OLENELLUS ZONE IN THE NOETH-WEST HIGHLANDS, 



233 



Beginning with the basal quartzites (from 200 to 300 feet in thick- 

 ness) they preserve the same character along the whole line. They 

 consist of flaggy false-bedded grits and quartzites, with occasional 



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partings of shale, which are destitute of those worm-casts so charac- 

 teristic of the overlying zone. One exception seems to have been found 

 to this apparent absence of organic life. In the course of last season 



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