THE RIVER SYSTEM OF CONNECTICUT 481 



line ^3, along which are arranged stretches of the West, the 

 Quinnipiac with its tributary the Ten-Mile, the Fa,rmington with 

 its tributary the Pequabuck (for about fifteen miles), and a minor 

 branch of the Farmington, which enters at its last great bend. 

 This line, except near New Haven, is some distance east of the 

 curving western boundary of the Newark area of the Connecticut 

 valley. 



The only important fault line observed to hold to the direc- 

 tion of the N. dz 20° E. faults, which is marked /on the map, 

 follows the Quinnipiac for about fifteen miles and continued 

 northward coincides with the course of the Connecticut for a dis- 

 tance of about six miles. 



Following the direction N. ±l 33° E. are the trough lines e ^, 

 ^2' ^3' ^4' ^5' ^^^ ^6' ^^^ latter less marked than the others, and 

 ^^ being an important observed fault in the Pomperaug Valley 

 area. The line e^ follows for a distance of fifteen miles or more, 

 the middle course of the Housatonic ; e^ is nearly in line with 

 the Croton and the Aspetuck rivers ; while e^ is outlined by the 

 Pine River and the small branch of the Connecticut, which is 

 continuous with the southwesterly flowing elbow of that river at 

 jViiddletown. The line e^ shows no striking correspondences on 

 a map of this scale, though midway between it and e^ the Sal- 

 mon River, a branch of the Connecticut, for about seven miles 

 follows the direction closely. 



The trough lines of the N.±5° W. series {b^,b^, b^, etc.), 

 while not prominently marked by the courses of any great 

 streams, save for short distances by the Housatonic, the Nauga- 

 tuck, and the Connecticut, yet all show on a larger scale map in 

 the minor stream branches many interesting correspondences. 

 As this direction agrees more or less closely with the slope of 

 the Cretaceous plain of erosion of southern New England, the 

 failure of the strong streams to follow this direction is worthy 

 of note. 



Though less marked than some of the other series, the 

 trough lines which trend N.dz90° E. W. seem to be clearly 

 outlined, especially h^, which passes through the divide of the 



