GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 307 



lines are V and S. The shortest line connecting its remotest extremities is 1300 feet 

 long; but if we measure tlie length of the ledge as it lies, 300 feet must be added. 

 There are loops at each end which bend in opposite directions from each other. Tlie 

 greatest width of this fragment is about eighty feet. On the west side of this frag- 

 ment, near the easterly end, there goes forth a branch perhaps connecting with several 

 narrow fragments still further away. We have first an exposure between V — 12 and 13 ; 

 600 feet north-easterly, by the side of the road, is another narrow band, flanked on the 

 east by dolomite, which is only 250 feet north from the nearest angle of the looped and 

 twisted area near Aldrich's house. In the field north of the road are at least two other 

 exposures of narrow dimensions, which I have followed more than fifty rods. It may 

 extend still further : I have not traversed the region further in search of it. 



There is another exposure midw^ay between U and T — 14, 200 feet 

 north from the west end of the large fragment with the double hook, 

 which is probably a part of the range. If we take this isolated fragment, 

 and add to it another over 300 feet long lying between T — 15 and 16, we 

 shall have more than half enough material to fill in the 600-feet gap be- 

 tween the double hook range and the next one to the west. Should we 

 straighten out this westerly fragment, and then put in these two pieces, 

 there would be enough to join the larger fragments together by a curve. 

 I cannot otherwise understand the existence of the mass between T — 15 

 and 16 than by supposing it to have been forced out of the vacant space 

 just mentioned. Accepting such a conclusion, it will be seen on inspect- 

 ing the map that this piece has been thrown very singularly out of its 

 place. The forces that should so derange the continuity of the forma- 

 tion are almost inconceivable. 



The piece coming next in order is the largest yet encountered, lying 

 between T — 15 and Q — 18, 1760 feet in length by the shortest line, and 

 1900 feet when measured along its centre. The general course is about 

 east and west, but the eastern extremity, for about 500 feet distance, 

 courses about N. 20° E. This end is 100 feet wide ; the other is twice 

 that width for 700 feet. It is this fragment that has furnished pebbles 

 of jasper. The jasper I have seen in a ledge about a mile distant in a 

 northerly direction, and that may have been the source whence these 

 constituent pebbles came. 



The next fragment of conglomerate illustrates clearly our theory of 

 breaks and throws. It is a mass 700 by 400 feet, with the course N. 35° 

 E., whose northern end is 400 feet remote from the nearest corner of the 



