476 WILLIAM HERBERT HO BBS 



branches to any given direction is very closely the direction 

 N. 5° W., as shown by the upper course (in the diagram) of the 

 trunk stream, as well as by the upper course of Jack Brook, its 

 main eastern tributary, and by the small intermediate branch of 

 the latter. These three channels are not only evenly spaced, 

 but to the southward their extensions correspond in position 

 with the southerly trending elements of great elbows of the Hou- 

 satonic (see Plate II). After receiving the waters of Jack Brook, 

 the Shepaug flows for nearly three miles in the direction S. ±: 

 15° W. (N. ±15° E.), another of the four prevailing fault direc- 

 tions observed in the Pomperaug Valley. Later it flows S. ± 

 34° E. (N. ± 34° W), while several tributaries flow along this 

 direction and S. =b 55^ W. (N. ±55° E.) , the two remaining of 

 the four prevalent fault directions of the Pomperaug Valley. 



TJie oriented drainage ivit/mi the area surroundi?tg tlie Pomperaug 

 Valley. — In the map of Plate II, a larger area, of which the 

 Pomperaug Valley is the center, has been considered. Upon 

 this map, traced from the United States Geological Survey atlas 

 sheets, which are on a scale of one inch to the mile, the full 

 straight lines represent observed faults (extended), and the 

 dotted lines the inferred approximate position of faults. It has, 

 of course, been necessary to omit all but a few of the numerous 

 faults which were observed in the Pomperaug Valley area. The 

 figures on the margin of the map indicate the directions (in 

 degrees) either to the east or west of north of the trough or 

 fault lines which emerge near them. With the greater com- 

 plexity of this map and the larger number of fault directions 

 represented, relationships are not at once so apparent as in Fig. 

 2, which upon a reduced scale is here included. Special atten- 

 tion is directed, however, to the fact that the Housatonic itself, 

 which after flowing about three miles in a direction S. ±: 5° E. 

 (N.± 5° W.), assumes the directions. ± 61° E. (N. ± 61° W.) 

 at first in a nearly straight channel for three miles, and then in a 

 zigzag course for eight miles more. Many interesting peculiari- 

 ties will be noticed in the orientation of the smaller streams 

 shown upon this map; as, for example, along the N. ± 55° E. 



