140 The American Geologist. March isoo 
been intruded along lines of weakness, cracks, etc. If they have 
come from great depths, along so extended a coast line, and of 
such narrow widths, it is certainly a striking phenomenon. 
Or if there is a parent mass at no great depth, which, however, 
has in this same extended area failed in any greater amount to 
show itself, it is not less striking. It may be that the parent 
mass, if there is one, is now covered by the sea. The prevail- 
ing northeasterly trend of the dikes is parallel to the general 
axis of folding along the eastern coast, and they may some- 
how be connected with it. Dr. Hobbs, in speaking of the 
Somerville dike further south, mentions that it (we may add, 
and perhaps these to the north) have some connections with 
the extended intrusions of Triassic diabase, so frequent from 
Nova Scotia to the Carolinas. The particular time and source 
of the dikes, however, must with our present knowledge be al- 
most entirely a matter of speculation. 
Geological Laboratory , Cornell University . • 
TRIASSIC TRAPS OF NOVA SCOTIA, WITH NOTES ON 
OTHER "INTRUSIVES" OF PICTOU AND ANTI- 
GONISH COUNTIES, N. S. 
By V. F. Maesters, Ithaca, N. Y. 
Of the numerous trap ridges and knobs which occur in Nova 
Scotia, perhaps the largest and most prominent is that 
known as the North mountains, on the southeast of the bay 
of Fundy. This ridge, extending with two or three exceptions 
in a nearly unbroken line from cape Split on the northern to 
Briar island on the southern extremity, rests upon Triassic 
sandstones. It has a length approximating 120 miles and a 
breadth, from the brow of the mountain to the water's edge, 
varying from one to five miles. While cape Blomidon attains 
an altitude of only 400 feet, the extreme bight of the range, 
which occurs in the section known as Marsters' mountain, is 
about 450 feet. The southeastern edge of the superimposed 
trap is quite thin, but it attains a considerable thickness 
toward the rock-bound coast as shown by the bight of the 
jagged trappean cliffs along the shore. The dip is about N. 
15° W.' The outliers occurring in the bay of Fundy and 
along the coast of Cumberland Co. are Partridge island, Five 
islands, cape Sharpe, and Haute island. All these, like the 
main deposit, overlie Triassic sandstone. The Triassic sand- 
' See Acadian Geology. 
