234 THE EARTHQUAKE OF MARCH 21, 1904, 



Too fe>v data are available for much discussion of the geo- 

 logical aspects of the earthquake ; but enough are at hand to 

 indicate a few points of interest. Further consideration must 

 await the accumulation of information from a larger number of 

 sources. 



(1) The variations of time are to be accounted for by the 

 differences between the two standard times, between the stand- 

 ard and local times, or errors of time-pieces. The correct time 

 is 1.04 to 1.05 a. m., eastern standard, or 2.04 to 2.05 a. m., 

 maritime time. 



(2) The shock appears to have consisted of two periods of 

 disturbance, of perhaps ten seconds, separated by five seconds 

 interval ; but there may have been some little variation in differ- 

 ent places. 



(3) The sh ock travelled from west to east, roughly. This 

 is not only away from the region of greatest intensity, in the 

 United States, but is parallel to the general strike of the geo- 

 logical formations in Nova Scotia affected. 



(4) It was felt with special severity along the line of the 

 triassic estuary. 



(5) It was more effective along the strike than across it. 

 It was felt on the south coast, and again on the north side of 

 the gold-bearing series for a long distance ; while there is no 

 information of its occurrence in the inland zone between. 



(6) Its intensity apparently decreased eastward. 



(7) There appears to be a close relation between intensity 

 and the presence of intrusives. The zone of greatest disturb- 

 ance is a long and very narrow east and west belt, from Yar- 

 mouth to about Kentville. This zone is occupied largely by 

 triassic sediments, and bounded on the south by the plateau 

 composed of siluro-devonian and gold-bearing strata, prob- 

 ably pre-eambrian. On the north is the triassic trap of North 

 Mountain ; and the old rocks to tbe south have, near the 



