E 
55 
) 
interstratified, especially in the lower part of the section, with 
a bright red, slaty rock, which is somewhat contorted ; and in 
the upper part of the section with the agglomerate, which is 
chiefly composed of quite small, but mostly angular fragments 
of melaphyr. These beds, which are very distinctly stratified 
throughout, strike about N. 80° E., dip S. 15°, and are overlain 
conformably by the melaphyr ; but the lower contact is not ex- 
posed. On the west they are quite certainly cut off by a fault, and 
this, as shown on the map, is probably also their fate on the east. 
At any rate, the melaphyr clearly crosses their strike in this direc- 
tion, and it is impossible to trace them for more than three hun- 
dred fect. A red slate or tuff similar to that found here, crops 
out just west of the Rockland House, accompanied, apparently, 
by agglomerate, although this may be only the ordinary con- 
glomerate or puddingstone. The correlation of these red out- 
crops would require us to postulate dislocations which are not 
indicated on the map and for which there is no independent 
evidence. It appears wiser, therefore, to regard them as local 
and non-synchronous accumulations of volcanic dust and lapilli. 
The melaphyr immediately northeast of the Rockland House 
is gimilar to that оп Atlantic Hill, and is undoubtedly a con- 
tinuation of it; and the same is true of the melaphyr forming 
Gun Rock and its neighboring ledges. The beds of tuff on the 
north side of Atlantic Hill cannot be traced west of the abrupt 
western slope of the hill, perhaps for want of outcrops ; nor can 
they be followed eastward more than half way across Centre 
Hill. But in this direction the various flows of melaphyr are, 
apparently, united ; and in the Gun Rock district there is not a 
trace of any sedimentary rock, but the true conglomerate and 
the fragmental lava or tuff are alike wanting. It would be 
'asy, of course, to explain the absence of the tuffs by faulting, 
but it is, perhaps, more probable that these fragmental lavas 
were never spread over this area. The submerged or half-tide 
ledge east of Gun Rock (see map) is about three hundred feet 
long at low tide, and consists wholly of melaphyr similar to 
that of Gun Rock. 
There is, apparently, no reason to doubt that all the mela- 
