MUSEUM OF COMPARATIVE ZOOLOGY. 83 
of the Southington plain is obtained ; it is broadly drift-covered. No 
interruption in the ridge is discovered for a mile and a half ; then near 
the outlet of Southington reservoir (2) two small notches are found, in- 
dicating dislocations with heave of seventy and eighty feet ; these are 
probably connected with the indentations in the main ridge to the 
northeast, which bear about N. 50° E. from the notches. Another mile 
without interruption brings us to the Shuttle Meadow fault, Fig. 3 be- 
ing repeated in Fig. 13; the bluff of the northern member of the an- 
terior should be followed around its edge into the fault valley in order 
to appreciate the regularity of its curve. Three small dislocations ap- 
pear in the North High Rock block, next beyond ; and near the third one, 
fragments of vesicular trap are found in the shaly beds in the road (3). 
Advancing a little farther, an oblique valley (4) between North and 
South High Rocks is disclosed ; if it is located on a fault, and if the 
fault belong to the prevailing system, a dislocation in the anterior ridge 
should be found when we have gone far enough southward to give the 
oblique valley a bearing of about N. 60° E., and the dislocation should 
be of the Shuttle Meadow pattern. At the expected point, the anterior 
bluff curves around and ends in a ravine (5), across which another bluff 
of the same form begins at a little higher level, indicating an uplift of 
say a hundred feet. The oblique valley between the High Rocks cannot 
be distinguished until the ravine is followed up towards the road ; then 
its bearing is found to be closely parallel to that of the faults near by. 
The impure limestone that is found at a number of points in the region 
on the back of the anterior is exposed in an old quarry close by on the 
roadside. 
If the vague conception of the Triassic structure with which Shuttle 
Meadow was entered on the second day’s walk be now recalled and com- 
pared with the definite conception that has slowly grown up as the to- 
pography has been deciphered and the structure interpreted from it, the 
student will find that the alternative hypothesis of repeated sequences 
of deposition has no longer any claim on his attention. The hypothesis 
of repetition by faulting has found continued confirmation since it was 
first tested at Shuttle Meadow. Every method devised for testing the 
occurrence of faults has been applied, and no doubt whatever can re- 
main of their occurrence. The members of the repeated sequence are 
sufficient in number to make a good case, and succeed one another too 
arbitrarily to be regarded as products of a single process ; repetition is 
frequent, and when once perceived it becomes a prominent characteristic 
of the region; the faults by which the repetition is produced are strik- 
