95 
Miles and 
Kilometres. 
83 m. A local pebble beach of the Saxicava sea cau- 
133 km. ses a slight topographic change. Exposures of 
limestone are passed on either hand, and North 
Nation river is crossed. 
84 m. The road follows the north bank of the river, 
134.5 km. skirting a cliff of granite-gneiss, with which 
are associated a few minor bands of limestone. 
85 m. On both sides of the road Ottawa gneiss of 
136 km. granitic character is exposed. At the turn and 
rise in the road a binary granite is seen on the 
left, which obstructs Nation river, causing a fall, 
the power from which is utilised by a hydro-elec- 
tric station. After leaving the exposures of 
granite-gneiss at the top of the hill the road 
follows a band of Leda clay, through which 
granite is occasionally exposed at distances of 
one fourth to one half of a mile (.4 to .8 
km.) from the road. 
86 m. A biotite-tourmaline-granite, typical of the 
137.6 km. area extending from Nation river to St. André 
Avelin, is here exposed. 
88.6 m. A few exposures of impure, banded limestone 
141.8 km. are observable near St. André Avelin. 
89 m. Re-crossing North Nation river, the road 
142.4 km. follows its east bank, in which Leda clay is 
92m. sometimes exposed beneath a thin capping of 
147.5 km. Saxicava sand. This continues until Céte St. 
Pierre is reached. 
THE EOZOON OCCURRENCE AT COTE ST. PIERRE. 
GEOLOGICAL RELATIONSHIPS. 
In this classic locality the Pre-Cambrian formations 
are obscured to an unfortunate degree by Leda clay and 
sand. Two Pre-Cambrian rock-types are present : impure 
Grenville limestone, and a younger intrusive of plutonic 
habit, that ranges in composition from biotite-hypersthene- 
gabbro to quartz-syenite. The contact between the two 
is characterized by certain important contact metamorphic 
phenomena. Several N.W.—S.E. faults find topographic 
expression in the small area included by the map. It 
would appear from these that either the limestone block had 
