they follow closely as if they were moulded on them. Sometimes 
between the quartzite and limestone, there is a conglomerate 
formed mainly of fragments of quartzites cemented by calcareous 
matter( 1 ), from one foot in thickness to three and even ten feet 
in thickness. No fossils have been found yet in that conglomer- 
ate, which seems to represent the Calcareous and Chazy formations. 
Then the first fifteen feet of limestone represent the Black river 
subdivision of the state of New York, and the last fifteen feet 
forming the upper part of the cliff, north of the bridge, belong to 
the Lower Trenton proper. The strata are horizontal. The 
quartzite is seen in the bed of the river, and in a small island 
above the bridge ; the water flows over it and leaps at one bound 
to the foot of the precipice. The whole water-fall is made by the 
quartzite. Those quartzites are generally whitish-gray, stratified 
in beds of ten to fifteen feet thick, above the fall ; at other places, 
they are only one to three feet of thickness. No fossils have 
been found in them yet ; so it is impossible to classify them. 
Lithologically they have great similarity with the quartzites of 
the Potsdam sandstone of Keeseville in New York ; but they may 
be much older. The dipping is east-south under an angle of 
80 to 85 degrees, almost perpendicular ; and the strike is north 
45° east, to south 45° west. 
At the end of a very dry summer, August 30, 1863, at my last 
visit to the Montmorency fall, the water of the river was very 
low, and I was able to explore every part of the foot of the fall. 
The section is represented fig. No. 1 ; and the fig. No. 2 is the 
section at the same place by Mr. Selwyn, Director of the geologi- 
cal survey of Canada. The water falls into a small basin formed 
in the quartzites. The depth of the basin is about fifteen feet, 
with some fragments of rounded rocks at the bottom, fallen from 
the top of the fall. The width of the basin is twelve feet ; then 
there is an outcrop of quartzites about fifteen feet of thickness, 
the strata of quartzites varying between one foot and three feet 
of thickness ; the stream of the river flows round and over that 
outcrop of quartzites ; then we have a small basin of water three 
or four feet in width in the slates and beyond that small basin 
(!) L’Abb6 J. Cl. K. Laflamme, in his excellent paper, “Note sur le contact des- 
' formations palaeozoiques etarch6ennes dela province de Quebec” (Mem. Soc. E. Can, 
ada , Section iv, 1886, pp. 43-47) gives facts, and opinions of great value; but which 
unhappily, were overlooked by the geological survey of Canada. 
