52 
GEOLOGY OF THE THIRD DISTRICT. 
at the lead mines, one is N.W., and the other varies from E. ^ E.N.E. to E. h E.S.E.; at 
Copenhagen, one is N.E., and the other N.W. Two of the joints are nearly at right angles 
to each other, a third is oblique to the two, and one of the three is often absent. 
The Trenton limestone is an important rock to show the ancient level of all the points 
where its surface now appears, extending without interruption from East Canada creek to the 
St. Lawrence river. Its calcareous composition shows that it was a precipitate; the shale 
with which its layers so often alternate, prove that it was deposited in tranquil waters, and 
its flat layers confirm the original horizontal position of its surface. 
5 , 
View of the Falls below the Foot-bridge, from a Drawing of R. C. Taylor. 
The character of the Trenton limestone as a rock, showing its horizontal layers as they 
appear transverse to the stream, and its well-characterized vertical joints, is well exhibited 
in the wood-cut No. 5, taken at one of the falls of Trenton, on West Canada creek. The 
most interesting locality of the Trenton limestone is on this creek. For about two miles, 
the creek has cut a passage through the limestone; the sides of the excavation rising verti¬ 
cally, with an average height of over one hundred feet. In this passage are the falls or cas¬ 
cades which have given so much celebrity to the place, justly meriting by their number, 
beauty and position, the admiration which they have received. Including the one at Prospect 
village, there are six falls, five of which are placed at intervals somewhat regular, and occupy 
the middle part of this time-wrought excavation. The layers generally thoughout this dis¬ 
tance, with the exception of the grey variety which forms the upper part of the mass, rarely 
