See ne a et eR. nr . 
C. G. Rockwood, Jr.—American Earthquakes. 481 
These do not indicate with any certainty a progressive motion 
from any centre. Assuming the shock, therefore, to have been 
practically simultaneous at these stations, the mean of these 
iimes, or 14 7™ 18°, would be the time of the beginning of the 
earthquake as nearly as it can be ascertained. 
he directions reported at fifty-nine stations were plotted 
and examined, They are as follows: 
Northwest and southeast 
North and south 19 
Northeast and southwest 19 
ast and west 14 
The only inference that can be drawn from this statement is 
that the propagation was in a northeast-southwest direction or 
the reverse, since the number of northwest-southeast observa- 
ons is notably less than the others. An examination of the 
s 
forming the Palisades, on the west bank of the lower Hudson, 
and which is continued southward in Bergen Hill to its end in 
Staten Island. Nor is the presence of these trap dykes the 
the lowest part of ‘the grand 6 mines chain, which reaches 
much greater elevations in the 
