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 breccia of 
vesicular and dense trap cemented by barytes and other minerals. The 
same 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 banks 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 is 
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 
