Volcanic Necks at Anderson's Inlet. 169 



having a general north-westerly one. Two examples of each can 

 be seen branching away from the periphery of the neck, but 

 their mutual relations cannot be determined. 



The third, represented by a well-pronounced fault, not visibly 

 connected with the neck, has an almost east and west bearing, 

 and has caused a visible dislocation of the strata, but to what 

 extent could not be ascertained. 



As far as can be gathered from the evidence of the first two 

 series of faults there has been a general throw of from a few 

 inches to a few feet to the west. This seems to indicate that the 

 intrusion of the volcanic mass has caused a westward push on 

 that side of the neck, dislocating the strata, and setting up 

 simultaneous or subsequent formation of the larger faults of both 

 series. The smaller ones were probably caused by the settling of 

 the masses after their initial and greater movement. 



On the eastern side of the neck there are three distinct and 

 sharply-defined extensions of the volcanic material forming steps, 

 as it were, in the margin of the neck. They probably indicate 

 the points of origin of faults having a general easterly bearing, 

 and similar in character to those in the west. That they do 

 represent faults, however, is not evident, since the strata here — 

 massive, jointed sandstones — quite prevent definite evidence 

 being obtained. 



With the exception perhaps of a marginal displacement of 2 or 

 3 inches at the most, and confined to the periphery or there- 

 abouts, that is dying out in the neck itself, there does not appear 

 to have been any displacement of the volcanic material after its 

 injection and solidification. All the definite larger faults, with 

 the one exception, have apparently radiated from a common 

 centre, that of the neck itself, and are directly attributable to 

 volcanic agency. 



Continuing the examination of the beach eastward from Neck 

 1, it is seen that there is a series of almost parallel breaks in the 

 sandstones. These are now marked by narrow channels or rifts, 

 varying in breadth from 2 or 3 inches to 6 feet. They may 

 represent lines of fault, or perhaps only lines of jointing, eroded 

 by sea action. In two cases, however, there is evidence of 

 definite faulting, one of them having a throw of 6 feet, and N.W. 

 bearing. Little beyond the general ]:)earing of the faults can be 



