21 
DESCRIPTION OF SECTIONS STUDIED 
The Stewart quarry at Rockland lies about 2 miles south 
of the Ottawa river just beyond Rockland. The exposure is con- 
tinuous and one face of the quarry is a perpendicular precipice 
which includes strata ranging from the Lowville beds of the 
Black River into the lower Trenton. The strata have a slight 
dip to the southeast but lie quite conformably. 
The corresponding section at Ottawa is found about 3 
miles east of the city on the first road east of the Robillard 
quarry running north to the river from the Montreal road. 
It does not show a continuous section of any one of the forma- 
tions, but the contact between the Lowville and the Leray beds 
of the Black River is exposed. Like the beds in the Rockland 
quarry, the strata have a slight general dip to the southeast, 
which is increased in some of the Trenton layers by small local 
faults. 
MacLaren landing is on low ground, but about a quarter of 
a mile south of it an escarpment rises. A quarter of a mile to the 
west of the road leading up from the landing the hill encroaches 
on the low land reaching down to the river shore. The exposures 
show in a series of terraces extending from the shore-line to the 
crest of the ridge about a third of a mile inland. Several parts 
of the section which form the sloping top of a terrace are covered 
with drift, notably the long sloping pasture field extending from 
the TetradiUm beds of the Lowville to the top exposures of the 
Chazy limestone. 
The general dip of the whole section is, as at Ottawa and 
Rockland, inclined towards the south and slightly east, but the 
Chazy beds are much more disturbed than the beds above. It 
is evident that the fault in the Chazy, which is very pronounced 
at Quyon on the Quebec side of the Ottawa, extends to the 
Ontario side, continuing its course obliquely across the river. 
The disturbance on the Ontario side is not so marked nor does 
it affect so great a thickness of beds as at Quyon. The greatest 
irregularity of dip takes place in the limestone beds just above 
the interbedded shale and limestone strata of the old quarry 
mentioned below. The Chazy beds above are less distorted. 
Another fault on the face of the hill, in the Chazy beds, is at 
