OTHER LINEAMENTS 



499 



projected eastward along the same direction passes near the northern 

 shore of Long island (see lines a and b of plate 45). The direction of 

 these lineaments is about north 65 degrees east. 



Mohawk- Deei 'field line. — Another dominant line, and, so far as is appar- 

 ent from inspection of the map, not parallel to any similar lineament, is 

 that which I have denominated the Mohawk-Deerfield line (0). This 

 strong lineament outlines the great central valley of New York state, 

 separating the Hudson River rocks to the north from the newer sedi- 

 ments upon the south. Continued westward it runs parallel to the long 

 axis of Oneida lake, while eastward from the Hud- 

 son its general course corresponds closely to the 

 gorge of the Deerfield river, along which the Fitch- 

 burg railroad has found a way across the uplands. 

 In the vicinity of the Connecticut river it is a fall 

 line, on which are located Shelburne and Turners 

 falls, and it terminates the basalt flows of the New- 

 ark, where they turn to follow this direction for a 

 short distance (see figure 3). The Connecticut 

 here makes a sharp turn to the east, and is en- 

 tered from the east by Millers river, whose course 

 follows the same direction. Still farther east the 

 line approximates the southern shore of Massachu- 

 setts bay. The bearing of this lineament is about 

 north 75 degrees west for its whole distance, but 

 more nearly north 85 degrees west in the section 

 immediately adjacent to the Connecticut river. 



Holyoke line. — Any geologist who has examined 

 the map of the Newark area of the Connecticut val- 

 ley must have been impressed by the fact that the 

 much-faulted Holyoke range meets the main di- 

 rection of the flow of the district almost at right 

 angles, or in a nearly east-and-west direction. Em- 

 erson has shown that a line of volcanic plugs 

 marking the course of a fissure line in the crust extends in a direction 

 parallel to the range and a little south of it (see figure 3). Both to the 

 east and to the west from this line of plugs the Connecticut receives trib- 

 utaries along the direction of the fissure. Extended west, this line coin- 

 cides with the great westwardly offset of the Housatonic, which has been 

 recognized as the course of a fault by both Emerson and the writer (see 

 figure 4). Westward in central New York this east-west lineament is 

 parallel to but not quite coincident with a long T-like branching of the 



Figure 4. — Course of the 

 Housatonic River in the Vi- 

 cinity of the Great Bend at 

 Lee, Massachusetts. 



LXIV— Bull. Geol. Soc. Am., Vol. 15, 1903 



