. The course of this inter- 

 esting lineament has been represented by figure 2. 



