370 DESCRIPTION OF T H E 



character in the lower beds. One hundred and ninety-two feet below the top of 

 the ridge, the brecciated conglomerate is intercalated with beds of siliceous shale, 

 and underlaid by altered sandstone. The conglomerate is seventy-one feet thick. 

 At the points where the irregular shape of the pebbles and fragments, and the 

 paucity of cementing material, allowed a cavity to remain, the sides are incrusted 

 with zeolites and calcite. 



The metamorphosed slate on this stream is of a light red colour, variegated with 

 exceedingly thin laminae of blue and orange. The lines of deposition are most dis- 

 tinctly marked, over fifty of them occurring sometimes in the depth of an inch. 

 Large yellow spots and stripes are also of frequent occurrence ; the spots, which 

 are round or oval, penetrating the bed perpendicularly, like those so common in 

 some of the red sandstone beds of the south shore of the Lake. Some of the beds 

 contain segregations of quartz, and thin veins of thalite. 



The dip of these beds is southeast, varying to south-southeast, at an angle of 

 from 18° to 21°. 



Nos. 8, 9, 10, and 11 of the above section are not to be seen on the stream, but 

 are a continuation of the section carried from the point where the rocks cease to be 

 seen in descending the river, across the line of bearing, to the points which project 

 into the Lake on either side of the bay, and where they are well exposed. 



The point below the mouth of this river is formed by No. 630, bearing north 30° 

 east. It continues to line the shore to the mouth of Cariboo River. 



13. Cariboo River. — On the lake-shore, above the mouth of this river, the over- 

 lying trap contains immense rounded masses of basaltic rock, some of them as much 

 as twenty feet in diameter, with concentric layers. In some of the mural walls 

 these globiform masses have weathered out, leaving large round cavities. The dif- 

 ference, if any, between these masses and the rock in which they are contained, I 

 am not prepared to state. 



The section on Cariboo River,* in descending order, is as follows : — 



1. Red clay and marl. 



2. Basaltic rock. 



3. Volcanic grit, with globular masses of basaltic rock interspersed through it. 



4. Corrugated or wrinkled beds. 



5. Volcanic grit — amygdaloidal. 



6. Metamorphosed sandstone. 



7. Metamorphosed sandstone — the lower beds pebbly. 



8. Conglomerate — intercalated with shaly layers; very ferruginous; some of the rounded rocks are a 

 foot in diameter. 



9. Shales, with beds of conglomerate. 



10. Basaltic rock. 



11. Volcanic grit. 



12. Amygdaloidal volcanic grit. 



The general dip is to the southeast, varying to east-southeast, at an angle of from 

 10° to 19°. 



* See PI. 1, N, Sec. 7. 



