MUSEUM OF COMPARATIVE ZOOLOGY. 85 



in Fig. 14, indicates an uplift on the northwest ; it is probably there- 

 fore an extension or a branch of the fault just described north of Short 

 Mountain. 



The southern boundary of the Short Mountain block presents nothing 

 unusual, for both the anterior (8) and the main sheets (9) of the next 

 block — West Peak — are offset normally to the eastward about a third 

 of a mile. The course of the fault determined by sighting from the 

 south end of the anterior of Short Mountain block to the north end of 

 the West Peak main sheet is about N. 60° E. An old " paint mine " 

 (10) lies on this line ; the heap of refuse about it consists of a b..eccia of 

 vesicular and dense trap cemented by barytes and other minerals. The 

 sartie line, carried several miles northeastward, runs to a normal dislo- 

 cation in a trap ridge (probably a second posterior) a little distance 

 southwest of Berlin Junction station ; shortly before reaching this dis- 

 location, a "clay dike" (Geol. Conn., 378) is seen in the banka of the 

 Mattabesick ; its position places it on the fault line ; its direction, about 

 N. 40° E., accords fairly with that of the fault ; its structure shows it 

 to be a breccia ; and the deformation in the bedding on either side, 

 Fig. 15, shows that its heave and throw agree with the rule of the re- 

 gion. Midway on the same line, where the road from Cat Hole to New 

 Britain crosses a stream by an old burnt mill between two ponds, the 

 posterior trap is exposed in the stream channel, and close west of the 

 road there is a four-foot breccia of trap and sandstone, bearing N. 50° 

 E., with a hade of 15° northwest of the vertical, and slight uplift on the 

 east as indicated by apparent repetition of the scoriaceous upper por- 

 tion of the trap. This is probably a small fault, associated with the one 

 that bounds Short Mountain on the southeast. 



There are no other significant faults till the. Reservoir Notch ig 

 reached ; and the day's walk may be ended either by following the road 

 (11), Fig. 11, that runs around the curve of West Peak, or by a shorter 

 cut (12) leading through Cat Hole to Meriden. 



Review. 



All the chief faults from Cook's Gap to Higby Mountain — ten in 

 number — have now been worked out. They accord fairly well" in di- 

 rection, as appears in the general map, Fig. 16, corresponding to the 

 black square of Fig. 1. Here the several sketch maps, Figs. 2, 3, 10, 

 11, and 13, are outlined in their proper relative positions, and indicated 



