QUAHTZITE PEBBLES WITH OBOLL 385 



While, therefore, the suggestion that the pre-Carboniferous pebbles 

 may be o£ late Cambrian age seems to be the only one possible at present, 

 the very slender basis npon which this suggestion rests should not be left 

 out of view.^ 



^ The origin of these fossiliferous quartzite pebbles, as well as the question of their age, has been 

 discussed by Mr Wood worth in his part of this monograph. It seems from Dr. Foerste's presentation 

 of the matter that no considerable importance can be attached to the suggestion that these pebbles 

 are derived from the Natick or other known quartzites which occur in the basm. — H^, S. S. 



MON XXXIII ^25 



